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-   -   Generate allHex mesh element quality (http://www.cfd-online.com/Forums/openfoam-solving/60192-generate-allhex-mesh-element-quality.html)

hsieh May 31, 2006 10:02

Hi, If one generates all-Te
 
Hi,

If one generates all-Tet elements first, then, decoposes each Tet into 4 Hex (this should not be difficult to do within OpenFOAM, I assume). What do you think about the quality of the Hex elements? Assuming the initial Tet elements have great quality.

Has anyone done this?

Pei

mprinkey May 31, 2006 11:51

I haven't read the paper but i
 
I haven't read the paper but it seems this has been done before:

http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=APCPCS00071 2000001002210000001&idtype=cvips&gifs=yes

Here some results from anl:

http://www-unix.mcs.anl.gov/~csverma/tet2hex.html

hsieh May 31, 2006 13:09

Dear Michael: Thanks for th
 
Dear Michael:

Thanks for the reply. The website I found mentioned that "most finite element analysts, because of the poor element quality that will in general result, have rejected this solution." I am wondering whethere there is any improvement in this area recently.

Pei

Website: http://www.andrew.cmu.edu/user/sowen...y/hexsurv.html

mprinkey May 31, 2006 13:38

There are always smoothing alg
 
There are always smoothing algorithms that can be applied afterwards. I think that most tet generators have a smoothing pass following the base grid generation. I believe most are based on an elasticity analogy. I know Hrv mentioned doing something similar when doing mesh motion. That would likely improve mesh quality in most cases. The question is whether that would be in anyway superior to just using the polyhedral mesh extracted as the dual of the tet mesh. Unless you were using finite elements, I don't see why tet->hex would be a win over tet->poly.


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