March 23, 2023 at 1:44 amw BCSubscriber
Hello, the simulation model I built use density-based, SST K-w model, the material used in my model is real-gas-nist, the inlet and outlet pressure boundary conditions, and the operating pressure is 0.The maximum Mach number calculated by the pressure base model is 0.8.I would like to know how to solve the hybrid initialization calculation done, but fluent can't continue anything.
March 23, 2023 at 1:57 pmRobAnsys Employee
Hybrid initialisation is failing, or something is/isn't happening after hybrid initialisation? If the operating pressure is zero what are the boundary pressures set as?
March 24, 2023 at 3:20 amw BCSubscriber
The model is an air valve, which has only one inlet and one outlet. The inlet is set as 0.4MPa for pressure inlet and 0.04MPa for pressure outlet.
March 24, 2023 at 3:27 amw BCSubscriber
Thank you for your response. I found that when I set the material to water vapor, the initialization was done and I could continue. Is it because I set the material to real-gas-nist and I didn't set the boundary conditions properly?How should I set the corresponding boundary conditions？
March 24, 2023 at 11:19 amRobAnsys Employee
Boundary conditions are just that, the values at the boundries. The initial conditions are also exactly that, they are the cell values at that instant. If you set the whole domain at 0.4MPa what's stopping the region downstream of the valve trying to flow to 0.04MPa instantly?
March 24, 2023 at 12:21 pmw BCSubscriber
The valve acts like a faucet, with the spool blocking the flow
March 24, 2023 at 1:31 pmRobAnsys Employee
Yes, but now plot t=0 and tell me what the flow is going to do.
March 24, 2023 at 2:04 pm
March 24, 2023 at 3:10 pmRobAnsys Employee
And the CFD fields at that time?
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