[gea]

Hi:

I am working with OpenFoam 4 and I am using simpleFoam to simulate the flow in an open channel. I am using cyclic boundary conditions in the inlet and outlet patches.

I am trying to use flowRatePatch to calculate the discharge in the inlet or outlet patch, but I am getting this error:

surfaceRegion flowRatePatch: patch(outlet):
Region has no faces

I don't know if I am doing something wrong or it is because flowRatePatch don't work with cyclic patches.

Any help would be appreciated

[Mike_Pusti]

Hi guys!

Is there any solution for this error message "Region has no faces"? I've got the error when i used volFlowRateSurface. It worked on similar cases, but how ever in my last case the flow calculation broke, no idea why...

Mike

[Harrison Nobis]

I'm Having the same problem for a decomposed case when one processor doesn't contain the patch I'm trying to calculate flow rate from:
[0]
[0]
[0] --> FOAM FATAL ERROR:
[1]
[1]
[1] --> FOAM FATAL ERROR:
[1] [0] surfaceRegion flowRatePatch(name=left_BC): patch(left_BC):
Region has no faces
[0]
[0] From function void Foam::functionObjects::fieldValues::surfaceRegion: :initialise(const Foam::dictionary&)
[0] in file surfaceRegion flowRatePatch(name=left_BC): patch(left_BC):
Region has no faces
[1]
[1] From function void Foam::functionObjects::fieldValues::surfaceRegion: :initialise(const Foam::dictionary&)
[1] in file fieldValues/surfaceRegion/surfaceRegion.C at line 457.
[1]
FOAM parallel run exiting
[1]
fieldValues/surfaceRegion/surfaceRegion.C at line 457.
[0]
FOAM parallel run exiting
[0]


Has anyone solved this problem?

[Harrison Nobis]

Hey just fixed my problem so I figured I would post my solution:
My issue was I had decomposed my mesh in such a way that the faces I was trying to measure the flow rate across where also the boundaries between processors.

My fix was to include: preservePatches (left_BC front) in my decomposeParDict

hope this helps someone with a similar problem.

[AGhi]

Yes, it was. The right input at the right moment!