Triangular mesh  fully developed flow between parallel plate
Dear Friends,
I want to simulate a fully developed flow between infinite parallel plate (2D), 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 3node 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 ADINA8.5 Software which is finite element based. Any suggestion and guidance is really appreciated.:) 
Should (y/a) in your formula be (y/a)^2 ?

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?

Solved
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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