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Help with Boundary conditions for a two phase simulation.

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Old   May 10, 2019, 07:31
Default Help with Boundary conditions for a two phase simulation.
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Florian
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Hello there,



i'm running a 2phase simulation (Water and Air) on a Hydrofoil wing. It took me a while but i finally managed to get it to converge on a value that makes sense and is pretty close to reality.



Now i wanna check how the wing performs when angled 1 up and down. All i changed was the arrangement of parts in the mesh. Mesh settings with influencebodies remain the same yet now the cases keep diverging again.



For the 0 simulation the fix seemed to be making the Boundaryconditions at the outlet more restrictive. I went from ZeroGradient for U, p_rgh and water to having u and water be fixedValues and p_rgh as fixedFluxPressure.


I kept those conditions the same for the -1 and +1 simulations yet they keep diverging. Does anyone have an idea what else i could try? CheckMesh only returns 3 high orthogonality faces out of 23million cells and says "Mesh OK" in general.



I'd be very grateful for some help.
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boundary conditions, convergence, divergence, ltsinterfoam

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