论文标题
基于Helmholtz分解的空气声源术语过滤
Aeroacoustic source term filtering based on Helmholtz decomposition
论文作者
论文摘要
混合气声方法寻求计算效率和稳健的噪声预测。使用已经存在的空气声波方程，我们根据可压缩的源数据提出了一种一般的混合气声方法。与最新的气声类比的当前状态的主要区别在于，基于可压缩的流数据，使用额外的分解来计算空气源术语，并将其应用扩展到源公式。通过在任意域上应用Helmholtz-Hodge分解，我们提取了可压缩流量模拟的不可压缩投影（非辐射基基流）。该方法维持混合气声方法的有利特性，同时对基本流动构成了可压缩作用。涉及声音反馈的空气声基准案例“腔”，说明了这些功能。该研究基于涡旋声音的方程，以在波传播过程中纳入对流效果。
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.
