patchMassFlow through boundary type cyclic
 

Is that possible?
My values are totally wrong.

At boundaries type patch, no problem.

You can use function objects to check continuity across your ggi interface.

Put the following code into system/controlDict:

Now, at every time step, for every pair of cyclic boundaries, you should get an output on the terminal such as

The first two numbers are mass flow through the interface on either side, the last two the error (abs and rel) between the two.

Is that possible that ggiCheck functionObject isn't integrated in Openfoam 1.7.1?
And it is also possible to do MassFlowAverage for the field ptot through a cyclic boundary?

--> FOAM FATAL ERROR:
Unknown function type ggiCheck
Valid functions are :
15
(
panicDump
patchAverage
patchFieldFlow
patchIntegrate
patchMassFlow
patchMassFlowAverage
probes
sets
surfaces
trackDictionary
volumeAverage
volumeIntegrate
volumeMinMax
writeAdditionalFields
writeFieldsOften
)

I might be wrong on that, but if I'm correctly informed, GGI is only available in the -dev branch of OF. Now that I read your 1st post more carefully I realized that you're probably using the boundary type "cyclic" and not "cyclicGgi" which are two different things. Unfortunately, I guess if you're using OF-1.7 and not the -dev branch, you're stuck with the "cyclic" bc. Sadly, I don't have any experience with this type of bc....
Anyway, the the workaround i showed you would only work for mass flux, not other custom quantites (although I think it could be easily done by adding some lines of code to ggiCheck)

I had the same problem than you Ralph

It indeed appears that patchMassFlow is not working with the cyclic BC.

I solved the issue by creating a faceSet from the cyclic BC using topoSet

Then I used swakExpression as mentioned in this document (page 41)

http://www.tfd.chalmers.se/~hani/pdf.../AISwithOF.pdf

Looks to be working. I have to check that though ;-)

best regards

Sylvain