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Triangular mesh - fully developed flow between parallel plate

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Old   November 25, 2010, 13:54
Default Triangular mesh - fully developed flow between parallel plate
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Amir
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Dear Friends,

I want to simulate a fully developed flow between infinite parallel plate (2-D), with prescribed pressure for inlet and outlet. When I use rectangular (structured) mesh, the results are consistent with analytical solution:

u = h ^ 2 (2 * mio) * ( Delta P / L) * ((y/h) ^ 2 - (y/a) )

but when I use 3-node triangular mesh (with any form I tested) the resulted velocity profile are not correct; lower velocity is obtained for a prescribed pressure gradient.

I tried finer triangular mesh, but no better results achieved.

I Use ADINA-8.5 Software which is finite element based.

Any suggestion and guidance is really appreciated.
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Old   November 25, 2010, 19:44
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Should (y/a) in your formula be (y/a)^2 ?
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Old   November 26, 2010, 13:18
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Thanks for your reply, it should be y/h, but this is not a mistake, there is a fundamental error in using triangular mesh, but I don't know what is that?
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Old   November 28, 2010, 05:52
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I changed the upwind type from Finite Element to Finite Volume in ADINA and know the results are correct.
It can be found here in ADINA:

Control -> Miscellaneous option -> Default upwinding type > Finite Element
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