Evaluation of Detached Eddy Simulation for Turbulent Wake Applications

Simulations of a low-speed square cylinder wake and a supersonic axisymmetric base wake are performed using the Detached Eddy Simulation (DES) model. A reduced-dissipation form of the Symmetric TVD scheme is employed to mitigate the effects of dissipative error in regions of smooth flow. The reduceddissipation scheme is demonstrated on a 2D square cylinder wake problem, showing a marked improvement in accuracy for a given grid resolution. The results for simulations on three grids of increasing resolution for the 3D square cylinder wake are compared to experimental data and to other LES and DES studies. The comparisons of mean flow and global flow quantities to experimental data are favorable, while the results for second order statistics in the wake are mixed and do not always improve with increasing spatial resolution. Comparisons to LES studies are also generally favorable, suggesting DES provides an adequate subgrid scale model. Predictions of base drag and centerline wake velocity for the supersonic wake are also good, given sufficient grid refinement. These cases add to the validation library for DES and support its use as an engineering analysis tool for accurate prediction of global flow quantities and mean flow properties.