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April 15, 2015, 04:53 |
what is the best strategy for dynamic mesh ?
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#1 |
New Member
logan
Join Date: Feb 2012
Posts: 10
Rep Power: 14 |
i have been trying to create a mesh for dynamic boundary . like an oscillating wall . i always encounter negative volume error .
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June 5, 2015, 07:30 |
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#2 |
New Member
Al_th
Join Date: Apr 2015
Posts: 19
Rep Power: 11 |
Hi wolverine,
I guess the final solution will be dependant of what are the tools that you use, but I have worked on a similar problem (Oscillating wall). I am using Salome to mesh my geometry I am using Openfoam to solve both mesh motion and flow equations Within Openfoam, I am using pimpleDyMFoam application with dynamicMotionSolverFVMesh The problem I encountered that when the motion of the wall was too big, some of the cells of the mesh collapsed. I found that there is some motion solver that are able to resolve topological changes (typically when a cell collapses, you have a change in the topology of your mesh), but in my case I had a lot of errors. The solution I have found is the following : - Define a python script to do the geometry and the meshing (Salome accepts python scripts) - Initialise position of the wall - Start the simulation until it crashes (the only reason my simulations crashes are because of cells that are either collapsing or extending too much). - Look at the last position of the wall - Remesh with the current wall position - Map the result of your previous mesh to your new mesh. - Restart simulation at the last timestep with the new mesh. Everything is scripted in bash, and this is a little bit tiresome, but it works quite well at the end, and it is doing what was expected ! |
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