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Old   June 28, 2011, 22:30
Default Pressure Boundary Condition
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Miguel Suarez
Join Date: Aug 2010
Location: El Paso Texas
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I am using Openfoam 1.7 chtMultiRegionSimpleFoam solver and I'm trying to get the same results as in Fluent. However, I'm getting different results (Pressure and Velocity).

My case is as follows:

Straight duct with a constant temperature bottom wall. the area of the inlet is 4x10-6 m^2. Reynolds no of 2000 (laminar flow). length of pipe is .25 m

The following are my boundary conditions

Quote:
0/u:
inlet
type flowRateInletVelocity
flowRate 7.28e-5
value uniform (0 0 0)

outlet
type outletInlet
outletValue uniform(0 0 0)
value uniform(0 0 0)
Quote:
0/prgh

inlet
type fixedValue
value $internalField

outlet
type outletInlet
value $internalField
outletValue $internalField
For my pressure boundary conditions I have tried several other ones such as :

fixedValue
zeroGradient
inletOutlet
etc

I have not tried freeStreamPressure because i Dont know if it applies in this case

Any help is greatly appreciated!!!! PLEASE HELP!!!!!!!!

The problem with my results is that my velocity decreases at the outlet. the initial velocity at the inlet is approx 10.4 m/s, at the outlet i'm getting velocities less than 3 m/s... which does not make sense

Miguel

Last edited by masuarez; June 28, 2011 at 22:37. Reason: missing information
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