Academic Positions

  • Present 2015

    Professor

    From February 2009 till now.

  • 2009 2004

    Associate Professor

    From February 2004 to February 2009.

  • 2004 1998

    Assistant Professor

    From October 1998 to February 2004.

  • 1998 1994

    Lecturer Assistant

    From July 1994 to October 1998.

  • 1994 1990

    Demonstrator

    From December 1990 to July 1994.

Education

  • Ph.D. 1998

    Mechanical Power Engineering

    Mechanical Power Engineering Dept., Faculty of Eng., Zagazig University, Zagazig, EGYPT, September, 1998.


    Channel Ssystem:

    Virginia Polytechnique Institute & State University, Blacksburg, Virginia, USA.

    Dissertation title:

    ”Computation of Turbulent Flow and Heat Transfer in Rotating Non-Circular Ducts”.

  • M.Sc.1994

    Mechanical Power Engineering

    Thesis title:

    ”A Study of Boundary Layer Development over a Flat Plate in Conditions of Natural and Artificial Transition”.

  • B.Sc.1990

    Mechanical Power Engineering

    Faculty of Eng., Zagazig University, Zagazig, EGYPT, May 1990.

    Grade:

    Excellent with Honors.

Honors, Awards and Grants

  • 2014
    Certificate
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    Certificate from Mechanical Engineering Department, College of Engineering and Islamic Architecture, Umm Al-Qura University, Makkah, Saudi Arabia. The certificate is to recognize the efforts in the academic accreditation process (ABET), Fall Semester 2014.
  • April 2014
    Certificate
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    From Civil Defense Department, Ministry of Interior, Makkah, Saudi Arabia. The certificate is to recognize scientific activities in the field of "Simulation of Fire Dynamics", April 2014.
  • 2012-2013
    Certificate
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    From Mechanical Engineering Department, College of Engineering and Islamic Architecture, Umm Al-Qura University, Makkah, Saudi Arabia. The certificate is to recognize the efforts in developing Mechanical Engineering Department during the academic year 2012-2013, 31 December 2012.
  • 2009-2010
    Certificate
    image
    From Mechanical Engineering Department, College of Engineering and Islamic Architecture, Umm Al-Qura University, Makkah, Saudi Arabia. The certificate is to recognize the efforts in developing Mechanical Engineering Department during the academic year 2009-2010, 31 May 2010.
  • 1994
    Bronze Medal
    image
    From Egyptian Syndicate of Engineers, 1994.
  • 1990
    Silver Medal
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    From Egyptian Syndicate of Engineers, 1990.

Research Projects

  • image

    An Investigation of the Initiation

    King Abdulaziz City for Science and Technology, KACST", Saudi Arabia,

    Partner of a project that is supported by "King Abdulaziz City for Science and Technology, KACST", Saudi Arabia, Project Title: "An Investigation of the Initiation, Maintenance and Stability of the Halocline underlying the Operation of Solar Ponds: Application to the Construction and Operation of an Experimental Solar Pond", 12-MAT2969-10, May 2013-till now.

  • image

    Development of an Industry

    The Tempus Scheme from the European Union

    Member of a research team that is funded by the Tempus Scheme from the European Union. Project title is "Development of an Industry – Linked Mechatronics Program with Training of Trainers (DIMPTOT)". TEMPUS project (JEP – 33108 – 2005), (Finished my role in the project in December 2008).

  • image

    Computer-Based Expert System for Gas Reforming and Turbomachinery Utilities

    United States Agency for International Development (USAID)

    Member of a research team that received funding from the United States Agency for International Development (USAID) under the University Linkages Grant II. Project title is “Computer-Based Expert System for Gas Reforming and Turbomachinery Utilities - Operation and Preventive and Predictive Maintenance”, (Finished Sept. 1, 2002).

  • image

    Optimum Design of Hydrofoil Systems

    Office of Naval Research (ONR), USA.

    Member of a research team that is funded by Office of Naval Research (ONR), USA. Project title is "Optimum Design of Hydrofoil Systems". Virginia Polytechnic Institute and State University (Virginia Tech), USA, My role in the project was from July 1999 to September 1999.

  • image

    Nonlinear Active Control of Dynamic Systems

    Office of Naval Research (ONR), USA.

    Member of a research team that is funded by Office of Naval Research (ONR), USA. Project title is "Nonlinear Active Control of Dynamic Systems", MURI, Multi-University Research Initiative, Grant No. N00014-96-1-1123". Virginia Polytechnic Institute and Sate University (Virginia Tech), USA. My role in the project was from January 1997 to April 1998..

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Hands-on engineering education by construction and testing of models of sailing boats

Ahmed Farouk Abdel Gawad
Journal Paper American Journal of Aerospace Engineering. 01/2015; 2(1):11-30.

Abstract

This paper introduces involvement of the hands-on learning method. According to the modern environment of technology, engineering students have to realize the multidisciplinary nature of engineering systems. This learning technique is essential to offer students the necessary skills to master practical, organizational and work-group cleverness. The work is concerned with the redesign, construction and operation of two models of sailing boats. The approach of the work and final outputs are illustrated.

Computational investigation of aerodynamic

Ahmed Farouk Abdel Gawad, Eyad Amen Mohamed, Muhammad Naeem Radhwi
Journal Paper American Journal of Aerospace Engineering. 01/2015; 2(1):64-73.

Abstract

It is well-known that buses comprise an important part of mass transportation and that there are many types of buses. At present, the bus transportation is cheaper and easier to use than other means of transportation. However, buses have some disadvantages such as air pollution due to engine exhaust. This study is an attempt to reduce the gas emissions from buses by reducing the aerodynamic drag. Several ideas were applied to achieve this goal including slight modification of the outer shape of the bus. Thus, six different cases were investigated. A computational model was developed to conduct this study. It was found that reduction in aerodynamic drag up to 14% can be reached, which corresponds to 8.4 % reduction in fuel consumption. Also, Neuro-Fuzzy technique was used to predict the aerodynamic drag of the bus in different cases.

Performance evaluation of the tandem C4 blades for axial-flow compressors

Ahmed Farouk Abdel Gawad, Atef Mohamed Alm-Eldien, Gamal Hafaz, Mohamed Gaber Abd El Kreim
Journal Paper American Journal of Aerospace Engineering. 01/2015; 2(1):74-92.

Abstract

The purpose of this work is to study the aerodynamic performance of a tandem C4 base-profile compressor blade using numerical tools. In this paper, the flow along the tandem blade is studied for various relative blade positions. In all the studied cases, the front blade is fixed and the position of the rear blade is varied as a function of the axial and tangential displacements. A computer code was developed in "Visual Basic" using linear strength vortex-panel method to predict the aerodynamic performance of the tandem blade.

Proposed simple electro-mechanical automotive speed control system

Ahmed Farouk Abdel Gawad, Talal Saleh Mandourah
Journal Paper American Journal of Aerospace Engineering. 01/2015; 2(1):1-10.

Abstract

Millions of people are killed or seriously injured on the roads due to terrified accidents every year. Most of these accidents are attributed to the over-speeding of the road vehicles. Thus, the road speed limiter (RSL) is a very important technique to reduce the possibility of road accidents. An interesting idea to control the speed of the vehicle is to apply electronic control of the air-supply that enters the vehicle carburetor according to road transmitters that are connected and operated either by local network or satellite. In the present paper, a control system was designed and implemented. It is consisted of a control mechanism and an electronic circuit to control the air-inlet to the carburetor according to pre-set programming based on the vehicle speed. Although, it is a challenging job to design and implement modifications to existing systems, the present speed control system was successfully implemented and tested. The present proposed mechanism is simple, inexpensive and suitable to be implemented in developing countries where a big number of cars still work using the traditional carburetor mechanism.

Computational Investigation of the Operation of Heat Conservation Wheels in AHU-Systems

Ahmed Farouk Abdel Gawad, Asim M. Wafiah, Muhammad N. Radhwi
Journal PaperUmm Al-Qura University Journal of Engineering and Islamic Architecture (UQU-UJEA). 05/2014; 5(2).

Abstract

In certain facilities with concern to air-conditioning systems, a heat transfer process is to be applied for heat recovery of the disposing return-air from the patient's room without contamination. Therefore, much attention has been paid recently to the conservation wheels. Conservation wheel consists of a rotor with permeable storage mass fitted in a casing, which oper-ates intermittently between hot and cold fluids. The rotor is driven by a motor with relatively low speed so that the exhaust air and fresh air are alternately passed through each section. In this work, concen-tration is paid to the conservation wheel, which is the main component of the wheel air-conditioning system along with a parametric study to investigate the influence of the different parameters. A compu-tational model will be developed and validated by comparison to the results of others. The computa-tions are to be carried out using the commercial package ANSYS–Fluent, validation of the present com-putational model and technique was carried out successfully. Thus, present results can be taken with big confidence.

A Parametric Study of the Performance of Heat Recovery Wheels in HVAC System

Ahmed Farouk Abdel Gawad, Ghassan J. Softah, Muhammad N. Radhwi
Journal PaperUmm Al-Qura University Journal of Engineering and Islamic Architecture (UQU-UJEA). 05/2014; 5(2).

Abstract

The heat wheel is a key component in solid-energy systems that can be used in commercial building air-conditioning-systems in order to achieve energy savings. Rotary wheel-recovery consists of a rotor with permeable storage mass fitted in a casing that operates intermittently between hot and cold fluids. A unique advantage of rotary wheels is the capability of recover-ing sensible heat. At present, the analysis of the behavior of air handling units based on heat recovery wheels is a complex task to be done by a design engineer. In this work, a computa-tional study of heat recovery wheels is carried out for different operating conditions (inlet state, flow path, and wall material) to investigate the most effective parameters. The perfor-mance of the recovery wheel is evaluated by modeling a representative channel by a commer-cial software-package (ANSYS-Fluent). Thus, present results can be taken with big confidence.

New, Simple Blade-Pitch Control Mechanism for Small-Size, Horizontal-Axis Wind Turbines

Ahmed Farouk Abdel Gawad,
Journal PaperJournal of Power and Energy Engineering 12/2013; 7(12):2237-2248.

Abstract

In the present research work, the pitch-control is carried out such that the rotor blades are rotated around their longitudinal axis while the rotor continues its normal rotation. It is really a challenge to produce a clever design to pitch the rotor blades by the optimal amount so as to maximize the power output at all wind speeds. The mechanism is implemented to a three-blade, horizontal-axis, home-scale wind turbine. The mechanism is powered by a suitable DC (direct-current) motor. The tests were carried out in the open section of a delivery wind tunnel. The air speed was measured by a suitable anemometer. The corresponding rotational speed (rpm) and output voltage at different wind speeds were measured and recorded for calibration of the control system. The mechanism proved to be successful in controlling the pitch angle over a wide range of wind speeds.

Design and Optimization of a Multi-Stage Axial-Flow Compressor

Ahmed F. Abdel Gawad, Atef M. Alm-Eldien, Gamal Hafaz, Mohamed G. Abd El Kreim
Conference Paper Eleventh International Conference of Fluid Dynamics (ICFD11), 19-21 Dec., 2013, Helnan Palestine Hotel, Alexandria, Egypt; 12/2013

Abstract

The objective of this paper is to define a methodology for the design and analysis of multistage axial-flow compressors. A numerical methodology is adopted for optimizing the efficiency at the design point of a fifteen-stage axial-flow compressor with inlet guide vanes (IGV). The calculations are carried out along the mean streamline using the principals of thermodynamics and aerodynamics. A computer program was developed that simulates the compressor model. By specifying the geometry specifications (tip clearance, aspect ratio, thickness-chord ratio, blockage factor, etc.) and design parameters (mass flow, rotational speed, number of stages, pressure ratio, etc.), an accurate numerical model can be generated. This modeling technique is much simpler than the usual computational methods that need much more modeling/programming effort and computer run-time. Starting from a newly-designed axial-flow compressor, an optimized version is obtained with improved design-point efficiency. So, once we get the optimized geometry of the compressor, the original geometry is altered to maximize the efficiency at the design-point. Concerning the optimized version, analytical relation between the isentropic efficiency of the compressor and the flow coefficient, the work coefficient, the flow angles and the degree of reaction are obtained.

Design, Construction and Operation of Unmanned Ship Model for Multidisciplinary Engineering Education

Ahmed F. Abdel Gawad, Hamza A. Ghulman, Talal Saleh Mandourah
Conference Paper Eleventh International Conference of Fluid Dynamics (ICFD11), 19-21 Dec., 2013, Helnan Palestine Hotel, Alexandria, Egypt; 12/2013

Abstract

The present investigation represents an attempt to demonstrate the hands-on learning technique. According to the nature of modern technology, engineering students need to understand the multidisciplinary nature of engineering problems. This learning approach is important to provide students with experience in developing technical, management and work-team skills. The investigation concerned the design, construction and operation of unmanned ship model. The steps of the work as well as concluding points are illustrated.

Aerodynamic Shape-Optimization of Axial-Compressor Blades

Ahmed F. Abdel Gawad, Atef M. Alm-Eldien, Gamal Hafaz, Mohamed G. Abd El Kreim
Conference Paper Eleventh International Conference of Fluid Dynamics (ICFD11), 19-21 Dec., 2013, Helnan Palestine Hotel, Alexandria, Egypt; 12/2013

Abstract

The purpose of this work is to develop and evaluate an inverse optimization algorithm, which designs two-dimensional compressor-blade shapes based on a prescribed pressure or velocity distribution. Thus, the design meets prescribed constraints imposed by the aerodynamic performance requirements that are suggested by the designer/stakeholder. The algorithm is coded using "Visual Basic". Its three main components are: (i) Surface-panel-method flow solver, (ii) Bezier curve-surface-definition routine, (iii) Optimization method. The procedure starts with a given compressor-blade shape C4 as a base-profile. Interesting findings and beneficial conclusions are presented.

A Modified Diffusion Coefficient Technique for the Convection Diffusion Equation

Ahmed F. Abdel Gawad, S. A. Mohamed, N. A. Mohamed, M. S. Matbuly
Published Online Applied Mathematics and Computation 05/2013; 219(17):9317-9330. · 1.35 Impact Factor 12/2013

Abstract

A new modified diffusion coefficient (MDC) technique for solving convection diffusion equation is proposed. The Galerkin finite-element discretization process is applied on the modified equation rather than the original one. For a class of one-dimensional convection-diffusion equations, we derive the modified diffusion coefficient analytically as a function of the equation coefficients and mesh size, then, prove that the discrete solution of this method coincides with the exact solution of the original equation for every mesh size and/or equation coefficients. The application of the derived analytic formula of MDC is extended for other classes of convection-diffusion equations, where the analytic formula is computed locally within each element according to the mesh size and the values of associated coefficients in each direction. The numerical results for two-dimensional, variable coefficients, with boundary layers, convection-dominated problems provide stable and accurate solutions even on coarse grids.

Utilization of Whale-Inspired Tubercles as a Control Technique to Improve Airfoil Performance

Ahmed F. Abdel Gawad,
Published Online Transaction on Control and Mechanical Systems (TCMS). 05/2013; 2(5).

Abstract

This research exploits the Whale-inspired tubercles as a control technique to improve the performance of airfoils. The flow field of NACA0012 airfoil with spherical leading-edge tubercles was computationally simulated. This airfoil section resembles the flipper of the Humpback whale and is used in many engineering applications. Tubercles, with a diameter of 10% of the airfoil chord (C), are arranged such that the span-wise distance between the centerlines of two adjacent tubercles is 20% C. k- turbulence model was used for a wide range of angle of attack (α = 0o - 25o) and Reynolds number (Re = 65,000 - 1,000,000). Results demonstrated that the presence of tubercles improves the airfoil performance by delaying or even preventing stall in the investigated range of operating conditions (α and Re). Simple active control scheme is proposed to obtain optimum performance (i.e., optimum values of lift and drag coefficients).

Fire Dynamics Simulation of Large Multi-story Buildings, Case Study: Umm Al-Qura University Campus

Ahmed F. Abdel Gawad, H. A. Ghulman
Conference Paper International Conference on Energy and Environment 2013 (ICEE2013), 5-6 March 2013; 03/2013

Abstract

The computational fluid dynamics (CFD) technique is used to predict the fire dynamics in some main buildings of the campuses of Umm Al-Qura University using the Fire Dynamic Simulator (FDS). Important aspects of fire dynamics such as smoke propagation and temperature distribution were investigated. The study contributes in reducing the risks of fires by early prediction of the expected scenarios of fires and associated smoke movement. Hence, early evacuation plans can be established by authorities such as the civil defense. It was found that emergency openings (vents) in the ceiling or side walls that operate in cases of fire, according to appropriate sensors, have a significant role in directing the smoke outside the building. Based on the study, interesting conclusions are drawn and fruitful recommendations/suggestions are introduced. A simple smoke control-scheme is recommended to minimize smoke hazards.

Investigation of the Channel Flow with Internal Obstacles Using Large Eddy Simulation and Finite-Element Technique

Ahmed F. Abdel Gawad, N. A. Mohamed, S. A. Mohamed, M. S. Matbuly
Published Online Applied and computational mathematics 01/2013; 2(1):1-13. · 0.75 Impact Factor

Abstract

This paper considers the turbulent-flow characteristics and the mechanism of vortex shedding behind one and two square obstacles centered inside a 2-D channel. The investigation was carried out for a range of Reynolds number (Re) from 1 to 300 with a fixed blockage ratio β = 0.25. Comparison of the flow patterns for the single and two obstacles was feasible. The computations were based on the finite-element technique. Large-eddy simulation (LES) with the Smagorinsky method was used to model the turbulent flow. Streamline patterns and velocity contours were visualized to monitor the vortex shedding. The results show that the mechanism of the vortex shedding has different characteristics for the two cases of one and two square obstacles. Interesting findings and useful conclusions were recorded.

Numerical Simulation of Particulate-Flow in Spiral Separators: Part I, Low Solids Concentration (0.3 & 3% Solids)

Ahmed F. Abdel Gawad, M. A. Doheim, G. M. A. Mahran, M. H. Abu-Ali, A. M. Rizk
Published Online Applied Mathematical Modelling 01/2013; 37(1-2):198-215. · 2.16 Impact Factor

Abstract

The aim of the present study is the simulation of the particulate flow in spiral separators. The study is based on Eulerian approach and turbulence modeling. The results focus on particulate-flow characteristics such as the velocity, the distribution, and concentration of particulates on the spiral trough. The predicted results are compared with the experimental findings from LD9 coal spiral. The comparison shows good agreement and indicates that the most accurate turbulence model is RNG K–ε.

Numerical Simulation of the Effect of Leading-Edge Tubercles on the Flow Characteristics around an Airfoil

Ahmed F. Abdel Gawad,
Conference Paper ASME 2012 International Mechanical Engineering Congress & Exposition (IMECE2012), November 9-15, 2012; 11/2012

Abstract

The present paper concerns the developing of a new airfoil with spherical leading-edge tubercles. The investigation is based on numerical simulation of the effect of tubercles on the flow characteristics around the airfoil. The diameter of each tubercle is 0.1 C, where C is the airfoil chord. The spanwise distance between the centerlines of two adjacent tubercles is 0.2 C. The NACA0012 profile, which represents the humpback flipper and is commonly used in many aerodynamic (e.g., wind turbines) and hydrodynamic applications, was utilized in this work. A wide range of angle of attack was tested; from 0o to 25o. The values of Reynolds number ranged between 65,000 and 1,000,000. The standard k-ε model was used as the turbulence modeling technique. The numerical scheme was validated using the well-known results of the standard NACA0012 profile (without tubercles). The results cover pressure distributions, streamline patterns, and lift and drag coefficients. Useful discussions and fruitful conclusions are recorded.

Novel Electro-Mechanical Mechanism for Blade Pitch-Control of Horizontal-Axis, Home-scale Wind Turbines

Ahmed F. Abdel Gawad,
Conference Paper 48th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit (JPC)-10th Annual International Energy Conversion Engineering Conference (IECEC 2012), 30 July-1 August 2012; 08/2012

Abstract

In the present research work, the pitch-control is carried out such that the rotor blades are rotated around their longitudinal axis while the rotor continues its normal rotation. It is really a challenge to produce a clever design to pitch the rotor blades by the optimal amount so as to maximize the power output at all wind speeds. The mechanism is implemented to a three-blade, horizontal-axis, home-scale wind turbine. The mechanism is powered by a suitable DC motor. The tests were carried out in the open section of a delivery wind tunnel. The air speed was measured by a suitable anemometer. The corresponding rotational speed (rpm) and output voltage at different wind speeds were measured and recorded for calibration of the control system. The mechanism proved to be successful in controlling the pitch angle over a wide range of wind speeds.

Air-flow in Multi-stage Centrifugal Compressor

Ahmed Farouk Abdel Gawad, Nabil H Mostafa, Yasser M El-Okda, Mohamed S Emeara
Journal PaperJournal of Al Azhar University Engineering Sector (JAUES). 04/2012; 7(23):989-1006.

Abstract

Flow study in centrifugal compressors is the most complicated in turbomachinery. The difficulty is mainly due to the unsymmetrical geometry of blades and volute as well as the presence of secondary flow. The situation becomes worse in the case of multi-stage centrifugal compressor. The investigation is so complicated because of the presence of return bends between stages with the volute and the large domain of study. The present study concerns the full domain of a four-stage centrifugal compressor with its volute, for the first time. Both computational and experimental investigations were utilized to study the flow behavior inside the compressor. The computational code was validated experimentally and numerically. Compressor map was drawn numerically and experimentally. Volute removal technique could not predict surge. Full-domain solution is efficient. Surge was unsteadily simulated. Surge predicted at mass flow equal to 0.0093 kg/s for N=20,000 rpm and 1.5 pressure ratio. Uncertainty was studied for analog and digital maps. Using the parallel computational technology, by High Performance Computing “HPC” program, is recommended for future work.

A Numerical/Experimental Study of A Multi-Stage Centrifugal Compressor

Ahmed Farouk Abdel Gawad, Nabil H. Mostafa, Mohamed S. Emeara
Journal PaperThe Egyptian International Journal of Engineering Sciences and Technology (EIJEST). 05/2011; 14(2):792-801.

Abstract

Both computational and experimental investigations were utilized to study the flow behavior inside the four-stage centrifugal compressor. Computational study was carried out by the commercial code “CFD-RC”. Experimental work was accomplished by the use of a data acquisition system, advanced sensors and “LabView” interface software. Comparisons between computational and experimental outputs were performed. The computational code was validated experimentally and numerically. Compressor map was drawn numerically and experimentally. Surge was unsteadily simulated. Surge predicted at mass flow equal to 0.0093 kg/s for 12,000 rpm with full-domain solution. Using the parallel computational technology, by “HPC” program, is recommended for future work.

AERODYNAMIC PERFORMANCE OF A HIGH-TURNING TURBINE CASCADE WITH VARYING TIP CLEARANCE

Ahmed Farouk Abdel Gawad+, Mohamed R Shaalan+, Mahmoud A Elewa++
Journal PaperThe Egyptian International Journal of Engineering Sciences and Technology (EIJEST). 05/2011; 14(2):825-839.

Abstract

Modern trends in gas turbine design have been geared to produce a compact high-work-output engine as a power unit. To achieve this goal, preferring the turbine of high-turning-angle blades, the experiments focused on the effects such as lift and pressure coefficients, that to be considered when the tip clearance and incidence angle are discussed for a linear cascade. The present study aims to investigate the effect of the tip clearance on loss mechanism in turbine blades using both experimental measurements as well as CFD numerical calculations. The flow measurements are obtained using a set of calibrated five-hole probe and multi-tube manometer to measure static pressure distribution on blade surfaces, total pressure loss coefficient, velocity distribution, etc. Important points are discussed and fruitful conclusions are drawn.

Computational Analysis of the Skin-Cracking of the Airplane C-Duct

Ahmed F. Abdel Gawad, Ahmed H. Backar, Mohamed W. Al-Hazmi
Conference Paper Tenth International Congress of Fluid Dynamics (ICFD10); 12/2010

Abstract

The C-ducts are gateways that are hinged to the pylon in the airplane engines. Usually, a C-duct is located on the upper side of the engine and another one on the lower side. These gateways have openings to allow air flow for engine cooling. The present study concerns the air flow in the C-ducts. When the engine operates, the air flow is divided into two parts. The first part passes directly to the engine whereas the second part, which is larger, passes through the C-duct. Thus, most of the air (75%) passes through the C-duct in the way to the engine. The aim of the investigation is to determine the sources of the cracks that develop in the C-duct during service. These cracks require high repair costs. The C-ducts of the engine V2500 that is installed in MD-90 airplanes are considered. The actual dimensions of the C-duct were obtained by field-measurements. The commercial package “ANSYS-Fluent 12.0” is to be used. The analysis is conducted through two stages. The first stage is a finite-volume study of air flow inside the C-duct using "Fluent". Thus, the developed pressure and temperature are to be determined. The second stage is a finite-element structural analysis using "ANSYS". So, the stress values in the walls of the C-duct are calculated. The structural analysis is to be conducted under different temperature cases.

A Proposed Program to Predict the Performance of Steam Power Plants

Ahmed F. Abdel Gawad, Atef M. Alm-Eldien, Mohamed G. Abd El Kreim
Conference PaperTenth International Congress of Fluid Dynamics (ICFD10); 12/2010

Abstract

The objective of this paper is to simulate the operation of steam power plants by considering a typical example of a working power plant. The input data depends on the performance tests that were performed during the process of the delivery of the power plant by the contractor to the Egyptian Electrical Authority. The performance tests were carried out at the loads of (100%, 103% and 109% Load) as a check for the validity of the functionality of the program. It was found that the results of the program are in a good agreement with the test data.

Optimization of Natural Ventilation of Ancient Buildings towards Sustainability of Modern Buildings – Part 2: Two-Story Building

Ahmed F. Abdel Gawad,
Conference PaperTenth International Congress of Fluid Dynamics (ICFD10), 16-19 December, 2010; 12/2010

Abstract

The present study aims to extend the utilization of traditional ventilation methods to a two-story house. The type of windcatchers "Melakaf" that is investigated in part II is different from that of part I. As the computational code was validated in Part I, the analysis is based on computational predictions only. The investigation considered the same ancient Islamic building (House of Mostapha Gaapher). Two locations of the windcatchers at various operating conditions are examined. Predictions include contours of velocity, pressure coefficient and turbulence kinetic energy as well as velocity vectors and streamlines. Results demonstrate that the location of the windcatcher and the openings have an important role in specifying the flow characteristics inside the two stories of the house.

Optimization of Natural Ventilation of Ancient Buildings towards Sustainability of Modern Buildings – Part 1: One-Story Building

Ahmed F. Abdel Gawad,
Conference PaperTenth International Congress of Fluid Dynamics (ICFD10), 16-19 December, 2010; 12/2010

AThis study represents an attempt towards the utilization of traditional ventilation methods for sustainability of modern buildings. The investigation seeks the optimization of using windcatchers "Melakaf" to get best ventilation. Both computational and experimental analyses are carried out on an ancient Islamic building. Two locations of the windcatchers at various operating conditions are examined. Results cover velocity vectors and streamlines as well as contours of velocity, pressure coefficient and turbulence kinetic energy. Results explain that the location of the windcatcher has a noticeable effect on the flow characteristics inside the building.

Comparison of In-Flight Particle Properties, Splat Formation, and Coating Microstructure for Regular and Nano-YSZ Powders

Ahmed Farouk Abdel Gawad, A. Elsebaei, J. Heberlein, M. Elshaer
Journal PaperJournal of Thermal Spray Technology 01/2010; 19(1-2):2-10. · 1.48 Impact Factor.

Abstract

The relationship between atmospheric pressure plasma spray parameters and in-flight particle characteristics was determined. The morphologies of individual splats and the coating microstructure were studied for different stand-off distances and arc currents. Coating cross-sectional analysis showed that the total porosity of the coating increased with decreasing arc current, and increasing stand-off distance. Two different materials were used: the regular (r-YSZ) feed stock and the nano size (n-YSZ) agglomerated powder. The results illustrate that the r-YSZ coating has higher total porosity at higher arc currents than n-YSZ coating. The splat flattening degree and circularity was examined at different substrate temperatures for both powders. The results indicate that the flattening degree increased at high temperatures for the two materials, but the values for n-YSZ were higher than those for the r-YSZ. This study showed the operating regimes in which the use of n-YSZ yields improved coating properties.

Comparison of In-Flight Particle Properties, Splat Formation, and Coating Microstructure for Regular and Nano-YSZ Powders

Ahmed F. Abdel Gawad, A. Elsebaei, J. Heberlein, M. Elshaer
Conference Paper International Thermal Spray Conference & Exposition (ITSC), Flamingo Hotel, Las Vegas, Nevada, USA; 05/2009

Abstract

In this study the relationship between the parameters of the atmospheric plasma spraying process and the in-flight properties of the particles was determined experimentally by using the DPV2000 system. The coating microstructure was investigated using analysis of SEM images. The morphology of individual splats was studied to shed light on the relationship between the in-flight particle properties and the coating characteristics. Coating microstructure was studied for different spraying parameters, e.g. stand-off distance and arc current. A Matlab code was constructed for porosity analysis of the SEM images. The coating cross-section analysis showed that the total porosity of the coating increased with decreasing arc current, and increasing stand-off distance. Two different materials were used for the APS coating the regular (r-YSZ) feed stock and the nano size (n-YSZ) agglomerated powder. The results illustrate that the r-YSZ coating has higher total porosity at higher arc currents than n-YSZ coating. The splat flattening degree and circularity behavior was examined at different substrate temperatures for both powders. The results indicate that the flattening degree increased for highly polished substrates at high temperatures for the two materials but the values for n-YSZ were higher than those for the r-YSZ. This study showed the operating regimes in which the use of n-YSZ yields improved coating properties.

Investigation of the Aerodynamic Effect of the Interfering Gap between Uncommon Towers

Ahmed Farouk Abdel Gawad, W. M. Elwan, H. E. Abdel Hameed, S. S. Abdel Aziz
Journal PaperJournal of Engineering and Applied Science (JEAS), Faculty of Engineering, Cairo University, Egypt. 12/2008; 55(6):493-512.

Abstract

A computational model and an experimental work were developed to study the aerodynamic effect of the gap between uncommon towers. The gap between the buildings has a significant effect on the flow characteristics around the buildings. The investigation covers two main interference cases. The first case concerns two similar towers. The second case deals with two different interfering towers. The computations were performed using a suitable steady incompressible turbulence model. The experiments were carried out using an open-circuit suck-down wind tunnel. Scaled models of the towers were constructed and equipped with measuring facility. The results demonstrate the distributions of the pressure and load coefficients, at various elevations along the height of the tower model. The effect of changing the value of the gap is carefully considered. Moreover, results show different streamline patterns. Validity of using artificial neural networks to predict the values of load coefficient is tested. Results show that a good architecture of neural networks helps greatly in tuning the target predictions.

Computational Prediction of Water-Flow Characteristics in Spiral Separators: Part I, Flow Depth and Turbulence Intensity

Ahmed Farouk Abdel Gawad, M. A. Doheim, G. M. A. Mahran, M. H. Abu-Ali, A. M. Rizk
Journal PaperJournal of Engineering Sciences, Faculty of Engineering, Assiut University, Egypt. 07/2008; 36(4):935-950.

Abstract

A spiral separator is one of the commonly-used gravity-concentration devices. It has been widely used in the mineral processing of coal. Also, it is used for the inexpensive pre-concentration of low grade ores. Spiral separator consists of an open trough that twists downward in helical configuration about a central axis. The aim of the present study is the simulation of the flow of water in spiral separators. The study is based on volume of Fluid (VOF) approach and turbulence modeling. The results focus on waterflow characteristics such as the depth of water as well as the turbulence intensity. The results demonstrated that the water depth and turbulence intensity on spiral trough increase smoothly outward. Predicted results are compared with the experimental findings from LD9 coal spiral. Comparison between the predicted and the measured values show good agreement and the most accurate turbulence model is RSM.

Computational Prediction of Water-Flow Characteristics in Spiral Separators: Part II, The Primary and Secondary Flows

Ahmed Farouk Abdel Gawad, M. A. Doheim, G. M. A. Mahran, M. H. Abu-Ali, A. M. Rizk
Journal PaperJournal of Engineering Sciences, Faculty of Engineering, Assiut University, Egypt. 07/2008; 36(4):951-961.

Abstract

This study presents a mathematical model to predict water-flow characteristics, especially primary (downstream) and secondary velocities on the spiral trough. The study is based on volume of Fluid (VOF) approach and turbulence modeling. The applied turbulence models are k-ε, RNG k-ε, SST k-ω, and RSM. The results show that the primary velocity increases on the spiral trough with increasing of the radial distance from central column, and the air friction with the water decreases the primary velocity at the free surface. The model is validated against experimental data from LD9 coal spiral. Comparisons between the predicted and the measured values show good agreements, and the RSM is the most accurate turbulence model while the SST k-ω model is the lowest accuracy.

Investigation of The Dilution of Outfall Discharges Using Computational and Neuro-Fuzzy Techniques

Ahmed F. Abdel Gawad,
Conference Paper 2007 ASME International Mechanical Engineering Congress & Exposition (IMECE2007), 5-11 November 2007; 11/2007

Abstract

This paper represents a comprehensive study of the dilution of multiple outfall discharges. The discharges emerge from the passage bottom in the form of circular jets. The investigation is concerned with the bounded water passages (open channels). These water passages are frequently found in the Nile delta in Egypt. Moreover, a neuro-fuzzy approach is proposed to predict important characteristics of the dilution process. The main objective is to use the computational results to train the neuro-fuzzy models. Useful conclusions and suggestions are drawn from the present investigation.

Computation of Partial Cavitation Characteristics over Two-Dimensional Symmetric Hydrofoils Using A Newly Proposed Boundary Element Algorithm

Ahmed F. Abdel Gawad, Norhan A. Mohamed, Said G. Ahmed
Published Online International eJournal of Engineering Mathematics: Theory and Application. 06/2007; 1.

Abstract

In the present paper, the boundary element method (BEM) is used with a new numerical algorithm to predict the cavitation characteristics over two-dimensional symmetric hydrofoils. Two main difficulties encountered when predicting the cavitation over the hydrofoil, namely: (1) The free surface location is not known in advance and should be determined, (2) The potential at the leading point is not known. The present algorithm overcomes these difficulties through some mathematical manipulation by tracing the free surface. In addition to the above-mentioned difficulties, four main working parameters and their effect on the cavitation characteristics are also investigated. The present algorithm was first tested on some existing results and an execllent agreement was obtained, then more computations and results were performed.

Characteristics of Wind Forces Acting on Uncommon Tall Buildings

Ahmed F. Abdel Gawad, Wael M. Elwan, Salem S. Abdel Aziz, Hesham E. Abdel Hameed
Conference Paper Al-Azhar Engineering 9th International Conference, Cairo, Egypt; 04/2007

Abstract

In the present work, a CFD model was developed to predict the flow characteristics around four different models of uncommon tall buildings. These models simulate typical actual famous tall buildings. Local and total wind forces on tall buildings are investigated in terms of the distribution of force parameters, such as pressure and drag coefficients, at different levels along the height of the building model for different wind directions. Also, the results include the streamline patterns as well as contours of Cp and turbulence kinetic energy. Results demonstrate that both the pressure and drag coefficients, for most of the studied cases, reach their maximum values (corresponding to stagnation) at 0.86 of the height of the building. Then, the values of these two coefficients decrease gradually towards the roof of the building. In the unsteady analysis, it was found that pressure takes a specified period of time to reach the steady state condition. This time period depends on the building configuration and the incoming wind direction. Interesting findings and conclusions are reported.

A Boundary Element Approach with New Algorithm to Predict Partial Cavitation around 2D Hydrofoils

Ahmed F. Abdel Gawad, Norhan A. Mohamed, Said G. Ahmed
Conference Paper Eighth International Congress of Fluid Dynamics & Propulsion (ICFDP 8), December 14-17, 2006; 12/2006

Abstract

In the present paper, the boundary element method is used with a new numerical algorithm to predict the cavitation around two-dimensional hydrofoils. Two main difficulties encountered when predicting the cavitation around the hydrofoil, which are: (1) The free surface location is not known in advance and should be determined, (2) The potential at the leading point is not known. The present algorithm overcomes these difficulties through some mathematical manipulation by tracking the free surface. In addition to the pre-mentioned difficulties, three main parameters and their direct effect on the cavitation are also investigated. The present algorithm was first tested on some existing results and an excellent agreement was obtained, then more computations and results were performed.

Aerodynamic and Heat Transfer Characteristics around Vehicles with Different Front Shapes in Driving Tunnels

Ahmed F. Abdel Gawad, Aly A. Abdel Aziz
Conference Paper Eighth International Congress of Fluid Dynamics & Propulsion (ICFDP 8), December 14-17, 2006; 12/2006

Abstract

The aerodynamic flow around and behind of heavy vehicles is a very important field of investigation to get over the problem of lateral instability. Heat transfer from rear of such vehicle models has gained a growing part of investigators attention. The present experimental and numerical investigation has been carried out to study the effect of air-stream velocity, gap ratio, and front shape of vehicles on the flow field characteristics and heat transfer from the rear of these vehicles to air flow around them. Three vehicle models (with flat-, inclined- and curved-front shapes) have been designed and constructed from Plexiglas and tested by using a suction-type wind tunnel. A heating panel is provided with copper-constantan thermocouples for measuring the temperature and heat transfer coefficient on the rear surface. The numerical investigation was carried out using a commercial CFD code. The flow characteristics that couldn’t be measured experimentally (e.g. velocity vectors, wake patterns, etc.) were found numerically. Also, visualization technique was used to give an overall view of flow pattern around the vehicle models. Practical observations and suggestions are recorded. It was found that for both the flat- and inclined-front vehicles, the front of the vehicle is pushed to turn towards the adjacent side wall of the tunnel. For the curved-front vehicle, the front of the vehicle is generally pushed away from the adjacent side wall of the tunnel. Also, the cooling of the inclined- and curved-front vehicles is better than the cooling of the flat-front vehicle by about 20%.

Wind and Environmental Effect on the Overhead High Voltage Transmission Lines

Ahmed F. Abdel Gawad, Amal F. Abdel Gawad, Abdel-Salam A. Zoklot
Conference Paper Sustainable City 2006 Conference, July 17-19, 2006; 07/2006

Abstract

The present work is an experimental study of the effect of wind on high voltage transmission lines. Two sets of models, representing a pair of tension towers and a pair of suspension towers, were constructed to a suitable scale. The two sets were tested using a delivery wind tunnel. Three different sizes of conductors were tested at three values of wind speed (5, 10 & 15 m/s). Also, the effect of environmental conditions (ice & mud) was studied. Measurements of the horizontal and vertical displacements of the conductors of different phases were recorded. The additional tension of the conductors, due to aerodynamic drag, was measured as well. Useful observations and conclusions are stated.

Computational and Neuro-Fuzzy Study of the Effect of Small Objects on the Flow and Thermal Fields of Bluff Bodies

Ahmed F. Abdel Gawad,
Conference Paper 8th Biennial ASME conference on Engineering Systems Design and Analysis (ESDA2006), July 4-7, 2006; 07/2006

Abstract

The aim of the present study is to find computationally the optimum parameters that affect the drag reduction of bluff bodies using a small object (obstacle). These parameters include the size of the obstacle as well as the gap between the obstacle and the bluff body. Two- and three-dimensional bodies were investigated in turbulent flow fields. The research was focused on the cases of the rectangular-section obstacle. Four values of the obstacle size were studied, namely: 4%, 10%, 35%, and 100% of the size of the bluff body. The effect of the obstacle on the thermal field of the two-dimensional body was also studied. Comparisons were carried out with the available experimental measurements. A proposed neuro-fuzzy approach was used to predict the drag reduction of the entire system. Results showed that system drag reductions up to 62% (twodimensional flows) and 48% (three-dimensional flows) can be obtained. Also, enhancement of the body cooling up to 75% (two-dimensional flows) may be achieved. Generally, useful comments and suggestions are stated.

Numerical and neural study of flow and heat transfer across an array of integrated circuit components

Ahmed F. Abdel Gawad, M.M. Nassief, N.M. Guirguis
Conference Paper Thermal and Thermomechanical Phenomena in Electronics Systems, 2006. ITHERM '06. The Tenth Intersociety Conference on; 01/2006

Abstract

The present study is concerned with the flow and heat transfer for laminar flow over an array of rectangular blocks. These blocks represent finite heat sources on parallel plates (e.g. the components of integrated circuits). The study is based on simulations of three and six aligned hot small blocks. The investigation aims to determine the effect of different parameters (e.g. Reynolds number and blocks arrangement) on the magnitude and location of the maximum temperature at the surfaces of the hot blocks. The numerical investigation was carried out using the commercial code ANSYS 5.4 based on the finite element technique. Also, experimental investigation was carried out for verification and more understanding of the problem. Neural networks were utilized to predict the values of the mean Nusselt number of the integrated circuit components. Useful discussions and fruitful comments are presented.

Numerical and Neural Study of Flow and Heat Transfer across an Array of Integrated Circuit Components

Ahmed Farouk Abdel Gawad, Mofreh M. Nassief, Nabil M. Gurguis
Journal PaperJournal of Engineering and Applied Science (JEAS), Faculty of Engineering, Cairo University, Egypt. 10/2005; 52(5):981-1000.

Abstract

The present study is concerned with the flow and heat transfer for laminar flow over an array of rectangular blocks. These blocks represent finite heat sources on parallel plates (e.g. the components of integrated circuits). The study is based on simulations of three and six aligned hot small blocks. The investigation aims to determine the effect of different parameters (e.g. Reynolds number and blocks arrangement) on the magnitude and location of the maximum temperature at the surfaces of the hot blocks. The numerical investigation was carried out using the commercial code ANSYS 5.4 based on the finite element technique. Also, experimental investigation was carried out for verification and more understanding of the problem. Neural networks were utilized to predict the values of the mean Nusselt number of the integrated circuit components. Useful discussions and fruitful comments are presented.

Experimental and Numerical Investigation of Internal and External Flow Fields for Buildings with Porous Canopy Roofs

Ahmed F. Abdel Gawad, Osama E. Abdellatif
Conference Paper Al-Azhar Engineering 8th International Conference, 24-27 December, 2004; 12/2004

Abstract

The internal and external flow fields of a range of canopy or open roof forms with different porosities are presented. The influences of roof shape, wind speed, and porosity (0 – 25%) were carefully studied. Three roof shapes (monoslope, Gable, and Gutter) were considered. The computational study is based on turbulent modeling for steady incompressible flow. Wind tunnel simulations were used to measure the distributions of the static pressure. Within the range of the studied parameters, porosity causes considerable variations of the drag forces. Artificial neural networks were used to predict the values of the drag coefficient. Useful conclusions and suggestions are recorded.

A New Approach to Minimize the Wind Load on Interfering Tall Buildings Based on Numerical and Optimization Techniques

Ahmed F. Abdel Gawad,
Conference Paper Al-Azhar Engineering 8th International Conference, 24-27 December, 2004; 12/2004

Abstract

This study represents a comprehensive investigation of the aerodynamic characteristics of two interfering tall buildings. The influence of key parameters, such as the aspect ratio (Hi/B = 3, 4, 5, 6, 7.5, 8 & 10), gap ratio (HL/B = 1 & 2), and height ratio (H1/H2 = 2, 1.33, 1.0, 0.75 & 0.5) is discussed. The study is based on turbulent modeling for steady, incompressible flow field. Dimensional analysis was adopted to find the non-dimensional groups affecting the wind loading on the front building. Error analysis was carried out to determine the best correlation relating the key parameters and the wind loading. Optimization was used to minimize the wind loading on the front building. Interesting findings and suggestions are reported.

Turbulent Modeling of the Plumes of a Single Stack

Ahmed F. Abdel Gawad, Ahmed F. Abdel Azim, M. M. Ibrahim
Conference Paper International Mechanical Engineering Conference, December 5-8, 2004; 12/2004

Abstract

Due to the continuous increase of inhabitants needs, developing countries are forced to construct more industrial facilities. However, air quality management is one of the serious problems that face the developing countries. Thus, an understanding of the plume behavior, emitting from an industrial stack, is essential for the process of planning and constructing of new industrial cities. Among others, the approach of computational fluid dynamics (CFD) modeling seems to be attractive in describing the plume behavior. This study is a parametric investigation of the characteristics of the pollution plumes emitting from a single stack. Twoand three-dimensional turbulent flow fields are solved by k-ε model and large eddy simulation (LES), respectively. The influence of main parameters, such as wind speed (0–20 m/s), stack height (10–100 m), stack outlet diameter (1–3 m), and gas-exit speed (2–10 m/s), is discussed. The results cover the plume characteristics (maximum distance, height, and width) and the concentrations of pollutants (gaseous and/or solid) as well as the tracks of the emitted particles, refer to Fig. (1). Valuable conclusions and suggestions can be drawn from the present work to determine the optimum health-safe distance away from an industrial stack.

Study of Particle Dynamics in a Plasma Torch

Ahmed F. Abdel Gawad, A. El Sebay, M. K. Moubasher
Conference Paper Second International Conference on Engineering Mathematics and Physics, Military Technical College, Cairo, Egypt; 11/2004

Abstract

A model of an atmospheric plasma torch is constructed. The model is designed from the spark plug of three plugs with threaded copper cover. In this model, we use an ac transformer as well as air as the inlet gas. So, we had a plasma jet of 5 cm-height, temperature range of (340-1230 K) and a power range of (380-830 W). In the experiment, the electrical circuit of the torch had two configurations, one without the capacitor and the other with the capacitor, which improved the power of the torch. The temperature, velocity and pressure profiles are presented against the axial distance outside the torch. The model shows the optimum position of the workpiece relative to the torch according to the required temperature in cutting or welding processes. Also, the electrical characteristics of the torch are presented.

Experimental, Numerical and Neural Investigation of the Aerodynamic Characteristics for Two-Dimensional Wings in Ground Effect

Ahmed F. Abdel Gawad, Osama E. Abdellatif
Conference Paper Conference: Al-Azhar Engineering 7th International Conference, 7-10 April, 2003

Study of Both Airflow and Thermal Fields in a Room Using K-epsilon Modelling and Neural Networks

Ahmed F. Abdel Gawad
Conference Paper Al-Azhar Engineering 7th International Conference, 7-10 April, 2003; 04/2003

Abstract

K-ε modeling is used to investigate the effect of various parameters on the airflow pattern and thermal field inside a ventilated room. These parameters include room shape and geometry, position of obstacles inside the room, inlet velocity, and inlet and outlet arrangement. Artificial Neural Networks (ANN) are also used for the first time to predict the flow and thermal characteristics inside the room. Results include the velocity vectors, streamlines as well as pressure, temperature and kinetic energy contours. The distributions of the Nusselt number on the four walls of the room are also presented. Special consideration is paid to the effect of obstacles inside the room. Details of the coordinates of the centers of the main vortices and turbulence characteristics are presented for the first time. The results suggest that computational methods can be used to provide designers with a database of the flow and thermal behaviors at different arrangements of a ventilated room.

Numerical and Neural Study of the Turbulent Flow around Sharp-Edged Bodies

Ahmed F. Abdel Gawad
Conference Paper 2002 Joint US ASME-European Fluids Engineering Division Summer Meeting, July 14-18, 2002; 07/2002

Abstract

The study is based on K-ε turbulence modeling using both structured and unstructured grids. The pressure distributions in the flow field and on the surfaces of the bodies are determined. Different parameters that affect the flow field such as Reynolds number, aspect ratio of the body, and flow direction are considered. Special concern is paid to the separations at the corners of the body and the circulations behind the body. The thermal behavior due to the flow field is also considered. Nusselt number on the heated surfaces of the body is examined. The thermal behavior of a given body is strongly dependent on its aerodynamic characteristics. Comparisons are made between the present results and the available experimental data. Artificial Neural Network (ANN) was used to predict the values of the drag coefficient. Many useful conclusions and suggestions were drawn from the study.

INFLUENCE OF VARIOUS FACTORS ON THE FLOW CHARACTERISTICS THROUGH A GAS TURBINE CASCADE

Ahmed F. Abdel Gawad, Osama E. Abdellatif
Conference Paper Seventh International Congress on Fluid Dynamics and Propulsion,, December 19-21, 2001, Sharm El-Sheikh, Sinai, Egypt; 12/2001

Abstract

The influence of different factors on the flow characteristics of a gas turbine cascade was studied. These factors include blade shape, incidence angle, Reynolds number, and mainstream turbulence. Two five-blade linear cascades in a low-speed wind tunnel facility were used in the experiments. The mainstream Reynolds numbers were 202,000 and 166,000 based on the cascade inlet velocity and blade chord. The blade shapes are based on the Wortmann Fx-66 blade. Comparisons were made with the available published experimental data. The results show that there are important effects of the examined factors on the flow characteristics of the cascade. Useful practical conclusions were driven from the results.

Study of Air Pollution due to Industrial Spots Nearby the Campus of Zagazig University (Egypt)

Ahmed F. Abdel Gawad, Ahmed F. Abdel Azim, M. M. Ibrahim
Conference Paper Ninth International Conference on Modelling, Monitoring, and Management of Air Pollution, September 12-14, 2001; 09/2001

Abstract

Pollution is one of the important problems facing the developing countries. Air and water pollution may reach unacceptable limits. This situation affects greatly the health and overall activity of the humans. Air pollution is expected to have a pronounced effect on the students’ health, education, and all their daily activities. The present study concerns with the concentration and distribution of pollution emissions from industrial chimneys located in the neighborhood of the main campus of Zagazig University, Egypt. The investigation is based on the Cornell Mixing Zone Expert System (CORMIX, ver. 3) software. Useful remarks, which may help in reducing the pollution effect in the university campus, are concluded.

Effect of Different Parameters on the Drag Coefficient for Commercial Vehicles

Ahmed F. Abdel Gawad, Ahmed F. Abdel Azim
Conference Paper Ninth International Conference on Aerospace Sciences & Aviation Technology, May 8-10, 2001; 05/2001

Abstract

Large commercial vehicles (e.g. truck-trailer combination), due to their function, are bluff bodies by nature. The truck-trailer combination usually gives a drag coefficient that is less than that for a trailer alone. The interference between the commercial vehicles and other small vehicles is of primary importance especially when moving in driving tunnels that are characterized by their limited space. 1/19-scale models for commercial vehicles are employed in the experimental work performed here. Three-dimensional pressure measurements are recorded for analyzing the aerodynamic behavior and calculating the drag coefficient. Add-on devices (deflectors) are used. Measurements are supported by both numerical calculations and flow visualization. Results show that add-on devices play a very important role in improving the aerodynamic characteristics of commercial vehicles.

Aerodynamics of Vehicles through Driving Tunnels – Experimental Study of Interference and Drag Reduction

Ahmed F. Abdel Gawad,
Conference Paper SAE 2001 World Congress, March 5-8, 2001; 03/2001

Abstract

Due to energy and material considerations, vehicle manufacturers move in the direction of producing smaller and lighter vehicles. With further reductions in the weight of vehicles, aerodynamic forces emerge as a major factor in energy and stability calculations. The situation becomes more important when moving through driving tunnels. Because of the limited space of a driving tunnel, vehicles are usually forced to interfere severely. 1/25-scale models for domestic bus and passenger car are employed. Three-dimensional pressure measurements are recorded for analyzing the aerodynamic behavior and calculating the drag coefficient. Measurements are supported by numerical calculations and flow visualization. Results show that vehicle interference has a favorable effect on reducing drag. However, stability considerations should be noticed.

Roll Stabilization by Anti-Roll Passive Tanks

Ahmed F. Abdel Gawad, Saad A. Ragab, Ali H. Nayfeh, Dean T. Mook
Book Chapter Ocean Engineering 01/2001; Vol. 28(5):457-469. · 1.16 Impact Factor

Abstract

Since the most severe roll motion occurs at resonance (known as synchronous rolling), the best way of reducing it is to increase the damping. The most common means of doing so is by the installation of bilge keels. If more control is required, both anti-roll tanks and fins are used. Tanks have the advantage of being able to function when the ship is not underway. The use of tanks with liquid free surfaces for reducing roll motion of ships is an old idea. Many researchers have studied the design of anti-roll tanks. However, most of the past effort has concentrated on studying the performance of anti-roll tanks in damping the roll motion of the ship. Little attention has been paid to the fluid motion inside the tank itself. Another important issue is the tank tuning. Proper tuning of the anti-roll tank, to match the ship's natural frequency, is very important in reducing the roll motion. This paper concentrates on the most familiar type, which is the U-tube passive tank as a mechanical absorber of roll motion. A detailed study, covering tank damping, mass, location relative to the ship CG, and tuning, is presented. New suggestions and observations are stated concerning tank damping and tuning.

Horizontal Transitions in Rectangular Open Channels Using the K-Epsilon Model

Ahmed F. Abdel Gawad, Mohsen M. Ezzeldin
Journal Paper Journal Mataria Faculty of Engineering, Helwan Univ., Cairo, Egypt. 08/2000; 70:22-38.

An Experimental Investigation of Closely Interfering Airfoils at a Low Reynolds Number

Ahmed F. Abdel Gawad, Osama E. Abdellatif
Conference Paper 5th Biennial Conference on Engineering Systems Design & Analysis, ESDA 2000, July 10-13, 2000; 07/2000

Abstract

An experimental study was carried out with two pairs of airfoils (NACA 4412, and NACA 4418) in closely tandem arrangements at a Reynolds number of 220,000. Static pressure distributions were acquired for the upper and lower surfaces of each airfoil. Lift, drag and pressure coefficients were calculated from the pressure distributions. Flow visualization using kerosene smoke was performed to compliment the experimental data. Results show a considerable change in the pressure distributions on the rear airfoil at different arrangements. A total improvement of the performance is reported. Comparisons are made with the theoretical results based on the vortex-panel method.

Calculation of Turbulent Flow Through a Channel with Two Opposite Ribbed-Walls

Ahmed F. Abdel Gawad,
Conference Paper ASME 2000 Fluids Engineering Division Summer Meeting, June 11-15, 2000; 06/2000

Numerical Investigation of Vehicles Aerodynamics through Driving Tunnels

Ahmed F. Abdel Gawad, Ahmed F. Abdel Azim
Conference Paper 2000 Future Car Congress, April 2-6, 2000; 04/2000

Abstract

Due to the rapid development in many parts of Egypt, construction of a wide road network is maintaining a rapid pace. But, those roads are affected by the overcrowded big cities. Thus, there is a growing need for driving tunnels to reduce the traffic problems and facilitate transportation. This issue is highly related to economic (fuel consumption) and environmental (pollution and noise) matters. Up to our knowledge, this paper represents the first numerical study to concern driving tunnels in the Middle East. Actual domestic tunnels and vehicles are computationally simulated. Investigations concentrate on flow behavior, especially overall drag coefficient and wake structure behind vehicles. Results show that many parameters, such as tunnel height, and vehicle height and speed, affect the aerodynamic characteristics through driving tunnels.

A Flow Visualization Study of the Aerodynamic Interference between Passenger Cars

Ahmed F. Abdel Gawad, Ahmed F. Abdel Azim
Conference Paper SAE 2000 World Congress, March 6-9, 2000; 03/2000

Abstract

This research work is concerned with experimental studies of the aerodynamic interference between passenger cars. Aerodynamic interference covers the two cases of vehicles in a convoy and in parallel passing (overtaking). Vehicles are assumed to be moving in open roads. Flow visualization technique is used to clarify the flow behavior, especially wake structure behind interfering passenger cars. This paper is a trial to further explain the aerodynamic characteristics, usually reported in the form of pressure distributions and drag forces, through visible observations. Visualization images of passenger cars in close interference are presented for the first time. Special attention is paid to the effect of Reynolds number on flow pattern especially in severe interference conditions. Results show that flow structure around interfering cars changes dramatically depending on the gap between the cars and Reynolds number. Interesting flow structures are captured and analyzed.

Simulation of Turbulent Flow in a Channel with Repeated Ribs on One Wall

Ahmed F. Abdel Gawad, Saad A. Ragab
Conference Paper 38th Aerospace Sciences Meeting & Exhibit, 10-13 Jan. 2000; 01/2000

Comparison between the Results of Large Eddy Simulation and K-epsilon Modelling for Straight Non-Circular Ducts

Ahmed F. Abdel Gawad, M. R. Shaalan, O. E. Abdel Latif, S. A. Ragab, I. M. Shabaka
Conference Paper 3rd ASME/JSME Joint Fluids Engineering Conference, July 18-23, 1999; 07/1999

Turbulent Flow and Heat Transfer in Rotating Non-Circular Ducts with Nonlinear K-epsilon Model

Ahmed F. Abdel Gawad, O. E. Abdel Latif, S. A. Ragab, I. M. Shabaka
Conference Paper AIAA 36th Aerospace Sciences Meeting & Exhibit, January 12-15, 1998; 01/1998

Large Eddy Simulation of the Near Wake of a Rectangular Wing

Ahmed F. Abdel Gawad, K. S. Youssef, S. A. Ragab, W. J. Devenport
Conference Paper AIAA 36th Aerospace Sciences Meeting & Exhibit, January 12-15, 1998; 01/1998

Numerical Prediction of Turbulent Heat Transfer in a Rotating Square Duct with Nonlinear K-epsilon Model

Ahmed F. Abdel Gawad, O. E. Abdel Latif, Saad A. Ragab, M. R. Shaalan
Conference Paper Eleventh Symposium on Turbulent Shear Flows, September 8-11, 1997; 09/1997

Large Eddy Simulation for Fully Developed Flow in a Square Duct

Ahmed F. Abdel Gawad, Saad A. Ragab, A. Luton, Osama E. Abdel Latif
Conference Paper 1997 ASME Fluids Engineering Division Summer Meeting (FEDSM’97), June 22-26, 1997; 06/1997

Ahmed F. Abdel Gawad, Osama E. Abdel Latif, Ibrahim M. Shabaka, Mohammad R. Shaalan
Conference Paper1997 ASME Fluids Engineering Division Summer Meeting (FEDSM’97), June 22-26, 1997; 06/1997

Part-Time Teaching

  • 2009 1998

    “Faculty of Engineering”

    “Faculty of Engineering”, October 6 University, October 6 City, Egypt, 1998-2009.

  • 2009 2006

    “Faculty of Computer and Information Science”

    “Faculty of Computer and Information Science”, Ain Shams University, Cairo, Egypt, Fall-Semester, 2006-2009.

  • 2009 2008

    “Canadian International College (CIC)”

    “Canadian International College (CIC)”, New Cairo, Cairo, Egypt, 2008-2009.

  • 2002 2002

    “Faculty of Engineering”

    “Faculty of Engineering”, Misr University, October 6 City, Egypt, 2002.

  • 2000 1999

    “Labor University”

    “Labor University, Zagazig Branch, Egypt, Fall-Semester, 1999-2000.

Laboratories

  • 1. Development of Fluid Mechanics Lab. in Mechanical Engineering Department, College of Engineering and Islamic Architecture, Umm Al-Qura University, Makkah, Saudi Arabia, as part of the ABET Accreditation process.
  • 2. Construction and development of the Thermo-Fluid Lab. in Faculty of Engineering, October 6 University, October 6 City, Egypt. Preparing the training manual and experimental sheets of the lab. Training the demonstrators and technical staff, 2002.
  • 3. Development of the Fluid Mechanics Lab. in Mechanical Power Engineering Department, Faculty of Engineering, Zagazig University, Zagazig, Egypt. Sharing in a project for the development of Fluid Mechanics Lab. funded by the supreme council of universities, Egypt, 1995.
  • 4. Supervision of the Visualization and Multimedia Lab. in Mechanical Power Engineering Department, Faculty of Engineering, Zagazig University, Zagazig, Egypt, till April 2010.
  • 5. Supervision of the Fluid Mechanics Lab. in Mechanical Power Engineering Department, Faculty of Engineering, Zagazig University, Zagazig, Egypt, till April 2010.

B.Sc. Graduation Projects

  • 1. “Utilization of Human-emitted Heat for Hand lamps” (2013/2014) - Mechanical Engineering Department, College of Engineering and Islamic Architecture, Umm Al-Qura University, Makkah, Saudi Arabia.
  • 2. “Utilization of Small-Scale Power Wheel for House Applications” (2013/2014) - Mechanical Engineering Department, College of Engineering and Islamic Architecture, Umm Al-Qura University, Makkah, Saudi Arabia.
  • 3. “Development of the Clock Tower in Makkah by Utilization of Renewable Energy Sources” (2013/2014) - Mechanical Engineering Department, College of Engineering and Islamic Architecture, Umm Al-Qura University, Makkah, Saudi Arabia.
  • 4. “A Novel Technique for Laptop Cooling” (2012/2013) - Mechanical Engineering Department, College of Engineering and Islamic Architecture, Umm Al-Qura University, Makkah, Saudi Arabia.
  • 5. “Construction and Testing of an Un-manned Under-water Vehicle for Exploration of Sunken Ships” (2012/2013) - Mechanical Engineering Department, College of Engineering and Islamic Architecture, Umm Al-Qura University, Makkah, Saudi Arabia.

    "This project was chosen among the top twenty projects (out of 591 projects) proposed for 'National Technology Entrepreneurship Challenge-NTEC' by King Abdulaziz City for Science and Technology, KACST, Saudi Arabia, 27-29 September 2012"

  • 6. “Construction and Testing of a High-Speed Train” (2012/2013) - Mechanical Engineering Department, College of Engineering and Islamic Architecture, Umm Al-Qura University, Makkah, Saudi Arabia.
  • 7. “Utilization of Human Foot-Steps for Power Generation” (2012/2013) - Mechanical Engineering Department, College of Engineering and Islamic Architecture, Umm Al-Qura University, Makkah, Saudi Arabia.
  • 8. “Utilization of Sea Waves for Electricity Generation” (2012/2013) - Mechanical Engineering Department, College of Engineering and Islamic Architecture, Umm Al-Qura University, Makkah, Saudi Arabia.
  • 9. “Construction and Testing of an Under-water Vehicle” (2011/2012) - Mechanical Engineering Department, College of Engineering and Islamic Architecture, Umm Al-Qura University, Makkah, Saudi Arabia.
  • 10. “Automated Storage and Retrieval System (AS/RS)” (2011/2012) - Mechanical Engineering Department, College of Engineering and Islamic Architecture, Umm Al-Qura University, Makkah, Saudi Arabia.
  • 11. “Experimental Simulation of Sea Waves to Gain Mechanical Energy” (2011/2012) - Mechanical Engineering Department, College of Engineering and Islamic Architecture, Umm Al-Qura University, Makkah, Saudi Arabia.
  • 12. “Construction and Testing of a Vertical-axis Water-Current Turbine” (2011/2012) - Mechanical Engineering Department, College of Engineering and Islamic Architecture, Umm Al-Qura University, Makkah, Saudi Arabia.
  • 13. “Construction and Testing of a Wheel Turbine” (2010/2011) - Mechanical Engineering Department, College of Engineering and Islamic Architecture, Umm Al-Qura University, Makkah, Saudi Arabia.
  • 14. “Fire Dynamics Simulation in Buildings” (2010/2011) - Mechanical Engineering Department, College of Engineering and Islamic Architecture, Umm Al-Qura University, Makkah, Saudi Arabia.
  • 15. “Construction and Testing of a wind turbine for home use” (2010/2011) - Mechanical Engineering Department, College of Engineering and Islamic Architecture, Umm Al-Qura University, Makkah, Saudi Arabia.
  • 16. “Design, construction, and testing of a horizontal-axis wind turbine and application of control systems” (2008/2009)-Mechanical Power Eng. Dept., Faculty of Eng., Zagazig University, Zagazig, Egypt. http://www.windturbine.co.nr/
  • 17. “Automotive speed control system” (2007/2008)-Mechanical Power Eng. Dept., Faculty of Eng., Zagazig University, Zagazig, Egypt.
  • 18. “Interactive simulation and visualization of fluid motion” (2007/2008)-Scientific Computing Dept., Faculty of Computer and Information Science, Ain Shams University, Egypt.
  • 19. “Design, construction and testing of unmanned fishing boat” (2006/2007)-Mechanical Power Eng. Dept., Faculty of Eng., Zagazig University, Zagazig, Egypt. http://www.freewebtown.com/ship/
  • 20. “Design, construction and testing of a sailing boat” (2005/2006)-Mechanical Power Eng. Dept., Faculty of Eng., Zagazig University, Zagazig, Egypt.
  • 21. “Construction and testing of models of uncommon-shaped buildings” (2005/2006)-Mechanical Power Eng. Dept., Faculty of Eng., Zagazig University, Zagazig, Egypt.
  • 22. “Investigation of aerodynamic characteristics of models of missiles” (2005/2006)-Mechatronics Eng. Dept., Faculty of Eng., October 6 University, October 6 City, Egypt.
  • 23. “Design and construction of unmanned model of a hovercraft” (2004/2005)-Mechanical Power Eng. Dept., Faculty of Eng., Zagazig University, Zagazig, Egypt.
  • 24. “Design and construction of a small-size suction wind tunnel” (2004/2005)-Mechanical Power Eng. Dept., Faculty of Eng., Zagazig University, Zagazig, Egypt.
  • 25. “Investigation of aerodynamic characteristics of two interfering low-rise buildings” (2004/2005)-Mechatronics Eng. Dept., Faculty of Eng., October 6 University, October 6 City, Egypt.
  • 26. “Investigation of aerodynamic characteristics of the flow inside buildings” (2003/2004)-Mechanical Power Eng. Dept., Faculty of Eng., Zagazig University, Zagazig, Egypt.
  • 27. “Wind effect over high voltage transmission line” (2003/2004)-Mechanical Power Eng. Dept., Faculty of Eng., Zagazig University, Zagazig, Egypt.
  • 28. “Wind tunnel speed control and its effect on building models” (2003/2004)-Mechatronics Eng. Dept., Faculty of Eng., October 6 University, October 6 City, Egypt.
  • 29. “Design, construction and testing of hovercraft models” (2002/2003)-Mechanical Power Eng. Dept., Faculty of Eng., Zagazig University, Zagazig, Egypt.
  • 30. “Design, construction and testing of wind pump models” (2002/2003)-Mechanical Power Eng. Dept., Faculty of Eng., Zagazig University, Zagazig, Egypt.
  • 31. “Investigation of the aerodynamic characteristics of a building complex” (2001/2002)-Mechanical Power Eng. Dept., Faculty of Eng., Zagazig University, Zagazig, Egypt.
  • 32. “Study of the add-on irregularities on the aerodynamic characteristics of airfoil sections” (2000/2001)-Mechanical Power Eng. Dept., Faculty of Eng., Zagazig University, Zagazig, Egypt.
  • 33. “Investigation of the aerodynamic interference between different building models” (2000/2001)-Mechanical Power Eng. Dept., Faculty of Eng., Zagazig University, Zagazig, Egypt.
  • 34. “Design and construction of a smoke tunnel” (2000/2001)-Mechatronics Eng. Dept., Faculty of Eng., October 6 University, October 6 City, Egypt.
  • 35. “Effect of add-on devices on road-vehicles aerodynamics” (1999/2000)-Mechanical Power Eng. Dept., Faculty of Eng., Zagazig University, Zagazig, Egypt.
  • 36. “Design and construction of a 3-D traverse mechanism on a wind tunnel for aerodynamics measurements” (1999/2000)-Mechatronics Eng. Dept., High Institute of Eng., October 6 University, October 6 City, Egypt.
  • 37. “Road-vehicles aerodynamics” (1998/1999) -Mechanical Power Eng. Dept., Faculty of Eng., Zagazig University, Zagazig, Egypt.
  • 38. “Design and construction of an educational wind tunnel” (1998/1999)-Mechatronics Eng. Dept., High Institute of Eng., October 6 University, October 6 City, Egypt.