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Create internal faces after createPatch

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Old   July 10, 2009, 05:36
Default Create internal faces after createPatch
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Niels Nielsen
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Hi

Im using the createPatch tool to create a cyclic boundary condition for the fan BC, when doing so it does not delete the two patches shown.

The problem only arises when the fan_in/fan_out patches doesn't cut through the whole domain.

I've attached 2 pictures of the problem.

I want to either delete the two patches or make them into an internal face.

I have tried using the splitMesh tool on the faceset from the patches but it just states that the face is not an internal face, hey I knew that , but thx for the info splitMesh.

I'm using Salome to create the Mesh and it cannot mesh if I only have an edge inside the domain. I think it is a netgen problem with regards to internal faces

Does anyone have a good ideas how to handle this kind of problem.



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Old   July 23, 2009, 19:40
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I'm in the same Boat. Similarly, I want to add a quick fan here and there on some electronic enclosures/radiator arrangements and such. From Salome I can't seem to mesh a 3d domain that contains an internal surface
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Old   July 23, 2009, 20:04
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Here are some pictures of what I want to do

http://www.flickr.com/photos/32908745@N04/3750924602/
http://www.flickr.com/photos/3290874...n/photostream/
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Old   July 24, 2009, 04:00
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I have actually found a workaround.

If you set the "matchTolerance" sufficiently low in the createPatchDict it wont merge the mesh but will retain the cut in the geometry and you can just set the outer walls to zerogradient and it wont affect the flow. It will still create the cyclic boundary condition and stuff just works :-). Just make a thin cut in your geometry from Salome and you will be flying.

My createPatchDict

class dictionary;
object createPatcheDict;
}

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

// Tolerance used in matching faces. Absolute tolerance is span of
// face times this factor.
matchTolerance 0.0015;

// Do a synchronisation of coupled points.
pointSync true;


// Patches to create.
// If no patches does a coupled point and face synchronisation anyway.
patches
(
{
// Name of new patch
name fan;

// Type of new patch
type cyclic;

// How to construct: either 'patches' or 'set'
constructFrom patches;

// If constructFrom = patches : names of patches
patches (fan_in fan_out);

}

);


Regards Linnemann
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