difference between inlet and outlet flow rate ??
 

I am simulating a flow in a pipe with pimpleFoam solver (imcompressible, newtonian and assuming laminar). Flow rate (m³/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")

Values:
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