Adaptively switched time stepping scheme for direct aeroacoustic computations

Hsuehjui Lu, Chunggang Li, Makoto Tsubokura

研究成果: Article同行評審

1 引文 斯高帕斯(Scopus)


The physical variables involved in a flow field are of very different scales to those of the aeroacoustic field within the flow. Thus, direct aeroacoustic computations (DACs) require extremely small time steps to capture the fluctuations in the aeroacoustic field and stabilize the numerical scheme. As a result, the computation time for DACs can be very long. This paper describes an implicit Adaptively Switched Time Stepping (ASTS) scheme that enables the use of larger time steps when solving DAC problems. ASTS is based on the adaptive selection of the time stepping scheme according to the value of the residual. Early in the iteration process, an artificial time term is used to afford larger time steps while ensuring that the numerical scheme remains stable. Once the residual is less than some preset reference value, the artificial time term is removed, thus eliminating the Newton linearization error. Simulation results show that ASTS can reduce the computational cost of DACs by a factor of more than eight while maintaining the required level of accuracy.

期刊AIP Advances
出版狀態Published - 2022 3月 1

All Science Journal Classification (ASJC) codes

  • 物理與天文學 (全部)


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