Assessment of turbulence models for the simulation of turbulent flows past bluff bodies

摘要

The accuracy of a recently developed one-equation turbulence model in predicting complex flows with massive separation is assessed against the well-known Spalart Allmaras (SA) and the k-omega-SST-Scale Adaptive Simulation (SAS) models. The unsteady 3-D flow past a square cylinder at Re=2.2 x 10(4), as well as a 3-D flow over a wall-mounted cube at Re=4.0 x 10(4) are computed and compared to available experimental data. The recently developed model is capable of resolving turbulent flow structures, thereby predicting all major unsteady phenomena with a marked improvement over other Reynolds average Navier-Stokes (RANS) models. The computational time required by the model in comparison to that required by Large Eddy Simulation (LES) renders it a suitable candidate for simulating 3D unsteady complex engineering flows such as building aerodynamics with reasonable accuracy. (C) 2016 Elsevier Ltd. All rights reserved.