This study employs a numerical approach to investigate noise mechanisms in tandem cylinders. The tandem cylinder configuration is an excellent model for aircraft landing gear. The study is therefore primarily motivated by the need to understand the aircraft landing gear as a primary contributor to airframe noise during approach and landing. Fluctuations in the flow properties induced by turbulent flow around the tandem cylinders are computed and analyzed. A hybrid improved delayed detached eddy simulation turbulence model is employed to compute the boundary layer flow as well as to compute the fluctuations in the flow properties. The numerical methodologies for the turbulent flow computations are implemented on the OpenFOAM software platform. The study also considers the impact of neglecting the volume sources and employs two modified versions of Curle's and Ffowcs-Williams and Hawkings analogies. The results are in good agreement with published numerical and experimental data in the existing literature.

中文翻译：

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使用混合 Reynolds 平均 Navier-Stokes/大涡模拟方法的计算气动声学建模和修正的声学类比

本研究采用数值方法来研究串联气缸中的噪声机制。串联气缸配置是飞机起落架的绝佳模型。因此，这项研究的主要动机是需要将飞机起落架理解为进场和着陆期间机身噪声的主要贡献者。计算和分析由围绕串联圆柱体的湍流引起的流动特性的波动。采用混合改进的延迟分离涡模拟湍流模型来计算边界层流动以及流动特性的波动。湍流计算的数值方法是在 OpenFOAM 软件平台上实现的。该研究还考虑了忽略体积源的影响，并采用了 Curle 和 Ffowcs-Williams 和 Hawkings 类比的两个修改版本。结果与现有文献中已发表的数值和实验数据非常吻合。