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Direct computation of the noise induced by a turbulent flow through a diaphragm in a duct at low Mach number

机译：直接计算低马赫数下通过管道中膜片的湍流引起的噪声

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摘要

A direct computation of the noise radiated by a turbulent flow in a duct obstructed by a diaphragm is performed by compressible large-eddy simulation. For the low Mach number configuration considered, a two-step hybrid method could be less expensive, but would fail at characterizing sound-flow interactions. The application of direct calculation is thus challenging but gives both the acoustic and aerodynamic fields in the same computation in order to shed light on the noise generation mechanisms. Acoustic energy is produced and dissipated in the asymmetric jet-type flow issuing from the diaphragm. A low-frequency radiation is correlated with the breakdown of the coherent jet-column structures as the plane jet reattaches the upper wall. The Kelvin-Helmholtz vortices in the shear layers of the jet constitute the primary instabilities but do not radiate sound. On the contrary, this vorticity shedding seems to dissipate waves propagating upstream by enforcing the unsteady Kutta condition.
机译：通过可压缩的大涡流模拟，可以直接计算由膜片阻塞的管道中的湍流辐射出的噪声。对于考虑的低马赫数配置，两步混合方法可能较便宜，但无法表征声流相互作用。因此，直接计算的应用颇具挑战性，但在同一计算中同时给出了声场和空气动力场，以阐明噪声产生机理。从膜片发出的非对称射流产生并消散了声能。当平面射流重新附着上壁时，低频辐射与相干射流柱结构的破坏相关。射流剪切层中的开尔文-亥姆霍兹涡流构成了主要的不稳定性，但不辐射声音。相反，这种涡流的散布似乎通过执行不稳定的Kutta条件而消散了向上游传播的波。

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