Mode interactions of a high-subsonic deep cavity

Mode interactions of a high-subsonic deep cavity
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高亚音速深腔模态相互作用

DOI:
10.1063/1.4983368
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发表时间:
2017-05
期刊:
影响因子:
4.6
通讯作者:
Adams Nikolaus A.
Adams Nikolaus A.
中科院分区:
工程技术2区
文献类型:
--
作者:
Chen Zhenli;Adams Nikolaus A.

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为了了解实验中与隧道壁和腔体振荡相关的声学模式的相互作用,采用隐式大涡模拟和自适应局部反褶积方法研究了在有和没有上隧道壁的情况下,长深比L/D = 0.42的高亚音速深腔的流动。随着分辨率的增加,隧道上壁的模拟结果与实验结果收敛较好。然而,在没有隧道上壁的模拟中,流动收敛到不同的平均状态。采用基于内存高效快照算法的动态模式分解(DMD)方法对模式交互进行分析。发现可以出现几乎为零的上游和下游辐射的几乎被捕获的全球模式。在流场的DMD模态中,可以观察到捕获模态、腔内声共振模态和剪切层模态的相互作用。
To understand the interactions of the acoustic modes associated with the tunnel walls and the cavity oscillations in the experiment, flows over a deep cavity having a length-to-depth ratio L/D = 0.42 at high subsonic speeds with and without an upper tunnel wall were investigated by using an implicit large-eddy simulation with an adaptive local deconvolution method. The results of the simulations with the upper tunnel wall converge well to the experimental results as the resolution increases. However, in the simulations without the upper tunnel wall the flow converges to a different mean state. The mode interactions were analyzed by using a Dynamic Mode Decomposition (DMD) method based on a memory-efficient snapshot algorithm. It was found that nearly trapped global modes, which have almost zero upstream and downstream radiation, can occur. The interactions of the trapped modes, the acoustic resonant modes in the cavity, and the shear-layer modes can be observed in the DMD modes of the flow with the upper ...
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