help - Running Converging Diverging Nozzle with a shock wave
Hi!
I have recently started to work with fluent using the tutorial in the link: https://confluence.cornell.edu/displ...ow+in+a+Nozzle They solved the nozzle problem for the case the flow is supersonic in all the nozzle with no shocks. I have succeeded to recapture their results. Next I tried (independently) to solve the same geometry with a higher outlet static pressure to get (theoretically) a shock wave in the diverging section of the nozzle. The total pressure at the inlet is atmospheric (101325 Pascal). I tried to input several outlet pressure: 20,000 Pa, 30,000 Pa and such and after running the program the solution didn't converge and I didn't get any good results (the residuals went up instead of down) My question is, What could be the cause for this divergence? As I said, theoretically, A shock wave should occur. Does it require any special attention? setup settings or meshing.. etc. Could it be that the divergence occurs due to a too coarse mesh? (I was told that the mesh in the tutorial is quite coarse) Thanks ahead , Daniel |
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