How to generate this mesh?

lakeat · January 10, 2012, 11:49

I saw a multiblock mesh which can save the total grid number a lot as seen in the attached picture, does anyone know how to generate these kind of mesh?

I know blockMesh can merge patches, but I think it is too complicated to handle this.

Any help would be highly appreciated!

multiBlocks.png

JBeilke · January 10, 2012, 15:10

www.gridpro.com/support/355

lakeat · January 10, 2012, 15:12

Quote:

Originally Posted by JBeilke

www.gridpro.com/support/355

Thanks, But I mean the mesh would be discontinuous between adjacent blocks. I dont think gridPro can do than.

JBeilke · January 10, 2012, 15:24

Why do you want hanging nodes when you can get a better mesh without it? The trick is to use a smart topology like a compact enrichment.

The local refinement can be done later with ProStar or one of the OpenFoam meshing tools, but it is not a sign of good meshing to do it this way.

lakeat · January 10, 2012, 15:34

Hmm, so I guess you know how to convert the mesh with internal faces to OF format? Can you share with me the converter? I'd really appreciate it.

JBeilke · January 10, 2012, 15:47

I would do the refinement in Prostar and export the mesh to OF either in star4 or ccm format. There are converters for both formats in OF.

But as I wrote before I would not use a local refinement for this geometry.

lakeat · January 10, 2012, 15:49

Sorry, my bad, I mean gridPro. You have the converter?

PS1: I thought the term "internal surface" is the invention of GridPro. I didn't notice that Star ccm uses it too.

PS2: prostar us not free....

JBeilke · January 10, 2012, 17:50

Quote:

Originally Posted by lakeat

PS1: I thought the term "internal surface" is the invention of GridPro. I didn't notice that Star ccm uses it too.

The internal surface mentioned in the tutorial is just there to guide the elliptic smoother in gridpro. The resulting mesh is a pure hex mesh with 1 by 1 connectivity. There are also converers for GridPro to OF.

Quote:

Originally Posted by lakeat

PS2: prostar is not free....

Nothing is for free. Not even the death, because it costs your life ;-)

lakeat · January 11, 2012, 10:38

And do you have a solution to my another post.
http://www.cfd-online.com/Forums/ope...ity-field.html

Thank you very much.

JBeilke · January 11, 2012, 13:15

It's there.

January 10, 2012, 11:49	How to generate this mesh?	#1
lakeat Senior Member Daniel WEI (老魏) Join Date: Mar 2009 Location: Beijing, China Posts: 689 Blog Entries: 9 Rep Power: 21	I saw a multiblock mesh which can save the total grid number a lot as seen in the attached picture, does anyone know how to generate these kind of mesh? I know blockMesh can merge patches, but I think it is too complicated to handle this. Any help would be highly appreciated! multiBlocks.png __________________ ~ Daniel WEI ------------- Boeing Research & Technology - China Beijing, China Email

January 10, 2012, 15:34		#5
lakeat Senior Member Daniel WEI (老魏) Join Date: Mar 2009 Location: Beijing, China Posts: 689 Blog Entries: 9 Rep Power: 21	Hmm, so I guess you know how to convert the mesh with internal faces to OF format? Can you share with me the converter? I'd really appreciate it. __________________ ~ Daniel WEI ------------- Boeing Research & Technology - China Beijing, China Email

January 10, 2012, 15:49		#7
lakeat Senior Member Daniel WEI (老魏) Join Date: Mar 2009 Location: Beijing, China Posts: 689 Blog Entries: 9 Rep Power: 21	Sorry, my bad, I mean gridPro. You have the converter? PS1: I thought the term "internal surface" is the invention of GridPro. I didn't notice that Star ccm uses it too. PS2: prostar us not free.... __________________ ~ Daniel WEI ------------- Boeing Research & Technology - China Beijing, China Email

January 11, 2012, 10:38		#9
lakeat Senior Member Daniel WEI (老魏) Join Date: Mar 2009 Location: Beijing, China Posts: 689 Blog Entries: 9 Rep Power: 21	And do you have a solution to my another post. http://www.cfd-online.com/Forums/ope...ity-field.html Thank you very much. __________________ ~ Daniel WEI ------------- Boeing Research & Technology - China Beijing, China Email

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January 10, 2012, 15:10		#2
JBeilke Senior Member Joern Beilke Join Date: Mar 2009 Location: Dresden Posts: 498 Rep Power: 20	www.gridpro.com/support/355

January 10, 2012, 15:24		#4
JBeilke Senior Member Joern Beilke Join Date: Mar 2009 Location: Dresden Posts: 498 Rep Power: 20	Why do you want hanging nodes when you can get a better mesh without it? The trick is to use a smart topology like a compact enrichment. The local refinement can be done later with ProStar or one of the OpenFoam meshing tools, but it is not a sign of good meshing to do it this way.

January 10, 2012, 15:47		#6
JBeilke Senior Member Joern Beilke Join Date: Mar 2009 Location: Dresden Posts: 498 Rep Power: 20	I would do the refinement in Prostar and export the mesh to OF either in star4 or ccm format. There are converters for both formats in OF. But as I wrote before I would not use a local refinement for this geometry.

January 11, 2012, 13:15		#10
JBeilke Senior Member Joern Beilke Join Date: Mar 2009 Location: Dresden Posts: 498 Rep Power: 20	It's there.