We propose a segregated Finite Volume (FV) - Spectral Element Method (SEM) for modelling aeroacoustic phenomena based on the Lighthill's acoustic analogy. First the fluid solution is computed employing a FV method. Then, the sound source term is projected onto the acoustic grid and the inhomogeneous Lighthill's wave equation is solved employing the SEM. The novel projection method computes offline the intersections between the acoustic and the fluid grids in order to preserve the accuracy. The proposed intersection algorithm is shown to be robust, scalable and able to efficiently compute the geometric intersection of arbitrary polyhedral elements. We then analyse the properties of the projection error and we numerically assess the obtained theoretical estimates. Finally, we address two relevant aeroacoustic benchmarks, namely the corotating vortex pair and the noise induced by a laminar flow around a squared cylinder, to demonstrate in practice the effectiveness of the proposed approach. The flow computations are performed with OpenFOAM , an open-source finite volume library, while the inhomogeneous Lighthill's wave equation is solved with SPEED, an open-source spectral element library.
翻译:我们提议了一种分离的极量(FV)-光量元素法(SEM),用于根据光丘的声学类比模拟大气声学现象。首先,液溶液用FV方法计算。然后,将声源术语投射到声电网,用SEM解决不相容的光荷波等方程式。新颖的投影法将声学和流体格之间的交叉点从线上计算出来,以保持准确性。拟议的交叉算法显示是稳健的、可伸缩的,并且能够有效地计算任意的多元元素的几何交叉点交叉点。然后我们分析投影错误的特性,并从数字上评估获得的理论估计。最后,我们处理两个相关的气源学基准,即电离电离电离电动对子和由方圆柱形圆柱形圆柱状流引发的噪音,以便在实际中显示拟议方法的有效性。流动计算方法与开放源的OpenFOMAM进行,这是一个开放源的有限量库库,而无源的光质光流波波波波成,而开放的图书馆的Sho数-sl-slormol-slormall-sl-sl-sldal-slorml-slormldal-sldal-slalgalgalgalgal-sl) 等解解解。