Compressible Euler equations

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I want to model the 1D inviscid compressible Euler equations without using the predefined physics node.

I have three PDEs: - for density rho: - for velocity u: - for temperature T:

Using the EOS, the pressure term in the velocity equation can be rewritten into

Instead of using the Compressible Euler Equations node, I have added three General Form PDE nodes. Unfortunately, COMSOL throws the "Repeated error test failures. May have reached a singularity." error. What can be the cause of this?


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