Analysis of unsteady behaviour in shockwave turbulent boundary layer interaction
Analysis of unsteady behaviour in shockwave turbulent boundary layer interaction
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DOI：
10.1017/jfm.2012.37
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发表时间：
2012-02
影响因子：
3.7
通讯作者：
M. Grilli;P. Schmid;S. Hickel;N. Adams
中科院分区：
文献类型：
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作者：
M. Grilli;P. Schmid;S. Hickel;N. Adams
摘要通过分析压缩膨胀斜坡上超音速湍流边界层的大涡模拟结果，研究了激波湍流边界层相互作用中的非定常行为。这种相互作用导致激波底部附近的极低频运动，其特征频率比入射边界层的典型频率低三个数量级。首先用傅里叶分析方法分析了壁面压力数据，突出了相互作用区域的低频现象。此外，通过动态模态分解分析了流动动力学，表明存在与分离泡脉动相关的低频模态，并伴随着激波的前后运动。
Abstract The unsteady behaviour in shockwave turbulent boundary layer interaction is investigated by analysing results from a large eddy simulation of a supersonic turbulent boundary layer over a compression–expansion ramp. The interaction leads to a very-low-frequency motion near the foot of the shock, with a characteristic frequency that is three orders of magnitude lower than the typical frequency of the incoming boundary layer. Wall pressure data are first analysed by means of Fourier analysis, highlighting the low-frequency phenomenon in the interaction region. Furthermore, the flow dynamics are analysed by a dynamic mode decomposition which shows the presence of a low-frequency mode associated with the pulsation of the separation bubble and accompanied by a forward–backward motion of the shock.