CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > OpenFOAM > OpenFOAM Running, Solving & CFD

PisoFoam and Gravitation

Register Blogs Members List Search Today's Posts Mark Forums Read

LinkBack Thread Tools Search this Thread Display Modes
Old   October 23, 2011, 09:59
Default PisoFoam and Gravitation
New Member
Join Date: Oct 2011
Posts: 7
Rep Power: 14
krene is on a distinguished road

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:

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


    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:

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

The problem is running on OpenFOAM 2.0.1
krene is offline   Reply With Quote

Old   October 24, 2011, 02:28
Senior Member
Alberto Passalacqua
Join Date: Mar 2009
Location: Ames, Iowa, United States
Posts: 1,912
Rep Power: 36
alberto will become famous soon enoughalberto will become famous soon enough

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).

Alberto Passalacqua

GeekoCFD - A free distribution based on openSUSE 64 bit with CFD tools, including OpenFOAM. Available as in both physical and virtual formats (current status:
OpenQBMM - An open-source implementation of quadrature-based moment methods.

To obtain more accurate answers, please specify the version of OpenFOAM you are using.
alberto is offline   Reply With Quote

Old   October 25, 2011, 02:00
New Member
Join Date: Oct 2011
Posts: 7
Rep Power: 14
krene is on a distinguished road
Hi Alberto,

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

krene is offline   Reply With Quote


gravitation, openfoam 2.0.x, pisofoam

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

All times are GMT -4. The time now is 15:04.