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Boundary Conditions for SimplrFoam, Lamianr Flow, Incompressibel

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Old   March 27, 2020, 14:09
Default Boundary Conditions for SimplrFoam, Lamianr Flow, Incompressibel
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Gurpreet Singh
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Hi OpenFOAM Users,

I am working on a CFD problem using OpenFOAM for a axis symmetric , incompressible and steady state problem using simpeFoam solver. I made structured mesh using Pointwise and imported to OpnFOAM. I run it successfully in OpenFOAM.

I am bit confused in applying the boundary conditions as I only know the boundary condition at the inlet as ( Discharge = 1 m^3/min). I do not know any boundary conditions at the outlet.

I calculate the Velocity from given Discharge and use that value as BC for velocity at inlet and for pressure I used zero Gradient BC at the inlet.

As in my case, the outlet is attached to a pipe in a Oil field Well where I do not know the pressure and velocity at the outlet.

Can anyone suggest me what type of BC should I use at the outlet for Pressure and Velocity ?

I am attaching the screenshot of geometry for referencing. Picture1.jpg

Regards
Gurpreet
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Old   June 3, 2020, 07:14
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suggestions:
1. extend your outlet pipe to allow a fully developed flow
2. velocity BC at outlet: pressureInletOutletVelocity
3. pressure BC at outlet: fixedValue, value: try 100000. value doesn't really matter bc only the pressure gradient is important.
4. pressure BC at inlet: fixedFluxPressure
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