SIMULATION OF VORTEX SHEDDING PAST A SQUARE CYLINDER WITH DIFFERENT TURBULENCE MODELS

This paper presents the results of numerical simulations of vortex she dding past a free-standing square cylinder at Re-D = 22000, obtained w ith different turbulence models. Using wall functions, the standard k- epsilon model is compared with a modification suggested by Kato and La under (Proc. 9th Symp. Turbulent Shear Flows, Kyoto, 10-4-1 (1993)). I n addition, both versions are used in a two-layer approach, in which t he flow close to the cylinder is computed with a locally more suitable one-equation turbulence model and only outside the viscous near-wall layer with the two mentioned high-Re model versions. To allow a compar ison, the simulations are performed first using the same computational domain and boundary conditions as in previous investigations. Then re sults are presented that were obtained on a computational domain and w ith boundary conditions more suitable for a comparison with the experi ments. (C) 1998 John Wiley & Sons, Ltd.