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

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.

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.

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

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

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