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An Optimized Multi-block Method for Turbulent Flows
Authors: M. Goodarzi, P. Lashgari
Abstract:A major part of the flow field involves no complicated turbulent behavior in many turbulent flows. In this research work, in order to reduce required memory and CPU time, the flow field was decomposed into several blocks, each block including its special turbulence. A two dimensional backward facing step was considered here. Four combinations of the Prandtl mixing length and standard k- E models were implemented as well. Computer memory and CPU time consumption in addition to numerical convergence and accuracy of the obtained results were mainly investigated. Observations showed that, a suitable combination of turbulence models in different blocks led to the results with the same accuracy as the high order turbulence model for all of the blocks, in addition to the reductions in memory and CPU time consumption.
Keywords: Computer memory, CPU time, Multi-block method, Turbulence modeling.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1078651Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 1470
 Weatherill N.P, and forsey C. R., "Grid Genaration and Flow calculation for Complex Aircraft Geometries Using a Multi-Block Scheme", AIAA Paper, 85, 1985.
 Jae Wook Kim, and Duck Joo Lee., "Characteristic Interface Conditions for Multiblock High-Order Computation on singular Structured Grid", AIAA Journal, Vol. 41, No. 12, pp.2341-2348, 2003.
 Epstein B, Rubin T, and Seror S., "Accurate Multiblock Navier - Stokes Solver for Complex Aerodynamic Configurations", AIAA Journal, Vol. 41, No. 4, pp. 582-593, 2003.
 Drikakis D., "A Parallel Multiblock Characteristic-Based Method for Three-Dimensional Incompressible Flow", Advances in Engineering Software, Vol. 26, pp.111-119, 1996.
 Di Serafino Daniela., "A Parallel Implementation of a Multigrid multiblock Euler Solver on Distributed Memory Machines", parallel Computing, Vol. 23, pp. 2095-2113, 1997.
 Tsai H.M, Wong A.S.F, Cai J, and Liu F., "Unsteady Flow calculations with a parallel Multiblock Moving Mesh Algorithm", AIAA Journal, Vol. 39, No. 6, pp.1021-1029, 2001.
 Atkins H.L., "A Multi-block Multigrid Method for the Solution of the Euler and Navier - stokes Equations for Three Dimensional Flows", AIAA Paper, 91, 101, 1991.
 Prandtl L., "├£ber Die Ausgebildete Turbulenz", ZAMM, Vol. 5, pp. 136- 139, 1925.
 Launder B.E, and Spalding D.B., "The Numerical Computation of Turbulent Flow", Comput. Methods Appl. Mech. Eng, Vol. 3, pp. 269- 289, 1974.
 Rhie CM, Chow WL. "Numerical Study of the Turbulent Flow Past an Airfoil with Trailing Edge Separation". AIAA J. 1983; 21: 1525-1532.
 Kim J, Kline S.J and Johnston J.P., "Investigation of a Reattaching Turbulent Shear Layer: Flow over a Backward-Facing Step", J. Fluid Eng., ASME Trans, Vol. 102, pp. 302-308, 1980.
 Hackman P.L, Raithby G.D and Strong A.B., "Numerical Predication of Flows Over Backward Facing Step by a Finite Element Method; Comparison with Finite Volume Solutions and Experiments", Int. J. Numer. Methods Fluids, Vol. 4, pp. 711-724, 1984.