Joints of a geometry not snapped well (SnappyHexMesh)

malini1408 · April 10, 2019, 04:35

Hello everyone,

I am relatively new to openFoam and I am trying to mesh a wedge-shaped geometry with a bore at the center to examine jet mixing. For simplicity I have divided the geometry into 3 parts- the middle part has a higher refinement than the top and bottom parts.

However the problem I encounter is that the joints between the 3 part geometry doesn't snap very well using SHM. Can anyone please tell me what I could do here? Will a refinement box do in those regions?

Also checkMesh says the Mesh is ok, but I am a little apprehensive about setting up the case with this mesh.

Any help will be really appreciated.

I am attaching a link to folder with relevant screenshots

https://drive.google.com/open?id=1UM...9aGHHsc4MXILbG

fresty · April 15, 2019, 13:09

Hi. How good or bad are the results if you snap onto single/ entire geometry? Unlike the screenshots, the snappyHexMeshDict is for a single/ undivided geometry isn't it?
Have you tried tinkering with 'resolveFeatureAngle'? That usually does yield better 'corner' fitting, although broadly speaking SHM has its issues with sharp edges.

April 10, 2019, 04:35	Joints of a geometry not snapped well (SnappyHexMesh)	#1
malini1408 New Member Malini Dasgupta Join Date: Mar 2019 Location: Germany Posts: 6 Rep Power: 7	Hello everyone, I am relatively new to openFoam and I am trying to mesh a wedge-shaped geometry with a bore at the center to examine jet mixing. For simplicity I have divided the geometry into 3 parts- the middle part has a higher refinement than the top and bottom parts. However the problem I encounter is that the joints between the 3 part geometry doesn't snap very well using SHM. Can anyone please tell me what I could do here? Will a refinement box do in those regions? Also checkMesh says the Mesh is ok, but I am a little apprehensive about setting up the case with this mesh. Any help will be really appreciated. I am attaching a link to folder with relevant screenshots https://drive.google.com/open?id=1UM...9aGHHsc4MXILbG

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April 15, 2019, 13:09		#2
fresty Senior Member Join Date: Aug 2014 Location: UK Posts: 213 Rep Power: 13	Hi. How good or bad are the results if you snap onto single/ entire geometry? Unlike the screenshots, the snappyHexMeshDict is for a single/ undivided geometry isn't it? Have you tried tinkering with 'resolveFeatureAngle'? That usually does yield better 'corner' fitting, although broadly speaking SHM has its issues with sharp edges.