help with meshing please

libya81 · March 11, 2017, 19:34

I have this system (see the pic)

Its a 4 parts system I will name them from inside to out side:

1-water domain through the pipe
2- pipe
3 fin
4 pcm (square)

its a heat transfer problem. the heat move from the water to the PCM through the pipe and the fin or vise versa

The question is. How to mesh the system with a good meshing method.

Every time I receive an error in fluent

your help is appreciated in advance

Thanks

piu58 · March 12, 2017, 01:45

There are places at the inner wall of the pipe where you have "free" noded (not connected to pipe cells) or at least rectangular elements in the pipe wall with 3 nodes in a line. I don't see which is the case from your image. The first case leads to a incorrect mesh and the second one gives numerical instability.

Sent from my HTC One SV using CFD Online Forum mobile app

libya81 · March 12, 2017, 08:53

THanks piu58 for your reply.

the two pics have been taken for the same case but from different view.

The first and last parts have been mished with Quad and the two in the middle with Tetra.

Do mot ask me why, I am just guessing.

Thanks

March 12, 2017, 01:45		#2
piu58 Senior Member Uwe Pilz Join Date: Feb 2017 Location: Leipzig, Germany Posts: 744 Rep Power: 15	There are places at the inner wall of the pipe where you have "free" noded (not connected to pipe cells) or at least rectangular elements in the pipe wall with 3 nodes in a line. I don't see which is the case from your image. The first case leads to a incorrect mesh and the second one gives numerical instability. Sent from my HTC One SV using CFD Online Forum mobile app __________________ Uwe Pilz -- Die der Hauptbewegung überlagerte Schwankungsbewegung ist in ihren Einzelheiten so hoffnungslos kompliziert, daß ihre theoretische Berechnung aussichtslos erscheint. (Hermann Schlichting, 1950)

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March 12, 2017, 08:53		#3
libya81 New Member Join Date: Apr 2012 Posts: 24 Rep Power: 14	THanks piu58 for your reply. the two pics have been taken for the same case but from different view. The first and last parts have been mished with Quad and the two in the middle with Tetra. Do mot ask me why, I am just guessing. Thanks