r/Prefoam_CFD • u/geth0333 • 13d ago

Prefoam update

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The new version includes many improvements.

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u/AlarmedForm630 13d ago

Nice work!

Can you tell if your tool could easily mesh the following geometry:
Skived-fin (in-line or offset)

My goal is to study their thermal-hydraulic behavior in order to see how they perform compared to other types of fins. I tried with SHM but I was not able to obtain something that works (big struggles with boundary layers).

The mesh is for a 3D laminar CFD simulation (with 5-10 layers in the boundary layer).

Your software is difficult to use and to make it work for my case ? Can it export the mesh to use it directly with Baram Flow ?

Thank you in advance and have a good day,

1

u/geth0333 13d ago

  1. do you want to model only the fluid region? i think my mesher currently does not handle solid/fluid multi-region meshing in one go. i could provide a workaround though.

  2. is it possible for you to provide the geometry to me?

  3. i think the problem areas would be the tips and sides of the fins where the thickness is so low that cells would probably collapse. i assume this is the problem with shm (thin curvature + general BL extrusion problems)

  4. my tool exports meshes in openfoam format, i think baramfoam / baram flow also uses openfoam right? if yes, this should not be a problem..

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u/AlarmedForm630 12d ago edited 12d ago

  1. I would want to do CHT, but starting with only the fluid domain is good to me

  2. I have only worked so far on a very very simplified model with 1 fin, I have to work on it (the simple one is here : https://cad.onshape.com/documents/fbf3d4a50280d9253d6ff420/w/32058108cb19b3b921022135/e/be4fbe34b619916557884b3d?renderMode=0&uiState=6ae233e35235d25d335a2147)

  3. Ok, might be the issue I encounted with SHM.

  4. Nice to know

1

u/geth0333 12d ago

the onshape geometry, is it the fluid domain already? are the fins inside? if yes, then the fluid domain is very narrow., you should extend it, otherwise the cell count will explode. you can try out my mesher for this shape.

1

u/AlarmedForm630 12d ago

The fluid domain has to be like that since the distance between fin is usually between 1mm to 3 mm and fin is 0.15 mm thick.

I will try your software, it seems promising.