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difference between inlet and outlet flow rate ??

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Old   November 22, 2014, 20:49
Default difference between inlet and outlet flow rate ??
vitor spadeto
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I am simulating a flow in a pipe with pimpleFoam solver (imcompressible, newtonian and assuming laminar). Flow rate (m/s) gives the following error:

(outlet flow rate- inlet flow rate ) / inlet flow rate = 0.07 >>> 7% > difference of 7%

(I'm using adjustable time step and checkMesh returns "Mesh OK")

nu [ 0 2 -1 0 0 0 0 ] 6.85714e-06
diameter = 6mm of pipe
max speed = 0.6 m/s

Why?? Is this normal?

Best Regards,
Vitor Spadeto
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