Modeling the effect of shock unsteadiness in shock/ turbulent boundary-layer interactions
Modeling the effect of shock unsteadiness in shock/ turbulent boundary-layer interactions
复制标题
模拟激波/湍流边界层相互作用中激波不稳定的影响
DOI：
10.2514/1.8611
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发表时间：
2005
期刊：
影响因子：
2.5
通讯作者：
G. Candler
中科院分区：
文献类型：
--
作者：
K. Sinha;K. Mahesh;G. Candler
雷诺平均纳维尔-斯托克斯（RANS）方法通常无法正确预测激波/湍流相互作用。这可能是因为RANS模型没有考虑这些相互作用中固有的激波的非定常运动。以前的工作提出了激波非定常校正，显着提高了预测的湍流动能放大在均匀各向同性湍流的正激波。我们将修正推广到激波/湍流边界层相互作用，并在κ-e、κ-ω和Spalart-Allmaras模型中实现了它。与标准κ-e和κ-w模型相比，在压缩角流动中，修正减小了穿过激波的湍流动能放大。这导致了分离激波位置的改进的预测，延迟的再附着，以及斜坡上附面层的缓慢恢复。对于Spalart-Allmaras模型，这种修正放大了激波上的涡动粘性，使分离位置更接近实验。
Reynolds-averaged Navier-Stokes (RANS) methods often cannot predict shock/turbulence interaction correctly. This may be because RANS models do not account for the unsteady motion of the shock wave that is inherent in these interactions. Previous work proposed a shock-unsteadiness correction that significantly improves prediction of turbulent kinetic energy amplification across a normal shock in homogeneous isotropic turbulence. We generalize the modification to shock-wave/turbulent boundary-layer interactions and implement it in the κ-e, κ-ω, and Spalart-Allmaras models. In compression-comer flows, the correction decreases the turbulent kinetic energy amplification across the shock compared to the standard κ-e and κ-w models. This results in improved prediction of the separation shock location, delayed reattachment, and slower recovery of the boundary layer on the ramp. For the Spalart-Allmaras model, the modification amplifies eddy viscosity across the shock, moving the separation location closer to the experiment.