Numerical Simulation of Two-Dimensional Turbulent Separated and Reattaching Flows Using Reynolds Averaged-Navier Stokes (RANS) Model in Order to Find the Best Mesh and Near-Wall Treatment

Abstract

In this work we have studied numerically the flow around a two-dimensional (2D) cubic obstacle using of the technique of computational fluids dynamics (CFD) for a Reynolds number Re=40450 based on the bulk velocity and the cannel height. The objective of this study is to evaluate the performance of different turbulence models. For the simulation of turbulent wind flow using the Navier-Stokes equation. We considered five models of turbulence, namely standard k-e model, realizable k-e model, RNG k-e model, standard k-ω model and SST k-ω model. The evaluation is based on the comparison of predicted with those obtained experimentally CEDVAL A1-3, Exp. [33]. The experimental results were produced in a wind tunnel the metrological Institute of Hamburg University. Our main objective in this study is to find the appropriate turbulence model for the simulation of complex flow in the presence of reattachment and separation. Adequate meshes have been used to meet the critical required by each turbulence model.