Simulations of subsonic vortex-shedding flow past a 2D vertical plate in the near-continuum regime by the parallelized DSMC code |
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| Authors: | KC Tseng TC Kuo SC Lin CC Su JS Wu |
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| Affiliation: | 1. National Space Organization, National Applied Research Laboratories, Hsinchu Science Park, Hsinchu, Taiwan;2. Department of Mechanical Engineering, National Chiao Tung University, 1001 Ta-Hsueh Road, Hsinchu, Taiwan;3. National Center for High-Performance Computing, National Applied Research Laboratories, Hsinchu Science Park, Hsinchu, Taiwan;1. School of Aerospace Engineering, Huazhong University of Science and Technology, 430074 Wuhan, China;2. School of Aeronautic Science and Engineering, Beihang University, Beijing 100191, China;3. State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, 430074 Wuhan, China |
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| Abstract: | A general-purpose Parallel Direct Simulation Monte Carlo Code, named PDSC, is used to simulate near-continuum subsonic flow past a 2D vertical plate for studying the vortex-shedding phenomena. An unsteady time-averaging sampling method and a post-processing procedure called DREAM (DSMC Rapid Ensemble Averaging Method) have also been implemented, reducing the overall computational expense and improving the sampling quality of time-dependent flow problems in the rarefied flow regime. Parametric studies, including the temporal variable time step (TVTS) factor, the number of particles per cell, the domain size, and the Reynolds number, have been conducted, obtaining the Strouhal number and various aerodynamic coefficients of the flow. Results are compared to experimental data in the continuum regime available in the literature, demonstrating the capacity of PDSC and DREAM to simulate near-continuum vortex-shedding problems within acceptable computational time. |
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