define "yplus" in custom field function in fluent
when I want to compute y+ in fluent it computed for the first layer only. so how can I define y+ in CFF I Know the law of y+=y*ut/kin.visc
but what the Y means in fluent how can I define anyone can help? |
Yplus
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Yplus plot
It depends on your objective. No one plots vs from CFD since the graph is actually input to CFD. If you want to do it, you have to write a UDF and it won't be easy. The graphs that you see in books is based on experimental data and there is no benefit of regenerating it using CFD. If you are trying to do it for verification, then you have to either come up with a way to separate wall shear from turbulence shear or do multiple simulation with different velocities so that both, and , change for each case.
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the last point. Would you recommend using the periodic boundary conditionز I actually used it but I need your opinion |
Periodic BC
That depends on the simulation. Periodic condition exists because it is useful but the usage is based on whether the physics and geometry, both, are periodic or not.
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Good
That's an appropriate use of translational periodicity.
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Correct
Yes, that's correct choice.
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Adaption
Mesh adaption is process to refine (or coarsen) the mesh in specific regions. If you already have the mesh that can resolve the required fields, then you don't need to worry about mesh adaption. Mesh adaption is one of the least used approach in most of the simulations.
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delta t= (CFL*mesh size/velocity) |
Cfl
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thank you very much
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https://drive.google.com/file/d/1Lhn...ew?usp=sharing
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https://drive.google.com/file/d/1Lhn...ew?usp=sharing |
Mesh
I am afraid I cannot access Google Drive. So, better to attach a few pictures here in the post.
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1 Attachment(s)
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this is a mesh |
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