Comparison of three large-eddy simulations of shock-induced turbulent separation bubbles
Comparison of three large-eddy simulations of shock-induced turbulent separation bubbles
复制标题
DOI：
10.1007/s00193-009-0222-x
复制
发表时间：
2009-08
期刊：
影响因子：
2.2
通讯作者：
E. Touber;N. Sandham
中科院分区：
文献类型：
--
作者：
E. Touber;N. Sandham
本文对斜激波与超音速湍流边界层的相互作用进行了三种不同的大涡模拟研究。所有的模拟都使用了相同的入流技术，特别是为了避免激波/边界层干扰系统可能出现的低频干扰。所有的模拟都是在相对较宽的计算域上进行的，并且在大于最常报告的低频冲击振荡周期的25倍的时间上进行积分，从而可以在时间平均和低频动态水平上进行比较。结果证实了以前的实验结果，这表明一个简单的线性关系之间的相互作用长度和冲击强度，如果缩放使用边界层厚度和壁面剪应力。所有测试的情况下，显着的低频冲击运动的证据。在壁面处，主要在相互作用的初始部分，观察到高能低频压力波动。
Three different large-eddy simulation investigations of the interaction between an impinging oblique shock and a supersonic turbulent boundary layer are presented. All simulations made use of the same inflow technique, specifically aimed at avoiding possible low-frequency interferences with the shock/boundary-layer interaction system. All simulations were run on relatively wide computational domains and integrated over times greater than twenty five times the period of the most commonly reported low-frequency shock-oscillation, making comparisons at both time-averaged and low-frequency-dynamic levels possible. The results confirm previous experimental results which suggested a simple linear relation between the interaction length and the oblique-shock strength if scaled using the boundary-layer thickness and wall-shear stress. All the tested cases show evidences of significant low-frequency shock motions. At the wall, energetic low-frequency pressure fluctuations are observed, mainly in the initial part of interaction.