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Volume 40 Issue 3
Mar.  2014
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Journal of Beijing University of Aeronautics and Astronautics  > 2014  >  40(3): 389-393.
Tang Zhenyu, Cai Guobiao. Comparison analysis between two continuum breakdown parameters applied in coupled NS-DSMC method[J]. Journal of Beijing University of Aeronautics and Astronautics, 2014, 40(3): 389-393. doi: 10.13700/j.bh.1001-5965.2013.0252(in Chinese)
Citation: Tang Zhenyu, Cai Guobiao. Comparison analysis between two continuum breakdown parameters applied in coupled NS-DSMC method[J]. Journal of Beijing University of Aeronautics and Astronautics, 2014, 40(3): 389-393. doi: 10.13700/j.bh.1001-5965.2013.0252(in Chinese)
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Comparison analysis between two continuum breakdown parameters applied in coupled NS-DSMC method

doi: 10.13700/j.bh.1001-5965.2013.0252

  • School of Astronautics, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

  • Received Date: 10 May 2013
  • Publish Date: 20 Mar 2014
    Abstract
  • Navier Stokes-direct simulation Monte Carlo (NS-DSMC) coupled method is a principal method for the computation of continuum-rarefied transitional gas flows. How to locate the interface between continuum and rarefied domains is one of the key aspects in using this method, which is generally achieved by applying a continuum breakdown parameter. To choose the continuum breakdown parameter more reasonably, theoretical analysis and comparisons were carried out for two major continuum breakdown parameters: KnQ and B, which show that they have similar mathematical forms to a certain extent, although they are established from different basis. Numerical test was conducted by using an over-cylinder flow problem which also indicates the relationship between them. KnQ and B parameters have few differences when applied in NS-DSMC coupled method, except that KnQ parameter has a widely used threshold value of 0.05, but the threshold value of B parameter will vary for different flows.

     

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