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Disturbance in the transonic region using the PR_GAS fluid model |
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June 16, 2022, 16:25 |
Disturbance in the transonic region using the PR_GAS fluid model
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Hello !
I have been trying to run the NICFD nozzle case of the tutorials with CO2 instead of MDM, using the Peng-Robinson equation of state. However, I get some disturbance near the wall, that eventually cause the simulation to crash. I have run a few tests and this is what I was able to deduce: -The disturbance occurs when the flow is transonic/supersonic, not if the flow stays subsonic. -The disturbance does not appear when an Euler wall condition is imposed, but it appears when a heat-flux (no slip) condition is imposed. -It does not appear when using the ideal gas model. -It will appear either with a non structured mesh or a structured one. -It appears even if y+ < 1 -It will occur even at low CFL numbers (smaller than 1) when using the Euler implicit scheme. -It does not seem to occur when using the Euler explicit scheme, though I still have to make tests to be 100% sure. Has anyone experienced such kind of issue before? |
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