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首页> 外文期刊>The Aeronautical Journal >Prediction of acoustic resonance phenomena for weapon bays using detached eddy simulation
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Prediction of acoustic resonance phenomena for weapon bays using detached eddy simulation

机译：基于分离涡模拟的武器舱声共振现象预测

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摘要

It is argued that acoustic resonance phenomena in open cavities such as weapons bays cannot be adequately predicted through numerical solution of Reynolds averaged Navier-Stokes (RANS) equations. The requirement to resolve the growth of the shear layer instability from the lip of the cavity inevitably implies that turbulence further downstream is resolved while also being modelled thus making RANS over dissipative. Large eddy simulation (LES) models only unresolved scales and a hybrid method combining RANS near walls with LES in the cavity appears a practical alternative to pure RANS. This paper compares computations of the M219 cavity configuration made with unsteady RANS and with the hybrid method known as detached eddy simulation (DES). It is shown that whilst unsteady RANS and DES give very similar predictions for the 1st and 3rd modes of the acoustic resonance the 2nd mode (which is dominant near the centre of the cavity) is absent in the RANS results but well predicted by DES. The 2nd mode is thought to arise from an interaction with vortical structures in the shear layer which are suppressed in the highly dissipative RANS method. The 4th mode, which is much weaker than the other three modes, is over-predicted by DES and under-predicted by a smaller amount in RANS.
机译：有人认为，通过雷诺平均Navier-Stokes（RANS）方程的数值解不能充分预测诸如武器舱之类的开放腔中的声共振现象。解决从腔体边缘解决剪切层不稳定性增长的要求不可避免地意味着解决了下游的湍流，同时也对其进行了建模，从而使RANS耗散了。大涡模拟（LES）仅对未解决的比例进行建模，将壁附近的RANS与腔中的LES相结合的混合方法似乎是纯RANS的一种实用替代方案。本文比较了用非稳态RANS和称为“分离涡流仿真（DES）”的混合方法对M219腔结构进行的计算。结果表明，尽管不稳定的RANS和DES对声共振的第一和第三模式给出了非常相似的预测，但是RANS结果中没有第二模式（在腔中心附近占主导），但DES对其进行了很好的预测。认为第二模式是由于与剪切层中的旋涡结构的相互作用而产生的，该相互作用在高耗散的RANS方法中被抑制。第四模式比其他三种模式要弱得多，它由DES预测过度，而在RANS中预测较少。

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