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Relaxation time simulation method with internal energy exchange for perfect gas flow at near-continuum conditions
Institution:1. Department of Mechanical Engineering, The Johns Hopkins University, Baltimore, MD 21218, USA;2. Centre for Hypersonics, School of Engineering, University of Queensland, Brisbane 4072, Australia;3. Department of Engineering Mechanics, School of Aerospace, Tsinghua University, Beijing 100084, PR China;1. High Performance Computing (HPC) Laboratory, Department of Mechanical Engineering, Ferdowsi University of Mashhad, 91775-1111, Mashhad, Iran;2. Department of Mechanical Engineering, University of Victoria, Victoria, British Columbia, Canada;1. Department of Aerospace Engineering, Center of Excellence in Aerospace Systems, Sharif University of Technology, P.O. Box 11365-11155, Tehran, Iran;2. Institute for Nanoscience and Nanotechnology, Sharif University of Technology, P.O. Box 11365-11155, Tehran, Iran
Abstract:This paper presents an internal energy exchange scheme for the relaxation time simulation method (RTSM) which solves the BGK equation for the perfect gas flow at near-continuum region discrete rotational energies are introduced to model the relaxation of internal energy modes. This development improved the agreements between RTSM and DSMC with little additional computational cost. The result shows a possibility of an improved hybrid RTSM/DSMC code for the continuum/rarefied gas flow.
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