cyclic boundary condition
can any one given some basic insite of cyclic boundary condition? :confused:

Hey Amit,
the cyclic boundary condition is a periodic boundary condition. This is usually use to reduce the mesh size of a rotationally symmetrical domain by cuttingout a piece (e.g for a 360 degree tube, you can only cut a 10 degree piece and set at the cutting planes the cyclic boundary condition). This is for flows that are in a static sense constant in one direction, then you can set the periodic boundary conditions in these direction (p=zeroGradient @ cyclics, i think ?). One example is e.g. a axial compressor stage grid... or this http://www.adina.com/newsgH75.shtml 
Cyclic BC for Cavity problem
Hi everyone.
I want to use cyclic (periodic) BC for cavity problem. it sounds simple. I want to use cyclic BC for both P and U (for inlet and outlet). I want to know what I have done is correct or not. Thank you. This is blockMeshDict:  patches ( wall topWall ( (3 7 6 2) ) wall bottomWall ( (1 5 4 0) ) cyclic inout ( (0 4 7 3) (2 6 5 1) ) empty frontAndBack ( (0 3 2 1) (4 5 6 7) ) );  This is my Boundary file: 4 ( topWall { type wall; nFaces 40; startFace 1540; } bottomWall { type wall; nFaces 40; startFace 1580; } inout { type cyclic; nFaces 40; startFace 1620; featureCos 0.9; } frontAndBack { type empty; nFaces 1600; startFace 1660; } )  My 0/U is: inout { type cyclic; value uniform (0 0 0); }  Finally 0/P is: inout { type cyclic; value uniform 0; }  Is this correct? I got some result. I get the linear velocity and uniform pressure (Couette Flow). But I am not sure of it. Is this type of using cyclic correct? what is this "neigbourpathc", "fan" etc..? Thank you very much. 
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