FW-H方程积分面选取对圆柱绕流噪声计算预报结果的影响分析

Study on Effects of Integral Surface Parameters of FW-H Equation on Noise Prediction of Turbulent Flows around Cylinder

圆柱作为简单钝体,其绕流容易发生流动分离,涡脱落比较明显且具有强周期性,是典型的噪声预报研究对象。圆柱绕流可作为立管和锚链等工程装备研究的基础,该文采用分离涡模拟(Detached eddy simulation,DES),使用naoe-FOAM-SJTU求解器,模拟了二维圆柱绕流湍流流动,基于流声比拟方程分别比较了物面积分与可穿透积分面积分、不封闭可穿透积分面与封闭可穿透积分面的结果,并研究了积分面长度和宽度的最佳配置。该文设置了三个噪声测点,对测点处的压力进行快速傅立叶变换,得到声压级频谱结果,以获得最佳水动力噪声可穿透积分面配置,为提高水动力噪声预报精度奠定了基础。

A cylinder is a simple blunt body,and water flow through the cylinder is prone to flow separation.At this time,the vortex shedding is obvious and has strong periodicity,which is a typical noise prediction research object.The flow around a cylinder can serve as the foundation for research on engineering equipment such as risers and anchor chains.In this paper,the Detached Eddy Simulation(DES)and the naoe-FOAM-SJTU solver is applied to simulate the turbulent flow of two-dimensional cylinders.Based on the Lighthill equation,the patch surface,the porous surface,unclosed porous surface and closed porous surface are respectively compared.The optimal parameter settings for length and width are studied.Three probes are set,and the application of FFT on the sound pressure at the probes obtains the spectrum results of the sound pressure levels.So as to get the optimal hydrodynamic noise porous integral surface configuration,which lays the foundation for improving the accuracy of hydrodynamic noise prediction.