Applying embedded hybrid RANS/LES method to channel flow

As compared with traditional global hybrid RANS/LES method, embedded hybrid RANS/LES method does not treat the whole field as different RANS or LES regions automatically based on the turbulence model itself or whether the mesh is fine or not. It is aimed to embed any LES part to the background RANS flow artificially so that the interface between RANS and LES is set vertically to the streamwise direction and the extra resolved turbulence information in the interface can be easily and rationally added. That means, it can not only make sure that LES controls the flow principles totally in the regions of complex flow phenomena but also avoid the pollution from RANS and overcome the delay of resolved turbulence in LES regions. In this paper channel flow is divided into upstream RANS and downstream LES regions, and SST-DES is used as the basic hybrid model, together with the additional turbulent fluctuations generated from synthetic eddy method in the interface, which finally lead to a satisfactory simulation.