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Old   October 23, 2011, 09:59
Default PisoFoam and Gravitation
  #1
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rene
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Hi

I'm new in OpenFOAM and so I do not have so much experience with changing code etc.

I do have a problem with PisoFoam. I'd like to use the buoyantPressure at the walls but I get the following error message:

Code:
request for uniformDimensionedVectorField g from objectRegistry region0 failed
    available objects of type uniformDimensionedVectorField are

0
(
)


    From function objectRegistry::lookupObject<Type>(const word&) const
    in file /home/opencfd/OpenFOAM/OpenFOAM-2.0.1/src/OpenFOAM/lnInclude/objectRegistryTemplates.C at line 131.

FOAM aborting
When I change the BC to zeroGradient, the code is running without any problems.
I think, there is a problem with the gravitation. I do have a file in constant/g which stands for the gravitation.

I saw the thread but I do not really know what to change: private boundary condition in controlDict strange behaviour

Thank you in advance for your help. Have a nice day.

The problem is running on OpenFOAM 2.0.1
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Old   October 24, 2011, 02:28
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Alberto Passalacqua
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Hi,

pisoFoam does not account for the gravity, so no gravitational vector is defined when you run it. The buoyantPressure condition is equivalent to zeroGradient, if g = 0.

You might want to take a look at solvers involving buoyancy (heatTransfer directory).

Best,
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Old   October 25, 2011, 02:00
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rene
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Hi Alberto,

thanks for this information. I'll try with another solver.

Regards
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gravitation, openfoam 2.0.x, pisofoam

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