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simpleFoam convergence issue on turbulent sim (yPlus) |
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June 2, 2024, 15:57 |
simpleFoam convergence issue on turbulent sim (yPlus)
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Santi Parera
Join Date: Jul 2019
Location: BARCELONA
Posts: 26
Rep Power: 7 |
Hey there,
I want to simulate a Venturi pipe with a geometry a little bit complex. Fluid is water and Reynolds is fully turbulent. For now I'm working on a simplified geometry that consists just in two pipes forming a T. This is my workflow: 1. Solve for 1000 cPs (laminar) - linearUpwind, converges perfectly 2. Solve for 100 cPs (laminar) using previous data - linearUpwind, converges perfectly 3. Solve for 10 cPs (turbulent) using previous data - upwind, converges perfectly 4. Solve for 10 cPs (turbulent) using previous data - linearUpwind, does not converge 5. Solve for 1 cPs (turbulent) using previous data - upwind 6. Solve for 1 cPs (turbulent) using previous data - linearUpwind As you can see, I cannot overpass point 4 because it does not converge... Mesh is done by blockMesh and snappyHexMesh and checkMesh with all checks points just 1 failed check that is "concaveCells". Nonorthogonality is max 61, av 9. I'm using simpleFoam with kOmega SST model and 2 nonorthogonal correctors. I think it is a problem related with yPlus because I have been refining carefully the surface zones and this has allowed me to decrease the viscosity but now I have a max yPlus of 2,6 with wallFunctions and I can't improve the results for the point above said. Of course I can send all sim files anyone need. Thanks in advance. |
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simplefoam, turbulence, yplus |
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