Plenary Lecture
Boundary Layers Modeling for Turbulent Flow
Professor Sabah Tamimi
College of Engineering & Computing
AlGhurair University
Dubai, United Arab Emirates
E-mail: sabah@agu.ac.ae
Abstract: Due to the growth of technology which takes advantages of increasing computer speed and hardware capabilities, computational fluid dynamics (CFD) has become one of the most important fields in applied computer science as well as engineering, and due to numerous applications of CFD. Fluid dynamics has becomes the interest of many researches. It is well known that when a fluid enters a prismoidal duct the values of the pertinent variables change from some initial profile to a fully developed form, which is thereafter invariant in the downstream direction. Numerous theoretical and experimental works are available on laminar flow but in case of turbulent flow are still few. Since it has not been possible to obtain exact analytical solutions to such flows, an accurate numerical approach is needed. Therefore, an effective technique is required to model the variation of the pertinent variables near the solid boundary, where the variation in velocity and kinetic energy, in particular, is extremely large since the transfer of shear form the boundary into the main domain and the nature of the flow changes rapidly. Consequently, if a conversational finite element is used to model the N.W.Z., a significant grid refinement would be required. Several solution techniques have been suggested in order to avoid such excessive refinement. A more common approach is to terminate the main domain subject to discretisation at some small distance away from the wall, where the gradients of the independent variables are relatively small, and then use another technique to model the flow behavior in the near wall zone. The most traditional technique is the utilization of empirical universal laws. It is found that these laws are not valid in general, since these laws are really applicable for certain unidimensional flow regimes. Presently, a wall element technique, based on the use of the finite element method has been adopted and applied successfully for turbulent flow. This technique can be used with confidence and replaces other techniques. This lecture will present the validity of the wall element technique to simulate both developing and fully developed turbulent flow.
Brief Biography of the Speaker: SABAH TAMIMI earned his M.Sc. (Computer Science, 1988) and Ph.D. (Applied Computer Science, 1992), both degrees from University of Wales, UK. He is working continuously as a full-time academic faculty for more than 24 years at university level. In addition, the last 11 years, he has been involved in administrative sector working as Deputy Dean and Dean as well as faculty. He is currently an Associate Professor at the College of Engineering and Computing, AlGhurair University, United Arab Emirates. His interests are in computer modeling and simulation, computational flow dynamics, software testing techniques, computer graphics and databases. He has a very good number of publications in international journals and conferences, and reviewed many papers for international journals and conferences. Also, he is an editorial board member of different international journals.