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pressure viscous drag on pipe

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Old   December 30, 2014, 14:50
Default pressure viscous drag on pipe
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Hossam Alaa
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Hello every body, I am new Fluent user and I have a question on pressure and viscous drag resulting from flow inside a pipe with fixed area which should be:
pressure drag=0 , viscous drag > 0 in case of viscous flow ....

when I used (hexahedron mesh) I found pressure drag =0, and viscous drag>0...
BUT
when I used (tetrahedron mesh) pressure drag was big value comparable to the viscous drag.

can any one explain why this occurs when using tetrahedron elements??

Last edited by Hossam Alaa; December 31, 2014 at 04:33.
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