Hi
I was confronted with an errors in comsol:
1. inverted mesh element near coordinates
How do I fix this error? What changes do I apply?
2. In the mesh in comsol,how do I change Skewness criterion for unstructured meshes?
My study is time dependent and simulation is fsi
Best regards...
Dear Amirhosein Zakeri ,
This problems occur in the case of mesh hyper deformation. Consider the flowing steps, I think the tips can help you:
- Separate your geometry in different zone and use the finer meshes in the places with higher deformations.
- Omit the sharp geometries( for example sharp corners)
- use the Compressible fluid option. This case doesn't affect the results but improve the convergence.
- decrease time steps
- use" plot while solving" option, to see the time, which the solution diverge.
- Start with very low inlet velocities and be sure that the other parameters are not wrong.
- Go to moving mesh setting and change the distortion values.
You probably need to show some pics of the geometry near the inverted elements, if we are to help you. If it is just a warning, you can probably proceed anyway. COMSOL MP has several options when it comes to meshing, but if you are not happy with it, you might need a separat software package for meshing.
hi amirhossein
when you have deformation in your simulation, the mesh element in some areas stretches such that it is going to be teared. sometimes the problem is solved using finer mesh. also using automatic remeshing feature of COMSOL is another solution to your problem.
regards
hamid
Dear Amirhosein Zakeri ,
This problems occur in the case of mesh hyper deformation. Consider the flowing steps, I think the tips can help you:
- Separate your geometry in different zone and use the finer meshes in the places with higher deformations.
- Omit the sharp geometries( for example sharp corners)
- use the Compressible fluid option. This case doesn't affect the results but improve the convergence.
- decrease time steps
- use" plot while solving" option, to see the time, which the solution diverge.
- Start with very low inlet velocities and be sure that the other parameters are not wrong.
- Go to moving mesh setting and change the distortion values.
Dear Amirhosein Zakeri
I recommend you to use Element Quality Optimization in COMSOL Mesh module .
you can find instruction on the attached file.
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