[Gmsh] Converting 3d mesh to 2d mesh

krzychu111 · November 30, 2018, 09:08

Hi,

I want to create axisymmetric mesh using snappyhexmesh. Unfortunately snappyhexmesh do not support axisymmetric cases. So I created "cubic" geometry and used snapphexmesh. Now I need to make from 3d mesh 2d mesh and then revolve 2d mesh by axis to create axisimmetric mesh.

But the problem is that I don't know how to convert 3d mesh to 2d mesh. Is there any command to create new file from surface in gmsh? Or to delete all nodes and elements not on z plane? Maybe there is other tool which would be more handy in this scenario?

Thanks

simrego · November 30, 2018, 09:35

Hi!

You can use the extrudeMesh utility. Just extrude the patch with one cell.

krzychu111 · December 1, 2018, 15:07

@simrego Thanks for your reply!

I will give it a try.

simrego · December 1, 2018, 15:18

If you have questions feel free to ask!

I forgot to include an example dict, so here you go:
https://github.com/OpenFOAM/OpenFOAM...xtrudeMeshDict
You can extrude, revolve, etc. The file contains some explanation how to set up the dictionary.

November 30, 2018, 09:08	Converting 3d mesh to 2d mesh	#1
krzychu111 New Member Join Date: Oct 2018 Posts: 19 Rep Power: 7	Hi, I want to create axisymmetric mesh using snappyhexmesh. Unfortunately snappyhexmesh do not support axisymmetric cases. So I created "cubic" geometry and used snapphexmesh. Now I need to make from 3d mesh 2d mesh and then revolve 2d mesh by axis to create axisimmetric mesh. But the problem is that I don't know how to convert 3d mesh to 2d mesh. Is there any command to create new file from surface in gmsh? Or to delete all nodes and elements not on z plane? Maybe there is other tool which would be more handy in this scenario? Thanks

November 30, 2018, 09:35		#2
simrego Senior Member anonymous Join Date: Jan 2016 Posts: 416 Rep Power: 14	Hi! You can use the extrudeMesh utility. Just extrude the patch with one cell. krzychu111 likes this.

December 1, 2018, 15:18		#4
simrego Senior Member anonymous Join Date: Jan 2016 Posts: 416 Rep Power: 14	If you have questions feel free to ask! I forgot to include an example dict, so here you go: https://github.com/OpenFOAM/OpenFOAM...xtrudeMeshDict You can extrude, revolve, etc. The file contains some explanation how to set up the dictionary. krzychu111 likes this.

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December 1, 2018, 15:07		#3
krzychu111 New Member Join Date: Oct 2018 Posts: 19 Rep Power: 7	@simrego Thanks for your reply! I will give it a try.