With the development of the computational capability, Computational Fluid Dynamics (CFD) is used more and more for design and safety issues related to reactor thermal hydraulics. A series of CFD codes have been developed and utilized to analyze the reactor thermal hydraulics behavior. GASFLOW-MPI is a well-validated parallel scalable CFD software and has been widely utilized to predict the complex physical phenomena in nuclear power plant containment. Furthermore, the simulation results are well accepted by the nuclear authorities in several countries all over the world. Turbulent mixing is a basic but important issue for thermal hydraulics safety analysis. In order to capture more unsteady turbulent information under the acceptable computational cost, the LES and RANS hybrid turbulent model Detached Eddy Simulation (DES) model has been developed in the CFD code GASFLOW-MPI. In this paper, two typical turbulent cases are simulated and compared with the experimental data to validate the DES model. The first case is the turbulent backward-facing step flow which is a well-known turbulent benchmark. The second case is a hydrogen turbulent jet which is a typical turbulent flow for hydrogen combustion risk evaluation in nuclear containment. The numerical results show that the averaged flow profiles agree well with the experimental data.

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