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Sixth International Symposium on Turbulence and Shear Flow Phenomena
June, 22-24, 2009 , Seoul National University, Seoul, Korea

DOI: 10.1615/TSFP6

IMPROVING COST-EFFECTIVENESS OF LES BY USING NON-REFLECTING BOUNDARY CONDITIONS: THE FLOW AROUND SIMPLIFIED ICE2 TRAIN

pages 1185-1190
DOI: 10.1615/TSFP6.1890
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RÉSUMÉ

The importance of having proper open or outflow boundary conditions for the calculation domain is a known issue in Computational Fluid Dynamics (CFD) for a long time and some recent developments were done originally without having Large Eddy Simulation (LES) applications in mind. An impact of it on LES results is even greater than in the case of some other modelling approaches due to the number of vortices which may pass through the outflow boundary. The flow may enter and leave the computational domain at the same time and at the same boundary. In such circumstances, it is important that numerical implementation of boundary conditions enforces certain physical constraints. This paper evaluates recently proposed non-reflecting boundary conditions on improving costeffectiveness of LES calculations by reducing calculation domain and with that, also reducing the number of calculation cells which by the rule leads to a shorter computational time. The results will be shown for the flow around simplified ICE2 high-speed train subjected to a constant cross wind used in the previous work of Hemida and Krajnovic (2009).

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