TY - JFULL AU - Samy M. El-Behery and Mofreh H. Hamed PY - 2009/6/ TI - A Comparative Study of Turbulence Models Performance for Turbulent Flow in a Planar Asymmetric Diffuser T2 - International Journal of Aerospace and Mechanical Engineering SP - 579 EP - 591 VL - 3 SN - 1307-6892 UR - https://publications.waset.org/pdf/12386 PU - World Academy of Science, Engineering and Technology NX - Open Science Index 29, 2009 N2 - This paper presents a computational study of the separated flow in a planer asymmetric diffuser. The steady RANS equations for turbulent incompressible fluid flow and six turbulence closures are used in the present study. The commercial software code, FLUENT 6.3.26, was used for solving the set of governing equations using various turbulence models. Five of the used turbulence models are available directly in the code while the v2-f turbulence model was implemented via User Defined Scalars (UDS) and User Defined Functions (UDF). A series of computational analysis is performed to assess the performance of turbulence models at different grid density. The results show that the standard k-ω, SST k-ω and v2-f models clearly performed better than other models when an adverse pressure gradient was present. The RSM model shows an acceptable agreement with the velocity and turbulent kinetic energy profiles but it failed to predict the location of separation and attachment points. The standard k-ε and the low-Re k- ε delivered very poor results. ER -