WIND User's Guide - Keyword Reference, MOVING WALL

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MOVING WALL - Specify moving wall boundaries

MOVING [WALL] iblreg {[TRANSLATE {I | X} speed] | [SPIN X rps yc zc]}

This keyword allows no-slip walls to have a tangential velocity.

iblreg Moving walls are activated in regions specified as bleed in the .cgd file (set with GMAN). iblreg is the bleed region number.
TRANSLATE I Move wall in the i-direction at the velocity speed, in feet per second.
TRANSLATE X Move wall in the x-direction at the velocity speed, in feet per second.
SPIN X Move wall to model rotation about the x-axis (wall should be spinning and tangent to this motion).

rps Rotation speed in radians per second
yc,zc Coordinates of the center of rotation in the y-z plane