Possibility of using Ansys to simulate free molecular flow

    • MIsen

      I would like to ask if someone knows whether it is possible to use Ansys to simulate particle behaviour in free molecular flow (Knudsen number >10), or not?

    • Kishan Konannavar
      Ansys Employee


      The underlying Navier-stokes equation in Ansys Fluent uses continuum approach. At such high Kn numbers the numerical accuracy of the solution may not be acceptable.

      Thank you





    • Rob
      Ansys Employee

      What is the purpose of the models? Particles in a vacuum can be modelled, but you need to mess with the carrier fluid to reduce (remove) drag. Do NOT set density and viscosity as zero though, it'll do interesting things to the solver. 

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