In low Mach number aeroacoustics, the well-known disparity of scales allows applying hybrid simulation models using different meshes for flow and acoustics, which leads to a fast computational procedure. The hybrid workflow of the perturbed convective wave equation involves three steps: (1) perform unsteady incompressible flow computations on a subdomain; (2) compute the acoustic sources and (3) simulate the acoustic field, using a mesh specifically suited. These aeroacoustic methods seek for a robust, conservative and computational efficient mesh-to-mesh transformation of the aeroacoustic sources. In this paper, the accuracy and the application limitations of a cell-centroid-based conservative interpolation scheme is compared to the computationally advanced cut-volume cell approach in 2D and 3D. Based on a previously validated axial fan model where spurious artifacts have been visualized, the results are evaluated systematically using a grid convergence study. To conclude, the monotonic convergence of both conservative interpolation schemes is demonstrated. Regarding arbitrary mesh deformation (for example, the motion of the vocal folds in human phonation), the study reveals that the computationally simpler cell-centroid-based conservative interpolation can be the method of choice.

中文翻译：

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使用低马赫数混合气动声学工作流程的保守源插值方法的应用限制

在低马赫数气动声学中，众所周知的尺度差异允许应用混合仿真模型，使用不同的网格进行流动和声学，从而实现快速计算过程。扰动对流波动方程的混合工作流程包括三个步骤：（1）在子域上进行非定常不可压缩流动计算；(2) 计算声源和 (3) 使用特别适合的网格模拟声场。这些气动声学方法寻求气动声源的稳健、保守和计算高效的网格到网格转换。在本文中，将基于单元质心的保守插值方案的准确性和应用限制与 2D 和 3D 中计算先进的切割体积单元方法进行了比较。基于先前验证的轴流风扇模型，其中虚假伪影已可视化，使用网格收敛研究系统地评估结果。总之，证明了两种保守插值方案的单调收敛性。关于任意网格变形（例如，人类发声中声带的运动），该研究表明，计算上更简单的基于细胞质心的保守插值可以是选择的方法。