​​Investigation into the modelling ability of a hybrid anisotropic K-omega SST/STM for the Onera M6 wing and DNS lab channel flow validation cases​

Abstract

​​The chosen turbulence model for a RANS based computational fluid dynamics simulation is crucial for accurate CFD results. Many strong models exist such as the K-omega SST, K-epsilon and Spalart Allmaras turbulence models however, each of these models makes a major assumption which in nature is profoundly incorrect. Most commercially available turbulence models assume that the Reynolds stress tensor is isotropic, when in reality any shear, rotational or wall bounded flows are anisotropic in nature. This paper aims to investigate a newly proposed anisotropic hybrid K-omega SST / stochastic turbulence model developed by Könözsy The model has been tested for two validation cases: an Onera M6 transonic test case and a traditional channel flow case. Data has been plotted and compared to experimental data and DNS data and good alignment was found for both cases between the two data sets. The model outperforms the K-omega SST in its physical modelling however does still need some refinement in its model constants approach as shown by its anisotropic Reynolds stress modelling for the channel flow case.​