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interDyMFoam in foamExtend 3.2 layer removal flux correction |
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#1 |
Member
Michael Sukham
Join Date: Mar 2020
Location: India
Posts: 79
Rep Power: 6 ![]() |
The geometry is of a cylinder with an outlet where the piston wall moves according to a given acceleration. The simulation doesnt crash. However the interface is smeared completely on the curved side when the time goes beyond 1.3s . Can numerics in the fvScheme and fvSolutions solve this? I tried first order accurate numerics but the problem persist. Hope someone could shed a light on the matter. The dynamic mesh strategy is layer addition/removal which is basically the same as linearValveLayersFvMesh but without the sliding and attach/dettach. I have a feeling it is the layer removal that is causing the issue here. I tried 2D simulations which worked fine with Co limited to 0.5.
Last edited by 2538sukham; June 16, 2022 at 04:47. Reason: Some vital info missing |
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#2 | |
Member
Michael Sukham
Join Date: Mar 2020
Location: India
Posts: 79
Rep Power: 6 ![]() |
I will see if slip boundary condition on the curved wall can solve the issue. I will update it once it is done. It is a laminar case and the mesh qualify is quite fine.
With regards Quote:
Last edited by 2538sukham; June 16, 2022 at 06:09. Reason: Mesh data is included |
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#3 |
Member
Michael Sukham
Join Date: Mar 2020
Location: India
Posts: 79
Rep Power: 6 ![]() |
Well slip BC doesnt have much differences. Checking with interface compression cAlpha 0 to see if the problem is in the compression. If this fails, I think I will be lost in words .
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#4 |
Member
Michael Sukham
Join Date: Mar 2020
Location: India
Posts: 79
Rep Power: 6 ![]() |
Well when cAlpha is 0 i.e. without interface compression the flow is fine but its too diffusive. The image is attached. For now, I am producing the result from paraFoam -nativeReader with contour of alpha1 0.5. It is comparable to Aboudi et.al 2011 for high pressure die casting. Interface compression with topologically removing cells results in wiggles at the interface. Without the interface compression it is too much smeared. I don't know if CLSVOF which couples level set with classical VoF will be helpful in getting sharp interface. Any one can shed some light on this matter.
![]() Last edited by 2538sukham; June 30, 2022 at 11:50. Reason: Image was not attached. |
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#5 |
Member
Michael Sukham
Join Date: Mar 2020
Location: India
Posts: 79
Rep Power: 6 ![]() |
I am still lost. The fluid interface is wiggling near the top end of the cylinder. smoothing the mesh might be the solution but it will be in the expense of the mesh being too fine. Geometrical reconstruction might be the solution but with topo change, it seems quite a challenging task.
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#6 |
Member
Michael Sukham
Join Date: Mar 2020
Location: India
Posts: 79
Rep Power: 6 ![]() |
Found that WRAFTS code and flow3D is mainly used for high pressure die casting and shot sleeve wave dynamics. Is this something which will be really difficult in OpenFOAM?? All suggestions are welcomed
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Tags |
interdymfoam, topology change |
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