A hybrid method for aeroacoustic computation of moving rigid bodies in low Mach number flows

IF 2.2 3区 工程技术 Q2 MECHANICS
Kai Wang, Tiangui Ye, Xueren Wang, Guoyong Jin, Yukun Chen
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引用次数: 0

Abstract

To analyze the noise induced by moving rigid structures in low Mach number flows, acoustic governing equations based on the viscous/acoustic splitting method and the arbitrary Lagrangian–Eulerian method are rigorously derived. In order to resolve the numerical instability generated in a non-uniform mean flow, the modified viscous/acoustic method, based on the filtering method, is developed. The acoustic equations are transformed into the same form as the incompressible flow equations by introducing the acoustic co-velocity and solved based on a collocated grid finite volume method. An approach for solving acoustic equation based on the PIMPLE algorithm is presented and computed in open-source computational fluid dynamics software OpenFOAM, which brings down communication costs and speeds up computing efficiency. Furthermore, the source term decomposition is extended to study the noise generated by each source term in a motion grid. Several examples including stationary and moving meshes have been designed to prove the accuracy of this approach. Finally, the aerodynamic and acoustic properties for the flow past a transversely oscillating cylinder at Re = 200, Ma = 0.2 in lock-in and non-lock-in regions is present.

Abstract Image

Abstract Image

低马赫数流动中运动刚体的气动声学计算混合方法
为了分析低马赫数流动中移动刚性结构引起的噪声,基于粘性/声学分裂方法和任意拉格朗日-欧勒方法严格推导了声学控制方程。为了解决在非均匀平均流中产生的数值不稳定性,开发了基于滤波法的改进粘滞/声学方法。通过引入声学共速,将声学方程转换为与不可压缩流动方程相同的形式,并基于同网格有限体积法进行求解。提出了一种基于 PIMPLE 算法的声学方程求解方法,并在开源计算流体力学软件 OpenFOAM 中进行计算,从而降低了通信成本,提高了计算效率。此外,还扩展了源项分解,以研究运动网格中每个源项产生的噪声。为了证明这种方法的准确性,我们设计了几个包括静止和运动网格在内的示例。最后,介绍了在 Re = 200、Ma = 0.2 的锁定和非锁定区域内,流过横向摆动圆柱体的气动和声学特性。
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来源期刊
CiteScore
5.80
自引率
2.90%
发文量
38
审稿时长
>12 weeks
期刊介绍: Theoretical and Computational Fluid Dynamics provides a forum for the cross fertilization of ideas, tools and techniques across all disciplines in which fluid flow plays a role. The focus is on aspects of fluid dynamics where theory and computation are used to provide insights and data upon which solid physical understanding is revealed. We seek research papers, invited review articles, brief communications, letters and comments addressing flow phenomena of relevance to aeronautical, geophysical, environmental, material, mechanical and life sciences. Papers of a purely algorithmic, experimental or engineering application nature, and papers without significant new physical insights, are outside the scope of this journal. For computational work, authors are responsible for ensuring that any artifacts of discretization and/or implementation are sufficiently controlled such that the numerical results unambiguously support the conclusions drawn. Where appropriate, and to the extent possible, such papers should either include or reference supporting documentation in the form of verification and validation studies.
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