Evaluation of an industrial CFD code for LES applications

The feasibility of using an industrial compressible CFD code for large eddy simulations (LES) is evaluated. Dynamic subgrid scale (SGS) models developed at CTR have been implemented into the code and tested in a fully developed turbulent channel flow. In order to evaluate the effects of the SGS model compared with the numerical dissipation inherent in the upwind-biases schemes, computations without any SGS model were also carried out. It is found that the effect of dynamic SGS model decreases with increasing numerical dissipation (low order schemes). The 9th and 11th order schemes have relatively small numerical dissipation, and thus the dynamic SGS model plays useful role. In addition, a wall model was implemented in conjunction with LES. Although the velocity profile obtained with the wall model agrees well with the full LES solution, the magnitude of the pressure fluctuation is found to be overpredicted.