基于Helmholtz分解的航空声源项滤波
Aeroacoustic source term filtering based on Helmholtz decomposition
摘要：
混合航空声学方法寻求计算效率和稳健的噪声预测。利用已有的航空声波方程，我们提出了一种通用的混合航空声学方法，基于可压缩源数据。与目前最先进的航空声学类比的主要区别在于，使用额外的分解来计算航空声源项，并且基于可压缩流数据将其应用扩展到源制剂。通过在任意区域上应用Helmholtz-Hodge分解，我们提取了可压缩流模拟的不可压缩投影（非辐射基流）。该方法保持了混合气动声学方法的良好特性，同时考虑了对基流的可压缩影响。的能力说明了航空声学基准的情况下，“腔唇”，涉及声反馈。该研究是基于涡声方程，以纳入对流效应在波传播。
英文摘要：
Hybrid aeroacoustic methods seek for computational efficiency and robust noise prediction. Using already existing aeroacoustic wave equations, we propose a general hybrid aeroacoustic method, based on compressible source data. The main differences to current state of the art aeroacoustic analogies are that an additional decomposition is used to compute the aeroacoustic source terms and their application is extended to the source formulation, based on compressible flow data. By applying the Helmholtz-Hodge decomposition on arbitrary domains, we extract the incompressible projection (non-radiating base flow) of a compressible flow simulation. This method maintains the favorable properties of the hybrid aeroacoustic method while incorporating compressible effects on the base flow. The capabilities are illustrated for the aeroacoustic benchmark case, "cavity with a lip", involving acoustic feedback. The investigation is based on the equation of vortex sound, to incorporate convective effects during wave propagation.
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