WIND User's Guide - Keyword Reference, PERIODIC

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PERIODIC - Periodic boundaries

Periodic boundaries are treated as normal coupled boundaries in WIND, with the connection data stored in the grid (.cgd) file. No keyword is needed in the input data (.dat) file.

GMAN's CONNECT MODE option is used to specify how to move one boundary surface to overlay it on the corresponding periodic boundary surface. There are two connection modes - translation and rotation. For translation, the user defines the delta x, delta y, and delta z movement for the surface. For rotation the user sets the center of rotation and the angles. The periodic boundary surfaces do not have to be in the same zone, nor do they have to be point matched. They only have to line up physically once the movement has been performed.

See the Periodic Boundaries subsection for details about how to set a periodic boundary condition in GMAN.