[Other] How to mirror two boundaries for cyclic patches?

kornickel · November 20, 2013, 08:24

Hi everyone,

I am new in meshing with blockMesh/snappyHexMesh and I am having trouble with achieving a mesh with 100% matching surfaces on two cyclic boundaries. Can anyone tell me what's the best way to mirror two meshed surfaces using Open Source software (preferably blockMesh/snappyHexMesh)? The surface area of the boundaries is the same, the created cell number (and node positions) is just different. My domain exists as a STEP/STL/OBJ file.

Thank you and best regards,

Frank Ubber

mturcios777 · November 20, 2013, 14:49

What you are asking is a difficult proposition. Besides defining the cyclics as boundaries with more refinement and aligning your mesh symetrically, these isn't a whole lot you can do. You can always reduct the matching tolerance

kornickel · November 20, 2013, 18:00

So, how are meshes for use with cyclic patches usually made since you need a perfect patching partner face?

mturcios777 · November 20, 2013, 18:16

Well, it doesn't have to be 100% perfect, but it helps with the results. To do 100% matching you need to use a tool like blockMesh or similar that can create the faces explicitly based on your input. Also using binary format in your input files helps, since you can keep more precision.

November 20, 2013, 08:24	How to mirror two boundaries for cyclic patches?	#1
kornickel Member Frank Ubber Join Date: Aug 2013 Posts: 32 Rep Power: 13	Hi everyone, I am new in meshing with blockMesh/snappyHexMesh and I am having trouble with achieving a mesh with 100% matching surfaces on two cyclic boundaries. Can anyone tell me what's the best way to mirror two meshed surfaces using Open Source software (preferably blockMesh/snappyHexMesh)? The surface area of the boundaries is the same, the created cell number (and node positions) is just different. My domain exists as a STEP/STL/OBJ file. Thank you and best regards, Frank Ubber

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November 20, 2013, 14:49		#2
mturcios777 Senior Member Marco A. Turcios Join Date: Mar 2009 Location: Vancouver, BC, Canada Posts: 740 Rep Power: 28	What you are asking is a difficult proposition. Besides defining the cyclics as boundaries with more refinement and aligning your mesh symetrically, these isn't a whole lot you can do. You can always reduct the matching tolerance

November 20, 2013, 18:00		#3
kornickel Member Frank Ubber Join Date: Aug 2013 Posts: 32 Rep Power: 13	So, how are meshes for use with cyclic patches usually made since you need a perfect patching partner face?

November 20, 2013, 18:16		#4
mturcios777 Senior Member Marco A. Turcios Join Date: Mar 2009 Location: Vancouver, BC, Canada Posts: 740 Rep Power: 28	Well, it doesn't have to be 100% perfect, but it helps with the results. To do 100% matching you need to use a tool like blockMesh or similar that can create the faces explicitly based on your input. Also using binary format in your input files helps, since you can keep more precision.