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Old   July 21, 2009, 09:09
Default interFoam with irregular Mesh
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Luther Terblanche
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Hallo,

Is it possible to use interFoam with a tetrahedral mesh or is it only designed for hexahedral meshes.

I can get a simple case to run with tetra, but it crashes after a while. With the same geometry and input conditions, but with a hex mesh it works fine.

All the examples and other work I see of interFoam is with hex meshes.

If someone can please shed some light I would appreciate it.

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Luther
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Old   July 21, 2009, 09:56
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Niels Gjoel Jacobsen
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Hi Luther

From the point of view of OpenFOAM, I cannot see any limitations in interFoam, hence it must be a problem with your setup, which makes it unstable with tets.
If you could describe your problem in more details, e.g. with figures, I might be able to help.

Best regards,

Niels
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Old   July 21, 2009, 10:15
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Ulrich Heck
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Hi Luther,

also from my experience interFOAM works much better with hex-meshes than with tet-meshes. I think one reason is that the element growth rate in tet meshes can be rather high. So I made better experience with tet meshes providing a smoother transition (propagation rate). But this may result in rather large meshes...

Ulrich
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Old   July 21, 2009, 10:34
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Luther Terblanche
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Thank you Niels,

I will have a thorough look at my setup again and if the problem stil persists I will mail you the case and you can see if you find anything wrong.

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Luther
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Old   July 21, 2009, 22:54
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Jitao Liu
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Hi Luther,

I met the same problem when using the interFoam solver. The result was ok with hex-meshes. When I used tet-meshes for the same case, the courant number became bigger and bigger, then the calculation stopped.

Maybe, it is caused by the non-uniform tetrahedral mesh. I will pay more attention to it.

If there are any new developments, please let me know.

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Jitao
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Old   July 22, 2009, 02:53
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Julien Schaguene
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Hi Luther,

I use almost every time interFoam for my work. At first, I tried it only with hex mesh, and had no issue.
Then I tried the same cases with tet mesh. At first it crashed, but since I pay more attention in meshing, I do not face this kind of problems. So be carefull in meshing and there is no reason your simulation crashes because of mesh (I think...)

Regards

Julien
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Old   July 22, 2009, 04:23
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Sebastian Gatzka
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My experience with non-orthogonal grids is to make sure you use corrected schemes!

You can also try to increase the number of non orthogonal corrector loops (nOrthogonalCorrectors).
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Old   August 14, 2009, 01:20
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Cem Albukrek
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Don't waste time with tetrahedral grids for the interFoam class solvers by playing with correctors, schemes and etc. I wasted weeks trying to get things to work with tets and results were far from satisfactory = the effort is not worth it. Just go with hexes if you can.
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Old   August 14, 2009, 02:43
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Luther Terblanche
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Thank you. I have the same experience. Do you perhaps know about any literature where I can read up on the cause of this phenomenon?
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Old   August 14, 2009, 07:43
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Sebastian Gatzka
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Quote:
Originally Posted by luther View Post
Thank you. I have the same experience. Do you perhaps know about any literature where I can read up on the cause of this phenomenon?
I have posted some literature reference on this problem here:
http://www.cfd-online.com/Forums/ope...-than-tet.html
It's post #9 ...
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