Investigations And Applications Of Detached Eddy Simulation

Detached-Eddy Simulation (DES) is a new approach to treatment of turbulence appeared several years ago. It combines the advantages of Reynolds-Averaged Navier-Stokes (RANS) method and Large-Eddy Simulation method (LES), and it is aimed at the prediction of massively separated flows at a manageable cost in engineering. Recently, a new dynamic grid method based on Delaunay graph mapping was also proposed, which makes the moving or deforming of viscous grid easier and faster if the boundaries are moving. Generally, moving boundaries will cause the flows massively separate. Thus, DES and the dynamic grid method based on Delaunay graph mapping had been combined to develop a code which can simulate the massively separated flows caused by moving boundaries. In this paper, the following works had been performed:(1) The Navier-Stokes equations had been numerically discreted by using the unstructured Cell-Centred finite volume scheme;(2) The dynamic grid method based on Delaunay graph mapping had been discussed in detail, and the code had been parallelized;(3) Several numerical examples with stationary boundaries or moving boundaries had been simulated by using the RANS method, and the validation of the code developed by us had been demonstrated;(4) The S-A based DES method had been used to simulate some massively separated flows, and the capabilities of DES had been investigated.