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Gambit mesh of tangential tube/tube

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Old   March 22, 2003, 06:59
Default Gambit mesh of tangential tube/tube
  #1
Christian
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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
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Old   March 22, 2003, 12:56
Default Re: Gambit mesh of tangential tube/tube
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vyrro
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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.
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Old   March 25, 2003, 07:06
Default Re: Gambit mesh of tangential tube/tube
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Christian
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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.
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Old   March 26, 2003, 01:04
Default Re: Gambit mesh of tangential tube/tube
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Alamgir
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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
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Old   March 26, 2003, 15:59
Default Re: Gambit mesh of tangential tube/tube
  #5
Alex Munoz
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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
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Old   March 27, 2003, 04:34
Default Re: Gambit mesh of tangential tube/tube
  #6
Christian
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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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