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Dissimilar meshes with chtMultiRegionFoam

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Old   September 19, 2011, 21:51
Default Dissimilar meshes with chtMultiRegionFoam
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Charles McCreary
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I've been using chtMultiRegionFoam with good success for some time now. To date, all of the cases I've solved have been "consistent" meshes in that the solid/fluid interface patches share the same points. Is there a mechanism in OpenFOAM in which I can use completely different meshes for the solid and the fluid in which no points are shared?

My objective is to have a rather coarse mesh for the solid and a very fine mesh for the surrounding fluid.
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Old   September 21, 2011, 03:03
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Aram Amouzandeh
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thats a very good question I d be also interested in! what I m currently trying is to refine the base mesh where later on the individual regions should be placed in order to achieve different mesh sizes in the regions.

aram
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Old   September 21, 2011, 08:34
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Vesselin Krastev
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The chtMultiRegionFoam (and chtMultiRegionSimpleFoam as well) solver implemented in the OpenCFD OpenFOAM releases (at least till the 1.7.1 one) needs a consistent mesh at the separation surface between different regions. By the way, I saw recently a presentation from Prof. Jasak in which he explained quite clearly that the GGI (Generic Grid Interface) implemented in the -dev or -ext OpenFOAM releases is (in principle) capable of handling any type of flux exchange between two adiacent non-conformal interfaces: thus, if you are interested in this topic, I can advice you to deeply investigate the capabilities of the OpenFOAM-1.6-ext release (personally I havent't had sufficient time to do it in the last period, so I will not be able to give you any practical further support about this matter).

Regards

V.
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Old   September 21, 2011, 15:02
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MSR CHANDRA MURTHY
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It must be possible with ggi feature of 1.6-ext. The non-conformal fluid-solid coupled BC need to be conservative and at-least 2nd order accurate to get better results. I think it can work out, if you can write a new BC inheriting the classes of ggi and coupled bc of chtmultiregionfoam. It appears that the present implementation of ggi in 1.6-ext is conservative due to face-cutting method. I think it is possible to implement it.
I have done a similar type work, which takes the nearest 3 points and calculates new face field using inverse distance weight function method. hope this is useful
regards,
Chandra Murthy
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