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outflow bc-unrealistic pressure field (no backflow occours, incompressible fluid)

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Old   March 18, 2016, 20:40
Default outflow bc-unrealistic pressure field (no backflow occours, incompressible fluid)
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Hi fluent users,

i want to simulate the pressure loss of a structured channel. For this case i would consider some kind of Neumann-boundary condition at the outlet.

So i choosed in fluent following set-up:

velocity-inlet (pressure 400 000Pa, v=..., T=..., turbulence parameters...)
outflow-bc (flow rate weighting=1)

besides:
Incompressible fluid
No backflow at outlet-region


The pressure field in the domain is quite unreasonable, the static pressure on the outlet is about -124Pa, the total pressure about -55Pa!

(There are large vortices in the domain, but at the outlet the flow is fully developed.)

Whats wrong? i really would appreciate your suggestions!
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neumann, outflow, outflow bc, pressure field, pressure loss

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