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[Salome] Problem with tetrahedral-mesh (salome) |
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March 13, 2012, 12:02 |
Problem with tetrahedral-mesh (salome)
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#1 |
New Member
Join Date: Mar 2012
Posts: 23
Rep Power: 14 |
Hello everybody,
I'm new to OpenFOAM and I want to use CAD-Data meshed with Salome in OpenFOAM. For learning how to use OpenFOAM with structural mechanics I used a simple model. It is a simple beam, which is fixed at the bottom and displaced (0.04m in y-direction) at the upper part. I tried the import (ideasUnvToFoam) of a hexahedral and a tetrahedral mesh with the complete same case. The hex-mesh worked fine and with the tet-mesh I get really strange results which I can't explain (see pics). checkMesh does not complain after the import of the tet-mesh. Unfortunaley the mesh-size is to big, so i could not upload it. I would be very thankful if someone could help me! Best regards Matthias |
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March 14, 2012, 05:38 |
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#2 |
New Member
Join Date: Mar 2012
Posts: 23
Rep Power: 14 |
Hello all,
is there anybody out there, who had a comparable problem or has anybody an idea where I can start searching. I already checked my mesh with checkMesh and the solver converged as well. Another question I have is: one of my boundary conditions is a displacement of 0.04m: oben { type fixedValue value uniform (0 0.04 0) } Now I want that the motion in x- and z-direction is not "0" but changes, so that the boundary "oben" isn't anymore parallel to its initial position. Is there an easy way to do this?. With best regards Matthias |
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March 15, 2012, 17:20 |
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#3 |
New Member
Lachlan Graham
Join Date: Dec 2009
Posts: 14
Rep Power: 16 |
Hi,
I've had a similar issue in fluid dynamics in laminar pipe flow of non-Newtonian fluids. With hex meshes developed using blockMesh I get converged solutions which agree very well for the pressure drop with the analytical values. With tet meshes with viscous layers developed in Salome, the pressure drop is about 5% too high even though the solutions are well converged. I'm working through some possible issues with mesh quality and choice of discretisation schemes etc. Perhaps these will help. I want to move to more complex gemetries so I need to validate the meshing. Not sure if I have helped, but perhaps there is an issue. Regards, Lachlan |
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March 19, 2012, 04:23 |
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#4 |
New Member
Join Date: Mar 2012
Posts: 23
Rep Power: 14 |
Hello Lachlan,
thank you for your reply! Until now I haven't found a solution for my problem. But I'm still working on it. As alternativity I'm testing snappyHexMesh, because I want to move to more complex geometries, too. Best regards Matthias |
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March 20, 2012, 09:59 |
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#5 |
Senior Member
Kyle Mooney
Join Date: Jul 2009
Location: San Francisco, CA USA
Posts: 323
Rep Power: 17 |
Eric Patterson gives some good recommendations for discretization choices for unstructured grids in this Thread (post #5).
http://www.cfd-online.com/Forums/ope...red-grids.html It might improve your solution. |
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March 20, 2012, 14:52 |
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#6 |
New Member
Join Date: Mar 2012
Posts: 23
Rep Power: 14 |
Hi kmooney,
thank you for the link. It sounds interesting and I will try it! Best regards Matthias |
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mesh salome cad opefoam |
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