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#include "udf.h"
DEFINE_CG_MOTION(movewall, dt, vel, omega, time, dtime)
{
        real a, f, pi, w;
        pi = 3.141592653;
        a = 0.00001;
        f = 20000;
        w = 2 * pi*f;
        vel[1] = a*w*cos(w*time);
}
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