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-   -   Combination of Hex and Tet-Elements in GAMBIT (http://www.cfd-online.com/Forums/fluent/49618-combination-hex-tet-elements-gambit.html)

Sebastian Gatzka October 25, 2008 08:34

Combination of Hex and Tet-Elements in GAMBIT
 
Hello World.

I'm trying to mesh a volume. Unfortunately (or as a matter of fact) the computational domain contains a radius.

I still want to use hexahedron elements in the main part of the computational domain, so I decided to mesh the part near the radius with tetrahedron elements to deal with the radius.

Have a look at the picture, which will illustrate the problem: http://therealsega.th.funpic.de/open...tetra_area.jpg

The complete domain is still defined as one volume (and a volume group as well).

So, how is it possible to tell GAMBIT to mesh with tetrahedron elements in the designated area and to mesh with hexahedron element in the rest?

Maybe I have to split the domain, but I don't know how this can be achieved.

Thanks for your help. Sebastian

JB October 27, 2008 14:07

Re: Combination of Hex and Tet-Elements in GAMBIT
 
Hi,

Correct, you should split your domain in 3 volumes. I see from the picture that you already defined 2 faces. Just split your main volume with those faces ;)

geometry -> volume -> split volume -> split with: faces (real)

BTW: I'm afraid your mesh will have poor quality if you fill the in between volume with tet elements..

I hope this helps! /JB

Sebastian Gatzka October 27, 2008 15:59

Re: Combination of Hex and Tet-Elements in GAMBIT
 
Thank you JB.

I toyed around with GAMBIT and found a way to created the desired mesh.

http://therealsega.th.funpic.de/openfoam/finalmesh.jpg

I think in this combination the quality is not as bad as it would have been in the first approach ... Or do you think different?

mAx October 28, 2008 02:45

Re: Combination of Hex and Tet-Elements in GAMBIT
 
switch your tetra-volume into pave-volume, and you will have only hexa-

JB October 28, 2008 06:52

Re: Combination of Hex and Tet-Elements in GAMBIT
 
Yeah I think it was a good Idea to do what you did. You improved the mesh quality for sure.

Regarding element type, it really depends on what you're simulating.

Cheers /JB


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