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Old   May 6, 2008, 12:19
Default I have created a simple microc
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Scott Ripplinger
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I have created a simple microchannel geometry using gmsh. I have the top and bottom boundaries set as walls and the inlet as a velocity inlet and outlet as a pressure outlet. I have been trying to set the left and right boundaries as cyclics, but am having no success. I set the types for those boundaries to 'cyclic' in the boundary, p, and U files. I am just trying to run icoFoam at the moment. When I run I get the following error after trying to read the p file:

--> FOAM FATAL ERROR : Attempt to cast type patch to type lduInterface#0 Foam::error::printStack(Foam:stream&) in "/home/Scott/OpenFOAM/OpenFOAM-1.4.1/lib/linux64GccDPOpt/libOpenFOAM.so"
#1 Foam::error::abort() in "/home/Scott/OpenFOAM/OpenFOAM-1.4.1/lib/linux64GccDPOpt/libOpenFOAM.so"
#2 Foam::lduInterface const& Foam::refCast<foam::lduinterface>(Foam::fvPatch const&) in "/home/Scott/OpenFOAM/OpenFOAM-1.4.1/lib/linux64GccDPOpt/libfiniteVolume.so"
#3 Foam::cyclicFvPatchField<double>::cyclicFvPatchFie ld(Foam::fvPatch const&, Foam::DimensionedField<double,> const&, Foam::dictionary const&) in "/home/Scott/OpenFOAM/OpenFOAM-1.4.1/lib/linux64GccDPOpt/libfiniteVolume.so"
#4 Foam::fvPatchField<double>::adddictionaryConstruct orToTable<foam::cyclicfvpatchf ield<double> >::New(Foam::fvPatch const&, Foam::DimensionedField<double,> const&, Foam::dictionary const&) in "/home/Scott/OpenFOAM/OpenFOAM-1.4.1/lib/linux64GccDPOpt/libfiniteVolume.so"
#5 Foam::fvPatchField<double>::New(Foam::fvPatch const&, Foam::DimensionedField<double,> const&, Foam::dictionary const&) in "/home/Scott/OpenFOAM/OpenFOAM-1.4.1/applications/bin/linux64GccDPOpt/icoFoam"
#6 Foam::GeometricField<double,>::GeometricBoundaryFi eld::GeometricBoundaryField(Fo am::fvBoundaryMesh const&, Foam::DimensionedField<double,> const&, Foam::dictionary const&) in "/home/Scott/OpenFOAM/OpenFOAM-1.4.1/applications/bin/linux64GccDPOpt/icoFoam"
#7 Foam::GeometricField<double,>::readField(Foam::Ist ream&) in "/home/Scott/OpenFOAM/OpenFOAM-1.4.1/applications/bin/linux64GccDPOpt/icoFoam"
#8 Foam::GeometricField<double,>::GeometricField(Foam ::IOobject const&, Foam::fvMesh const&) in "/home/Scott/OpenFOAM/OpenFOAM-1.4.1/applications/bin/linux64GccDPOpt/icoFoam"
#9 main in "/home/Scott/OpenFOAM/OpenFOAM-1.4.1/applications/bin/linux64GccDPOpt/icoFoam"
#10 __libc_start_main in "/lib64/libc.so.6"
#11 Foam::regIOobject::readIfModified() in "/home/Scott/OpenFOAM/OpenFOAM-1.4.1/applications/bin/linux64GccDPOpt/icoFoam"


From function refCast<to>(From&)
in file /home/Scott/OpenFOAM/OpenFOAM-1.4.1/src/OpenFOAM/lnInclude/typeInfo.H at line 103.

FOAM aborting


I have also tried using couplePatches and createPatch, but with no success. The OpenFOAM documentation is unclear to me on how to use cyclic bc's. Is this a problem with my setup, or could it somehow be an issue with gmsh (I have used both gmshToFoam and gmsh2ToFoam).
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Old   May 6, 2008, 14:52
Default Both inlet and outlet patches
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Jose Luis Santos
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Both inlet and outlet patches should be combined in a single patch, only then you can assign cyclic bc to it.

Check this thread, it may help you:
http://www.cfd-online.com/OpenFOAM_D...tml?1202795420
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Old   May 6, 2008, 15:11
Default I had actually just figured th
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I had actually just figured the single patch issue out. Apparently that was one of two issues. So I went back to gmsh, combined the Right and Left patches into one, then set that single patch as cyclic. After doing this I was still getting some problems, so I ran couplePatches which fixed the face ordering issue. The case is now running on icoFoam, and things seem just fine, pending my results.
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Old   May 7, 2008, 16:13
Default Can you post your mesh here?
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Matvej Kraposhin
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Can you post your mesh here? I mean, who is inlet, who is outlet.
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Old   May 27, 2008, 05:13
Default Hi Scott, could you please le
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Hi Scott,
could you please let us know how your results looked like?i am having a similar problem(kind of)and just wanted some clarification.does the cyclic boundary condition take into account the various boundary conditions in the geometry it is repeating?
anyone with answers?

cheers
davey
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Old   June 2, 2008, 04:25
Default hi all, i am having difficult
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hi all,
i am having difficulties with the cyclic patch and boundary condition.when i combine both patches(inlet and outlet)in my case and assign them as cyclic,and then try to run blockmesh, it gives me an error message:
--> FOAM FATAL ERROR : face 0 in patch 0 does not have neighbour cell face: 8(0 6 18 12 5 17 23 11)#0 Foam::error::printStack(Foam:stream&) in "/home/cfd/OpenFOAM/OpenFOAM-1.4.1/lib/linuxGccDPOpt/libOpenFOAM.so"
#1 Foam::error::abort() in "/home/cfd/OpenFOAM/OpenFOAM-1.4.1/lib/linuxGccDPOpt/libOpenFOAM.so"
#2 Foam::polyMesh::facePatchFaceCells(Foam::List<foam ::face> const&, Foam::List<foam::list<int> > const&, Foam::List<foam::list<foam::face> > const&, int) const in "/home/cfd/OpenFOAM/OpenFOAM-1.4.1/lib/linuxGccDPOpt/libOpenFOAM.so"
#3 Foam::polyMesh::polyMesh(Foam::IOobject const&, Foam::Field<foam::vector<double> > const&, Foam::List<foam::cellshape> const&, Foam::List<foam::list<foam::face> > const&, Foam::List<foam::word> const&, Foam::List<foam::word> const&, Foam::word const&, Foam::List<foam::word> const&, bool) in "/home/cfd/OpenFOAM/OpenFOAM-1.4.1/lib/linuxGccDPOpt/libOpenFOAM.so"
#4 Foam::blockMesh::createTopology(Foam::IOdictionary &) in "/home/cfd/OpenFOAM/OpenFOAM-1.4.1/applications/bin/linuxGccDPOpt/blockMesh"
#5 Foam::blockMesh::blockMesh(Foam::IOdictionary&) in "/home/cfd/OpenFOAM/OpenFOAM-1.4.1/applications/bin/linuxGccDPOpt/blockMesh"
#6 main in "/home/cfd/OpenFOAM/OpenFOAM-1.4.1/applications/bin/linuxGccDPOpt/blockMesh"
#7 __libc_start_main in "/lib/libc.so.6"
#8 Foam::regIOobject::readIfModified() in "/home/cfd/OpenFOAM/OpenFOAM-1.4.1/applications/bin/linuxGccDPOpt/blockMesh"


From function polyMesh::facePatchFaceCells(const faceList& patchFaces,const labelListList& pointCells,const faceListList& cellsFaceShapes,const label patchID)
in file meshes/polyMesh/polyMeshFromShapeMesh.C at line 127.

FOAM aborting

when i try to define the cyclic condition on one patch(say inlet),the results i get are highly distorted.i am at a loss here as i believe the first approach is the right one but in my case its not working.anybody who can help,please??

cheers,
davey
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