期刊
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
卷 373, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cma.2020.113438
关键词
Semi-implicit; Body force; Prediction-correction; CAA; Moving boundaries
资金
- Natural Science Foundation of China (NSFC) [51790514, 51706006]
- China Scholarship Council (CSC) [201806020045]
This paper presents a semi-implicit immersed boundary body force model to directly predict the fluid-induced sound from moving objects. A prediction-correction technique is used to overcome the conflict of grid quality and efficiency in high-order computational aeroacoustics methods. The results show that the model is effective in predicting interaction noise.
In this paper, a semi-implicit immersed boundary body force model is derived from the compressible Navier-Stokes equations, to directly predict the viscous flow-induced sound from moving objects on a fixed Cartesian grid. To overcome the conflict of grid quality with efficiency in simulating moving-boundary problems with high-order computational aeroacoustics methods, a prediction-correction technique is utilized. This accurately satisfies no-slip wall boundary conditions at every time step without any feedback treatment. A particular contribution of the work is the introduction of a numerical model equation to analyze the body force convergence. This is useful to pre-evaluate the generated Cartesian and body-surface grids. Several benchmark aeroacoustic problems are simulated to validate the present model. Results show that the unsteady force and far-field sound directivity agree well with the previous direct numerical simulation results. The work further suggests that the developed body force model/CAA methods are capable of predicting interaction noise, especially those associated with oscillating multiple objects. (C) 2020 Elsevier B.V. All rights reserved.
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