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Flow simulation with compressible gas but at higher flow rate something always goes wrong.

Question asked by Bence Rivasz on Feb 2, 2018
Latest reply on Feb 6, 2018 by Bence Rivasz

Hi, im doing a flow simulation with compressible gas (air) but at higher flow rate something always goes wrong.

Until about 7 l/min everything looks good, the pressure start convergence, ∆P is about 0,5 bar what looks realistic, but over 8 l/min the pressure goes up

independently from the initial Flow rate, and keep the raising  until i stop the simulation manually. (so its hard to belive that ~15% more flow can make infinite pressure)

With more flow so like 10-15 l/min the different is only that the pressure goes up faster.

I tried to refine the mesh or rerun it with a bigger environment (longer inlet and the outlet as a big box) but the result is always the same.

Can someone help about about explain this difficulties and how to solve them?

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