# cyclic boundary condition

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 April 11, 2013, 07:36 cyclic boundary condition #1 New Member   Amit Jha Join Date: Apr 2013 Posts: 3 Rep Power: 4 can any one given some basic insite of cyclic boundary condition?

 April 18, 2013, 18:28 #2 New Member     Phillip Join Date: Mar 2012 Location: Germany Posts: 27 Rep Power: 5 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 cutting-out 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 JR22 and mohammad81 like this.

 July 4, 2013, 23:31 Cyclic BC for Cavity problem #3 New Member   Mohammad Join Date: Jul 2013 Posts: 10 Rep Power: 4 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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