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分别采用基于两方程k-ω剪切应力输运(SST)湍流模型的延迟DES(DDES)、更改的DDES(MDDES)和改进的DDES(IDDES)方法,并引入可压缩修正,结合三阶MUSCL-Roe和五阶WENO-Roe两种空间离散格式,针对超声速底部的复杂流动现象,开展了数值模拟研究。计算结果表明本文方法能够捕捉到超声速底部流动中丰富的湍流结构,通过分析计算结果对超声速底部的流动机理有了进一步的认识,为下一步的超声速底部流动减阻改进和雷诺平均NavierStokes/大涡模拟(RANS/LES)方法在非定常高可压缩性流动中的应用提供了参考。通过对比分析不同空间离散格式的计算结果研究了数值耗散对计算的影响,五阶WENO-Roe格式的计算结果与实验结果吻合良好;对不同RANS/LES混合方法的计算结果进行了对比分析,结果表明IDDES方法在近壁区的表现优于DDES和MDDES方法。
The delayed DES (DDES), modified DDES (MDDES) and modified DDES (IDDES) methods based on turbulence model of two-equation k-ω shear stress transport (SST) are respectively adopted and compressible correction is introduced. Combined with the third order MUSCL -Roe and the fifth-order WENO-Roe discrete spatial format, aiming at the complex flow phenomenon at supersonic bottom, a numerical simulation was carried out. The calculation results show that the method can capture the rich turbulent structure in supersonic bottom flow and further understand the flow mechanism at the bottom of supersonic flow through the analysis and calculation results. This is helpful for the next step of supersonic bottom flow drag reduction and Renault mean NavierStokes / The simulation (RANS / LES) method provides a reference for the application of unsteady high compressible flow. The results of the fifth-order WENO-Roe scheme are in good agreement with the experimental results by comparing the computational results of different spatial discrete schemes with the numerical results of different spatial discrete schemes. The results of different RANS / LES hybrid methods are compared and analyzed. The results show that the IDDES method performs better than the DDES and MDDES methods in the near wall.