NUMERICAL AND MODELING INFLUENCES ON LARGE-EDDY SIMULATIONS FOR THE FLOW PAST A CIRCULAR-CYLINDER

In the present work the turbulent Row past a circular cylinder (Re = 3 900) was computed by large eddy simulation (LES). The objective was no t to investigate the physical phenomena of this Row in detail but to s tudy numerical as well as modeling aspects which influence the quality of LES solutions. Concerning the numerical method the most important component is the discretization of the non-linear convective fluxes. F ive different schemes were investigated. Moreover, the influence of di fferent grid resolutions was examined. On the modeling side two aspect s play an important role, namely the near-wall model and the subgrid s cale (SGS) model. Owing to the restriction to a low Reynolds number in this study, no-slip boundary conditions were used at solid walls. Hen ce only the second aspect was taken into account. Two different subgri d scale models (Smagorinsky and dynamic model) were applied. Additiona lly, LES computations without any subgrid scale modeling were carried out in order to prove the performance of the above mentioned SGS model s. (C) 1998 Elsevier Science Inc. AV rights reserved.