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  3. How to avoid unphysical pressure spikes at several points during the simulation using an incompressible fluid in a closed domain?

How to avoid unphysical pressure spikes at several points during the simulation using an incompressible fluid in a closed domain?

Tagged: 17.2, compressible-flow, Convergence Problems, fluent, fluid-dynamics, General
    • January 25, 2023 at 7:16 am
      FAQFAQ
      Participant

      An incompressible ideal gas isn’t suitable for simulation in a closed domain. By switching to a compressible gas, the pressure spikes are avoided. Using Ideal Gas instead of constant density gases gives a more stable solution. For a given interface displacement, an incompressible fluid responds with a higher pressure change than a compressible one. Even if the constant density assumption is valid for the converged solution, it can lead to divergence while iterating.

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