Volume Meshing

Mrsimple · March 20, 2016, 11:54

Good day everybody I would like to seek help for volume meshing. The agenda is to allow flow into the empty space in a hollow pipe and run a natural convection heat transfer in sea bed and pressure drop along pipe with multiphase medium.

I had made a CAD drawing from the StarCCM+ CAD function. It is a simple case of extruding a solid pipe to obtain this figure

After which I needed to extract the internal volume by selecting the edges of the pipe on both ends

I was really happy to think that it would work out because the shape that I had meshed turned out to be like this, it does not look like any polyhederal type of mesh. I'm not sure if its a volume mesh. If i hide the pipe and show the internal volume extracted it looks like a solid pipe.

Nevertheless, I still did the meshing only to end up with the REGION SELF-INTERSECTING. I did ways to adjust the mesh sizing, creating interfaces at the region section but I could not solve this problem. It would be awesome to obtain results which are some what like this...............

Source: SEA Conference 2012 CD adapcco
Best Practices Volume Meshing: Kynan Maley

Of course the geometry I am doing would not be this complicated. I look forward to all types of suggestions and help!

fluid23 · March 22, 2016, 14:48

The third image you show is a surface mesh, not volume mesh. This will always be tet elements. Your polyhedral mesh is constructed from your tet surface mesh.

I suspect that you need to remesh the surface to get what you are after.

me3840 · March 25, 2016, 09:20

The third image is not a surface mesh, it's a tessellation of CAD geometry. (I guess it really is a surface mesh, but this mesh is for visualization and not useful for CFD)

The surface being self-intersecting means there's a problem between the connectivity of your two parts (or that the parts aren't closed, but they're so simple this is unlikely). Do your parts have contacts and the regions have an interface? If not, you may need to imprint these parts in 3D-CAD.

March 20, 2016, 11:54	Volume Meshing	#1
Mrsimple New Member Henry Join Date: Mar 2016 Posts: 9 Rep Power: 10	Good day everybody I would like to seek help for volume meshing. The agenda is to allow flow into the empty space in a hollow pipe and run a natural convection heat transfer in sea bed and pressure drop along pipe with multiphase medium. I had made a CAD drawing from the StarCCM+ CAD function. It is a simple case of extruding a solid pipe to obtain this figure After which I needed to extract the internal volume by selecting the edges of the pipe on both ends I was really happy to think that it would work out because the shape that I had meshed turned out to be like this, it does not look like any polyhederal type of mesh. I'm not sure if its a volume mesh. If i hide the pipe and show the internal volume extracted it looks like a solid pipe. Nevertheless, I still did the meshing only to end up with the REGION SELF-INTERSECTING. I did ways to adjust the mesh sizing, creating interfaces at the region section but I could not solve this problem. It would be awesome to obtain results which are some what like this............... Source: SEA Conference 2012 CD adapcco Best Practices Volume Meshing: Kynan Maley Of course the geometry I am doing would not be this complicated. I look forward to all types of suggestions and help!

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March 22, 2016, 14:48		#2
fluid23 Senior Member Matt Join Date: Aug 2014 Posts: 947 Rep Power: 17	The third image you show is a surface mesh, not volume mesh. This will always be tet elements. Your polyhedral mesh is constructed from your tet surface mesh. I suspect that you need to remesh the surface to get what you are after.

March 25, 2016, 09:20		#3
me3840 Senior Member Join Date: Nov 2010 Location: USA Posts: 1,232 Rep Power: 24	The third image is not a surface mesh, it's a tessellation of CAD geometry. (I guess it really is a surface mesh, but this mesh is for visualization and not useful for CFD) The surface being self-intersecting means there's a problem between the connectivity of your two parts (or that the parts aren't closed, but they're so simple this is unlikely). Do your parts have contacts and the regions have an interface? If not, you may need to imprint these parts in 3D-CAD.