July 17, 2023 at 2:13 pmAshwin Subramanian MuruganSubscriber
Hello, Im trying to simulate the shock train in a supersonic inlet. I have attached a picture of my mesh.
Inlet - Pressure inlet - Total Pressure = 207Kpa, Static Pressure = 42Kpa (Mach 1.7) Total temp = 310K
Outlet - Pressure outlet - Static pressure = 1 Pa
Im supposed to get a nice series of shocks in the duct. However when I run the simulation, I find that initially the shock forms, with more iterations the location of the shock moves towards the inlet and disappears, Once it disappears the solution converges immediately.
How do I solve this problem?
July 17, 2023 at 5:29 pmFederico Alzamora PrevitaliSubscriber
Which solver are you using? Pressure or Density-based? Which Solution methods and discretization schemes are you using?
can you show us a contour plot for the pressure? If you can, please include a snapshot of the intermediate solution (with the shocks) and the final solution.
July 18, 2023 at 4:44 amAshwin Subramanian MuruganSubscriber
Hello, Thank you for your reply.
I am using the pressure based solver with coupled method and 2nd order discretization schemes. I also tried the density based solver, but it seems to take a lot more iterations to get to the same point.
After 150 iterations:
Kindly help, thanks.
July 18, 2023 at 5:26 amAshwin Subramanian MuruganSubscriber
Hello, thank you for your reply.
I am using the pressure-based solver with coupled method and 2nd-order discretization schemes. I have also tried the density-based solver, but it seems to take many more iterations to get to the same point.
I have attached the contour plots and residuals.
Also, after the shock disappears, the inlet becomes subsonic, which is not what I set.
After fmg initialization:
after 150 iterations:
After 300 iterations:
After 500 :
Kindly help, Thanks
July 18, 2023 at 1:13 pmFederico Alzamora PrevitaliSubscriber
What are your operating conditions?
Given your boundary conditions, are you sure that the nozzle exit is not choked?
July 18, 2023 at 2:14 pmAshwin Subramanian MuruganSubscriber
Operating pressure = 0 Pa
I’m referring a research paper that has experimental data. The outlet was connected to a vacuum pump so that’s why I set the outlet pressure to close to 0. How do I fix this? So I don't think it is choked.
July 19, 2023 at 4:55 amAshwin Subramanian MuruganSubscriber
Hello everyone, Any suggestions would be really helpful, Thanks.
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