Adaptive partitioning-based discrete unified gas kinetic scheme for flows in all flow regimes

Advances in Aerodynamics

卷:5

Research

L. C. Han¹  L. M. Yang²  Y. Y. Liu³  C. Shu³  H. Ding⁴  Z. H. Li⁵ 

[1] Department of Aerodynamics, College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, 210016, Nanjing, China;

[2] Department of Aerodynamics, College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, 210016, Nanjing, China;State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, 210016, Nanjing, China;Key Laboratory of Unsteady Aerodynamics and Flow Control, Ministry of Industry and Information Technology, Nanjing University of Aeronautics and Astronautics, 210016, Nanjing, China;

[3] Department of Mechanical Engineering, National University of Singapore, 117576, Singapore, Singapore;

[4] Department of Modern Mechanics, University of Science and Technology of China, 230027, Hefei, China;

[5] National Laboratory for Computational Fluid Dynamics, Beihang University, 100191, Beijing, China;

关键词: Boltzmann-BGK equation;    Discrete unified gas kinetic scheme;    Adaptive partitioning;    Discrete characteristic solution;    All flow regimes;   

DOI  :  10.1186/s42774-023-00142-4

 received in 2022-12-17, accepted in 2023-02-03,  发布年份 2023

来源: Springer

【 摘 要 】

To improve the efficiency of the discrete unified gas kinetic scheme (DUGKS) in capturing cross-scale flow physics, an adaptive partitioning-based discrete unified gas kinetic scheme (ADUGKS) is developed in this work. The ADUGKS is designed from the discrete characteristic solution to the Boltzmann-BGK equation, which contains the initial distribution function and the local equilibrium state. The initial distribution function contributes to the calculation of free streaming fluxes and the local equilibrium state contributes to the calculation of equilibrium fluxes. When the contribution of the initial distribution function is negative, the local flow field can be regarded as the continuous flow and the Navier–Stokes (N-S) equations can be used to obtain the solution directly. Otherwise, the discrete distribution functions should be updated by the Boltzmann equation to capture the rarefaction effect. Given this, in the ADUGKS, the computational domain is divided into the DUGKS cell and the N-S cell based on the contribution of the initial distribution function to the calculation of free streaming fluxes. In the N-S cell, the local flow field is evolved by solving the N-S equations, while in the DUGKS cell, both the discrete velocity Boltzmann equation and the corresponding macroscopic governing equations are solved by a modified DUGKS. Since more and more cells turn into the N-S cell with the decrease of the Knudsen number, a significant acceleration can be achieved for the ADUGKS in the continuum flow regime as compared with the DUGKS.

【 授权许可】

CC BY   
© The Author(s) 2023

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