# Gambit mesh of tangential tube/tube

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 March 22, 2003, 06:59 Gambit mesh of tangential tube/tube #1 Christian Guest   Posts: n/a 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

 March 22, 2003, 12:56 Re: Gambit mesh of tangential tube/tube #2 vyrro Guest   Posts: n/a 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.

 March 25, 2003, 07:06 Re: Gambit mesh of tangential tube/tube #3 Christian Guest   Posts: n/a 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.

 March 26, 2003, 01:04 Re: Gambit mesh of tangential tube/tube #4 Alamgir Guest   Posts: n/a 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

 March 26, 2003, 15:59 Re: Gambit mesh of tangential tube/tube #5 Alex Munoz Guest   Posts: n/a 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

 March 27, 2003, 04:34 Re: Gambit mesh of tangential tube/tube #6 Christian Guest   Posts: n/a 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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