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脱体涡模拟方法(DES,Detached Eddy Simulation)由于结合了湍流模型(RNAS,Reynolds Averaged Navier-stokes)和大涡模拟(LES,Large Eddy Simulation)两者各自优势,是模拟非定常大分离流动的有效方法.采用基于SA(Spalart-Allmaras)湍流模型的DES方法,对高超声速返回舱外形进行数值模拟,计算所得的返回舱表面压力及热流分布与实验结果吻合,证实了DES方法的优越性.最后,在DES方法中加入可压缩修正,结果证实在高超声速流动中,可压缩修正方法在一定程度上能够提高原始模型的预测性能.
Detached Eddy Simulation (DES), which combines the advantages of both Reynolds Averaged Navier-Stokes (RDS) and Large Eddy Simulation (LES) to simulate unsteady large-scale isolated flows And the effective method.The DES method based on SA (Spalart-Allmaras) turbulence model was used to simulate the shape of hypersonic return capsule.The calculated surface pressure and heat flow distribution in the capsule were in good agreement with the experimental results, which proved the superiority of DES method. Finally, compressibility correction was added to the DES method. The results show that the compressibility correction method can improve the predictive performance of the original model to a certain degree in hypersonic flow.