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e.ahmadiyan April 15, 2013 03:56

Whate are cyclic BC restrictions
2 Attachment(s)
Hi every body
In fact I want to simulate a simple L shape channel with dsmcFoam as shows in the bellow shape:
Attachment 20764

boundary condition type in inlet and outlet boundaries are cyclic and in other boundaries are wall.the boundary file as below:

type empty;
nFaces 600;
startFace 8300;
type wall;
nFaces 600;
startFace 8900;
type cyclic;
nFaces 100;
startFace 9500;
matchTolerance 0.0001;
neighbourPatch outlet1;
type cyclic;
nFaces 100;
startFace 9600;
matchTolerance 0.0001;
neighbourPatch inlet1;

But when I run the case runs failed and give this errors:

--> FOAM Serious Error :
From function cyclicPolyPatch::order(const primitivePatch&, labelList&, labelList&) const
in file meshes/polyMesh/polyPatches/constraint/cyclic/cyclicPolyPatch.C at line 1385
Patch:outlet1 : Cannot match vectors to faces on both sides of patch
Perhaps your faces do not match? The obj files written contain the current match.

No base point for face 9691, 4(340 341 1502 1483), produces a decomposition that has a minimum volume greater than tolerance.

My test case is ...
Attachment 20765

Is this problem depend on cyclic restrictions that could not be able to match two faces that are not parallel ?
are there such restriction ?

Please help me to resolve this problem.


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