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CFD of air flow through convergent-divergent nozzle |
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September 10, 2024, 07:02 |
CFD of air flow through convergent-divergent nozzle
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#1 |
New Member
Fteddy
Join Date: Aug 2024
Posts: 3
Rep Power: 2 |
Hello,
I have recently started using OpenFoam for internal fluid dynamics simulations. Specifically, I am simulating the flow of compressed air through a convergent-divergent nozzle by imposing a pressure difference (6 bar) between the primary inlet and the outlet, see link https://imgur.com/TEfdhyb.png From theory, I know that this is not the correct field. I can also compare it with the solution obtained from a very reliable commercial software, which I am sharing the link to here https://imgur.com/YvQNi8S.png I would be very grateful if any expert could help me improve this solution. If needed, I can attach excerpts from the 0, constant, and system folders. |
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September 16, 2024, 05:12 |
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#2 |
Member
Join Date: May 2024
Location: France
Posts: 35
Rep Power: 2 |
Could you post those files? It's important to see what boundary conditions you are imposing in OF and in the commercial software to determine whether they are comparable
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October 8, 2024, 07:49 |
Case files or setup strategy
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#3 |
New Member
Skill-Lync CFD
Join Date: Sep 2024
Location: Chennai
Posts: 21
Rep Power: 2 |
If you can provide insight into the setup, it would be helpful. We'd need to check the boundary conditions to provide resolution. Compressible solvers might be inducing diffusion, we would advise you check the mesh as well.
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October 23, 2024, 10:31 |
BC and setup files
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#4 | ||
New Member
Fteddy
Join Date: Aug 2024
Posts: 3
Rep Power: 2 |
Quote:
Quote:
I usually check the minumum orthogonal quality. In this case is, effectively, quite low (<0.1) and I know that could be a problem. But: 1- the region affected by problematic mesh cells was little 2-the simulation ran the same thus, I proceeded. Do you think this has been such a drastic impact on the final result? I think that this is not the point and that there is some setting (initialization of fields or solvers) wrong. But I don't know what. If you could help me I would be very grateful I attach the files (BC and setup of both Ansys and OF) you asked for. |
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