[snappyHexMesh] Meshing a small gap between walls

staustrahltriebwerk · July 19, 2012, 08:55

Hi there.

I'm trying to mesh a small gap between two walls. To give you an idea about the order of magnitude: The walls are 1e-3 meters thick each. The gap between them is about 1e-5 meters.

What is the best strategy to mesh this gap?

I tried to define a refinement Region around the gap and mesh it with a refinement Level of 8. But this doesnt worked. The mesh after snappyhexMesh looked as if there was no gap, so snappyHexMesh doesnt regonized the gap.
My next Idea would be to make the gap wider, but this isnt a good solution because my real geometry has this small gap.

Regards, Thomas

rcastilla · July 23, 2012, 12:46

Hi, Thomas,

a far as I konw, you have to define the refinement by surface, not bay region. If you have an STL defining your walls, you have to say SHM to refine around this surface:

refinementSurfaces
{
STLsurface
{
// Surface-wise min and max refinement level
level (5 5);
}
}

the first number in level is the refinement around a face. The second it in the interesection of two or more faces.

I hope it will help you. Regards

Robert

July 19, 2012, 08:55	Meshing a small gap between walls	#1
staustrahltriebwerk New Member Thomas Join Date: Jul 2012 Location: Darmstadt Posts: 7 Rep Power: 14	Hi there. I'm trying to mesh a small gap between two walls. To give you an idea about the order of magnitude: The walls are 1e-3 meters thick each. The gap between them is about 1e-5 meters. What is the best strategy to mesh this gap? I tried to define a refinement Region around the gap and mesh it with a refinement Level of 8. But this doesnt worked. The mesh after snappyhexMesh looked as if there was no gap, so snappyHexMesh doesnt regonized the gap. My next Idea would be to make the gap wider, but this isnt a good solution because my real geometry has this small gap. Regards, Thomas

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July 23, 2012, 12:46		#2
rcastilla Senior Member Robert Castilla Join Date: Apr 2009 Location: Spain Posts: 110 Rep Power: 17	Hi, Thomas, a far as I konw, you have to define the refinement by surface, not bay region. If you have an STL defining your walls, you have to say SHM to refine around this surface: refinementSurfaces { STLsurface { // Surface-wise min and max refinement level level (5 5); } } the first number in level is the refinement around a face. The second it in the interesection of two or more faces. I hope it will help you. Regards Robert