| Citation: | SONG H Q，ZHANG K L，MA M，et al. Theory and performance research of DES and DDES in turbulent separation[J]. Journal of Beijing University of Aeronautics and Astronautics，2023，49（9）：2482-2492 （in Chinese） doi: 10.13700/j.bh.1001-5965.2021.0653
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With the increasing complexity of flow structure in engineering, detached eddy simulation (DES) has become one of the most effective methods for turbulence simulation. DES is a hybrid method, combining Reynolds averaged Navier-Stokes (RANS) and large eddy simulation (LES) and thus possessing the high efficiency of RANS and high prevision of DES. This research focuses on DES and delayed detached eddy simulation (DDES), analyzing the differences in the structure of shielding functions, and the action mechanism of delay factors. Backward step flow and supersonic cavity compression corner flow are selected to compare and analyze the solving ability of DES and DDES. The results show that DDES protects the RANS solution area by introducing the delay factor, improving modeled-stress depletion and reducing the sensitivity to
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