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-   -   Gambit mesh of tangential tube/tube (http://www.cfd-online.com/Forums/fluent/31131-gambit-mesh-tangential-tube-tube.html)

 Christian March 22, 2003 06:59

Gambit mesh of tangential tube/tube

I have a big tube and a little tube. The little tube is a tangent on the big tube. When I mesh the tangential part, Gambit tells me that the operation has failed.

It properly has something to do with the cells in the tangent point. I think they get too small and too skew (Gambit suggests this).

Do you agree? Do you have any suggestions how to mesh a tangential like that?

Cheers

 vyrro March 22, 2003 12:56

Re: Gambit mesh of tangential tube/tube

Christian,

I had the same problem. I was trying to mesh 2 tubes and I split the at the intersection. When I tried to mesh gambit didn't let me because of the highly skewed elements.

What I did was to unite the volumes and then split them along the longitudinal axes of the tubes. With these gambit didn't have to make elements bounded by 2 colliding surfaces because thre was no surface at the intersection (just empty space). Then I meshed the volume wit tet elements.

I hope I made myself clear.

 Christian March 25, 2003 07:06

Re: Gambit mesh of tangential tube/tube

Hi vyrro

I am not quite clear on your split along the longitudinal axis of the tubes. Does it mean that you cut the tube in half making 2 half-circular volumes pr. tube? (was that clear :)

If I unite the 2 tubes, I can mesh the volumen. But I cannot mesh it with hex as I would like to (I find that hex are more stable numerically and requires less cells).

Maybe the only way to make hex cells are to make an non-conform mesh intersection?

Cheers.

 Alamgir March 26, 2003 01:04

Re: Gambit mesh of tangential tube/tube

hi,

U cann't mesh this type of geometry with hex So u have think about the alternatives as the surfaces r not co-linear. Thanks/Alamgir

 Alex Munoz March 26, 2003 15:59

Re: Gambit mesh of tangential tube/tube

Hi

you can made a hybrid mesh the main pipe hexahedral the colateral one tetrahedral. In that way you eliminate your problem and oaso the split suguestion that personally I don't like.

Regards

Alex Munoz

 Christian March 27, 2003 04:34

Re: Gambit mesh of tangential tube/tube

Hi Alex.

I am not sure I know what you mean. Do you mean that I should mesh the main pipe with hex and the side pipe with tets, and connect the non-conformal meshes in Fluent ?

Cheers

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