Abstract: DES(Detached Eddy Simulation)is the hybrid method combining with the RANS and LES to simulate the flow-field with detached eddies. The main idea is that, near the wall, the RANS is used and in the other field the LES method is used. In this paper, the DES method is used to simulate the complicate turbulence flow-fields on hybrid unstructured grids and the Osher scheme is used for the spatial discretisation. Many cases(flows past blunt body, Delta wing, aircraft and missile with lateral jets) are used to validate this method. All the results demonstrate that the DES method is very efficient for the simulation of the separated turbulence flow-fields.

Key words: turbulence model, LES, DES, hybrid grid, upwind scheme