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Old   February 21, 2011, 08:50
Default Transient flow solver
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Hi all, got an annoying problem here. I started looking into CFD because I want to model particles in a low pressure flow. After doing some research I've found that the Knudsen number of the flow is somewhere between 1 and 10, which is a difficult area to solve. Does anyone know of any programs or methods that can solve in this regime?

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Old   March 1, 2011, 10:34
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I'm currently investigating in the same field. So although I'm looking for answers myself, I can give you a short list of methods and implementations that look at least promising:

  • Particle methods: based on the kinetic theory with reduced number of particles
    • Discrete-Element-Method: see link for implementations; LAMMPS has a direct simulation monte carlo for low-density gases module
    • Corpuscular Method: LS-DYNA (mainly used for airbag inflation; a few publications available if you google for it (esp. by Lars Olovsson)
  • Lattice Boltzmann Methods: see link for implementations; reported problematic for high mach numbers

Hope that helps.
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Old   March 1, 2011, 11:03
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Thanks for the reply Christian. I also found this paper which outlines some method for studying rarefied gas flow, http://www.nist.gov/data/PDFfiles/jpcrd540.pdf.

I'm currently using Star-CCM+ to study the particles in the continuum regime. This should help me find the best way to continue with my problem.
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Old   March 2, 2011, 06:58
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Thanks for the link to the paper. Since I want to study the gas flow through apertures it is very helpful.
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