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[FAQ]

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.