Profile Details

Create Project

★★★★★

☆☆☆☆☆

USD 40 /hr

★★★★★

☆☆☆☆☆

Hire Dr. Ghazi B.

Tunisia

USD 40 /hr

Assistant Professor Researcher | modeling and simulating complex turbulent single and multiphase flows - CFD approach

Profile Summary

I am Assistant Professor and Researcher in Hydraulic Engineering with more than 10 years of experience. After finishing my PhD in cotutel, which has been conducted jointly between Institut National Polytechnique de Toulouse - INPT (France) and Ecole Nationale d’Ingenieurs de Tunis - ENIT (Tunisia), I have started working at ENIT in Tunisia. My didactic activities are focused on teaching courses of Applied Fluid Mechanics (including compressible flows), Computational Fluid Dynamics and Turbulence Modeling for Mechanical, Civil, Aeronautical and Hydraulic engineers as well as supervising multitude of practical projects in a wide spectrum of industrial fields. On the other hand, my research activities have been focused on turbulent multiphase flows modeling and simulating. Such research thematic involve several issues including turbulence modeling in multiphase flows taking into account interfacial interactions as well as modeling of interfacial transfers of mass, momentum and energy. My rich academic and research background allowed me, at first step, to produce many research works published in scientific journals with impact factor. The main target of such research may be roughly summarized as the validating of new proposed closures for Eulerian two-fluid model. When implemented in CFD tools, such proposed closures have succeeded to improve numerical simulations and notably give more realistic behavior to simulated two-phase dispersed flows in several industrial processes. to get more deep idea about my researches, I invite the interested reader to visit my personal page in the website : www.researchgate.net At second step, such background allowed me to carry out with success, in collaboration between my team and partner industrial actors, many huge practical projects such as : • Environmental impact study of nuclear plant installation in Tunisia : Modeling of the atmospheric dispersion of radioactive emissions as well the dispersion of cooling water in marine environment. • Environmental impact study of an operating process of methane dissolved in deep water in lake Kivu (in Republic Democratic of the Congo, Africa). This study has been achieved by carrying out 3D Hydrodynamic modeling of the stratified structure of the lake using CFD approach and simulating of such operating process impact. • Modeling and simulating of oil spill induced by offshore petroleum installation in Mediterranean Sea. At more little characteristic length scales, may be cited as examples : • Optimizing of Transformer Vault cooling process by means of natural convected air using CFD approach. • Optimizing of the aeration process in a waste water treatment reactor by means of millimetric bubbles injection. This study has been achieved using CFD two-phase flow simulations including the simulation of the local dissolved oxygen concentration in water induced by mass interfacial transfer. • Optimizing of the cleaning process of an oil well using CFD approach. This study has been achieved by means of CFD two-phase flow simulations of the non-Newtonian drilling mud fluid laden with cuttings. The experience achieved through my research and development activities allowed me to acquire skills for analyzing of involved physical mechanisms, academic and technical reports writing as well as simple and efficient communication. At another level, it allowed me to get a methodological way of approaching projects. Hence, for a given new project, conversation with partner as members of a unique team (either by mails or by direct communications) should be so useful to better precise the goals of project and plan a strategic approach to reach them. About computing and software skills, my background has allowed me to get operational experience within using a wide spectrum of numerical tools including : • Commercial CFD codes : ANSYS (CFX, FLUENT, Workbench, etc) ; PHOENICS • Open source CFD code : OpenFOAM • Commercial CAD and meshing codes : Pointwise ; SolidWorks • Hydraulic engineering codes : EPANET ; EPA SWMM ; HEC-RAS • Handmade programming code in Fortran, Matlab, Python

Subject Matter Expertise

• ★ Computational Fluid Dynamics
• ☆ Hydraulic Engineering
• ☆ Heat Transfer & Calorimetry
• ☆ Fluid Mechanics

Services

• Writing
• Research
• Consulting

Writing Technical Writing

Research Gray Literature Search, Systematic Literature Review, Secondary Data Collection

Consulting Scientific and Technical Consulting

Work Experience

Assistant Professor

National Engineering School of Tunis

September 2007 - Present

Assistant in Hydraulic Engineering

National Engineering School of Tunis

September 2004 - August 2007

Assistant in Physics

Applied Biological Sciences Superior Institute of Tunis

September 2003 - August 2004

Assistant in Physics

Preparatory Institute of Engineering Studies of Nabeul

September 1999 - August 2002

Education

PHD/Doctor (Civil Engineering)

National Engineering School of Tunis

September 2001 - March 2005

PHD / Doctor

National Polytechnic Institute of Toulouse

September 2001 - March 2005

Master Degree Diploma, Specialty: Hydraulic Engineering

National Engineering School of Tunis

September 1996 - January 1999

License Degree, specialty : Fundamental Physics

Mathematical Physics and Natural sciences Faculty of Tunis

September 1994 - June 1996

Certifications

• Certification details not provided.

Publications

JOURNAL ARTICLE

Aroua Aouadi and Ghazi Bellakhal and Jamel Chahed(2022). Combined Effects of the Turbulence and Interfacial Momentum Transfer on Two-Phase Turbulent Bubbly Flows . Journal of Fluids Engineering. 144. (9). {ASME} International

Mariem Rezig and Ghazi Bellakhal and Jamel Chahed(2022). On turbulence and interfacial momentum transfer in dispersed gas-liquid flows: Contribution of bubbly flow experiments under microgravity conditions . International Journal of Multiphase Flow. 147. p. 103903. Elsevier {BV}

(2020). EFFECT OF FLOW CONFINEMENT ON THE DRAG FORCE COEFFICIENT IN HOMOGENEOUS BUBBLY FLOW AT MODERATE VOLUME FRACTION. Multiphase Science and Technology.

(2020). Assessment of turbulence models for bubbly flows: Toward a five-equation turbulence model . Chemical Engineering Science.

(2019). First and Second Order Turbulence Closures Applied to Homogeneous Turbulent Bubbly Flows . Journal of Applied Fluid Mechanics.

(2019). One-way coupling of WRF with a Gaussian dispersion model: a focused fine-scale air pollution assessment on southern Mediterranean. Environmental Science and Pollution Research.

(2019). Effect of the turbulent contribution of the interfacial momentum transfer on the bubbles dynamics and void fraction distribution in vertical bubbly jets . International Journal of Multiphase Flow.

(2017). Bubbles’ slip velocity reduction in the near wall region of turbulent bubbly pipe flows under different gravity conditions . Chemical Engineering Research and Design.

Rezig, M., Bellakhal, G., Chahed, J.(2017). Phase distribution in dispersed liquid–liquid flow in vertical pipe: Mean and turbulent contributions of interfacial force . AIChE Journal. 63. (9). p. 4214-4223.

Kanfoudi, H., Bellakhall, G., Ennouri, M., Bel Hadj Taher, A., Zgolli, R.(2017). Numerical analysis of the turbulent flow structure induced by the cavitation shedding using LES . Journal of Applied Fluid Mechanics. 10. (3). p. 933-946.

Ayeb Mrabtini, H., Bellakhal, G., Chahed, J.(2017). Analysis of the homogeneous turbulence structure in uniformly sheared bubbly flow . Nuclear Engineering and Design. 320. p. 112-122.

Chahed, J., Aouadi, A., Rezig, M., Bellakhal, G.(2016). The Phenomenon of Bubbles Negative Relative Velocity in Vertical Bubbly Jets . Journal of Fluids Engineering, Transactions of the ASME. 138. (12).

(2011). Gas Dispersion in Air-Lift Reactors : Contribution of the Turbulent Part of the Added Mass Force . AIChE Journal.

(2004). Analysis of the turbulence statistics and anisotropy in homogeneous shear bubbly flow using a turbulent viscosity model . Journal of Turbulence.