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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2019, Vol. 40 ›› Issue (8): 122726-122726.doi: 10.7527/S1000-6893.2018.22726

• Fluid Mechanics and Flight Mechanics • Previous Articles     Next Articles

γ-Reθ transition model based on IDDES frame

YI Miaorong, ZHAO Huiyong, LE Jialing, XIAO Baoguo, ZHENG Zhonghua   

  1. Science and Technology on Scramjet Laboratory, China Aerodynamics Research and Development Center, Mianyang 621000, China
  • Received:2018-10-15 Revised:2018-11-02 Online:2019-08-15 Published:2018-12-24
  • Supported by:
    National Natural Science Foundation of China (51676204);FengLei Youth Innovation Fund of CARDC (PJD20170134)

Abstract: The improved γ-Reθ transition model for hypersonic flow has the disability of capturing the disturbances in forced transition. To solve the problem, the RANS (Reynolds Averaged Navier-Stokes) framework is modified to IDDES (Improved Delayed Detached Eddy Simulation)frameworks. The new method can not only simulate the natural transition in the γ-Reθ model but also simulate the forced transition process precisely by capturing more details in disturbances in the IDDES methods. The results of a series of natural transition of simple geometry cases and the roughness induced transition in a Mach number 6 flat plate show that the new method has the advantages of both the γ-Reθ model and the IDDES methods. When simulating the natural transition, the influence rules on transition of important parameters such as Reynolds number and leading edge radius could be correctly reflected. When simulating the forced transition, the formation, development, and breakdown processes of the streamwise vortexes induced by the roughness element could be also captured.

Key words: transition model, IDDES, hypersonic, natural transition, forced transition

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