[aginugroho]

Hello.
My name is Satrio from Indonesia, using ANSYS Fluent to simulate 2D rectangular tank with sinusoidal motion in z-axis direction (rolling).
I tried to simulate my model in Fluent but there's a problem with the motion, it doesn't rotate in 1 full period of wave, but only half rotate (half cycle) and then back to equilibrium condition and then rotating half cycle again. I want rotate (rolling) to the left and right direction. The condition now is rolling to the right direction and then back to equilibrium condition, then back roll to right direction.

this is my UDF

DEFINE_CG_MOTION(NonCoupled, dt, vel, omega, time, dtime)
{
real w1, pi, a1, a2;
pi = 3.141592654;

w1 = 0.67 ; /* Encounter frequency */
a1 = -0.017 ; /* Roll Amplitude */

NV_S (omega, =, 0.0);
omega[0] = 0;
omega[1] = 0;
omega[2] = a1 * w1 * sin(w1 * time);

NV_S (vel, =, 0.0);
vel[0] = 0;
vel[1] = 0;
vel[2] = 0;

}

thank you for your help, I extremely need it.