马赫数6柱-裙激波/边界层干扰直接模拟

高超声速激波/边界层干扰比超声速工况下具有更强的可压缩效应，再附之后会形成极高的局部力/热载荷，严重影响飞行器飞行安全。而激波/湍流边界层干扰区附近流动的三维特性使得流动更加复杂而难以预测。采用直接数值模拟对高超声速条件下的柱-裙激波/湍流边界层干扰进行了详细研究，特别是对Görtler涡结构对分离泡、物面压力和热流造成的展向差异开展了定性和定量分析。研究发现，干扰区附近的分离泡结构呈现出明显的三维效应，且Görtler涡展向分离位置截面的分离泡要明显小于再附位置，而这两个截面上分离泡的运动基本同步，没有明显的延迟或超前现象。物面压力和热流在展向出现显著的不均匀性，展向再附位置的平均压力和热流要比展向分离位置分别高13%和16.2%，脉动压力和热流比展向分离位置分别高28%和20%。截面流向速度特征正交分解结果显示两个位置上的能量都集中在剪切层附近，并且展向再附位置上低频模态占有更高的能量。在采用模态重构流场分析分离区面积发现，展向分离位置重构误差更小，而展向再附位置上的重构误差收敛更快。

Direct numerical simulation of shock wave/turbulent boundary layer interaction in hollow cylinder-flare configuration at Mach number 6

The compressibility effect in the hypersonic shock wave/boundary layer interaction is much stronger than that in the supersonic interaction, and after the reattachment, the high local pressure and thermal load will form, thereby significantly influencing the flight safety of vehicles. The three-dimensionality of the shock wave/boundary layer interaction further complicates the flow structures, making them more difficult to predict. In this study, a direct numerical simulation on the hypersonic shock wave/boundary layer interaction is performed. The effects of G rtler vortices on the separation bubble, the wall pressure and the heat flux are investigated both qualitatively and quantitatively. The investigation results indicate that the separation bubble exhibits obvious three-dimensionality and the size of the bubble at the spanwise separation location is significantly smaller than that at the spanwise reattachment location. The bubbles at the two locations change synchronously. The pressure and the heat flux exhibit inhomogeneous distribution in the spanwise direction. The mean pressure and the heat flux at the spanwise reattachment location are 13% and 16.2% higher than those at the spanwise separation locations, respectively. The ratios for the fluctuations of pressure and heat flux are 28% and 20% higher, respectively. The proper orthogonal decomposition analyses indicate that the energy concentrates on the shear layer above the bubble and the low-order modes at the spanwise reattachment occupy more energy than those at the separation location.