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DynamicMesh - Move internal points

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Old   September 4, 2014, 15:29
Default DynamicMesh - Move internal points
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Hallo foamers,

actually I am programming an y+ adaption for OpenFoam. I need a tool, which manipulates the mesh by making the thickness of the first boundary layer smaller if there is detected y+>1.

I am able to detect that vertices with toposet:
  • select all faces with y+>1
  • select all cells with that selected faces
  • select points of the selected cells (first boundary layer)
  • deselect points of the boundary face
The result is a selection of points of the first boundary cells, but not points directly of the boundary (they have to stay fixed). Now I want to move them down and want to do it with dynamicMesh library.

Problem: I didn't find in the web a tutorial, how to move internal points (not boundary points) of the mesh. Do anybody knows how it works?

Thanks for help,
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Old   September 4, 2014, 18:35
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If you look at the layeredEngineMesh code, you can see there is code that moves certain mesh points to a new position based on the calculated crank angle. You will need to do something similar, although I don't quite know how you would determine the new position.

It would have to be some kind of function that finds distance to the nearest point on a boundary patch, then takes a fraction of the distance along the vector to the nearest point on the patch and moves the new point to that position (like half the distance?). Or just a set distance along that line. There are some built in functions like that in meshTools and other libraries. Its been a while since I've had to do anything with them.
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Old   September 6, 2014, 08:54
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thanks for reply. I think I will solve that problem by myself with toposet and python ))
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