[BiomechanicsBath]

Hi there, you helpful lot
I am trying to solve a problem regarding my FSI case based on the BeamInCrossFlow. I am using foam-extend 3.2.
I have 2 meshes that I created via a third software. I made them into msh files and converted them for OpenFOAM. All looks fine in ParaView apart from the nodes of the two meshes not matching on the interface. However, I seem to have issues with GGI, or so says the log file of the fsi solver:

Starting time loop

Creating beamReport function object.
History point ID: 0
History point coordinates: (0 0 0)
Reference point coordinates: (0.45 0.15 -0.15)
Seting inlet velocity
Umax = 0.1
Time = 0.5

Create extended GGI zone-to-zone interpolator
Checking fluid-to-solid face interpolator
--> FOAM Warning :
From function Foam::SutherlandHodgman::lineSegmentIntersection()
in file algorithms/polygon/clipping/SutherlandHodgman.C at line 125
ub does not match with ua: delta: 2.05637e-15 : epsilon: 1e-15
--> FOAM Warning :
From function Foam::SutherlandHodgman::lineSegmentIntersection()
in file algorithms/polygon/clipping/SutherlandHodgman.C at line 125
ub does not match with ua: delta: 1.36985e-15 : epsilon: 1e-15
Fluid-to-solid face interpolation error: 95.3407
Checking solid-to-fluid point interpolator (GGI)
Extended GGI, master point distance, max: 1e+15, avg: 9.06867e+10, min: -3.21149
Extended GGI, master point orientation (<0), max: 0.999999, min: -1, nIncorrectPoints: 11008/452106


--> FOAM FATAL ERROR:
Master point addressing is not correct

From function ExtendedGGIInterpolation::masterToSlavePointInterp olate(const Field<Type> pf)
in file ./numerics/ggi/ExtendedGGIInterpolation/ExtendedGGIInterpolation.C at line 703.


I know this topic came up on another thread under HronTurekFsi3 foam-extend3.1, but it doesn't apply to me, as I have imported a mesh that hasn't been created using blockMesh.

Could anyone tell me how to identify the problem and how to solve it?
I am fairly new to OpenFOAM, so I am totally lost.

Any help would be much appreaciated.


Kind regards

[jwm349]

Did you ever resolve this issue? I'm facing the same problem.

[sangeet]

Hello,


I have the exact same problem, my fluid and solid meshes are from snappyHexMesh. Could you please tell me if you managed to resolve this issue?

[pjagdale1]

This problem occurs due to gap between fluid-solid interface. Open both Fluid and solid in Paraview by command
paraFoam -nativeReader

(in fluid folder)

ans see whether there is a gap between the fuid and solid surface.
If gap is found edit the geometry.

Thank you