Dear Friends,
Need your help in making code for forced vibration cylinder and free oscillating cylinder in Fluent.
Currently, I successfuly simulated once case study using the following UDF.
DEFINE_CG_MOTION(osc,dt,vel,omega,time,dtime)
{
Thread *t;
Domain *d = Get_Domain(1);
real x_cg[3], force[3], moment[3];
real accl, dv;
real mass = 0.2;
real wn = 12.0;
real k= mass * wn*wn;
real c = 2*mass*wn*0.00;
int i;
NV_S(vel, =, 0.0);
NV_S(omega, =, 0.0);
t = DT_THREAD(dt);
for(i=0;i
Hi,
By using "DEFINE_CG_MOTION" you are already prescribing the movement. In this case it seems to me you are prescribing no motion since vel and omega are intialized as zero and no longer modified.
In order to include the function you want, you would need to calculate the velocities and assign to vel[0] , vel[1] and vel vel[2] for x,y and z respectively.
Hope it helps for now.
Hello
i am trying to do the same and i have a question if you can help
did you simulate the free vibrations of the cylinder with system coupling (fluent and transient structure) and where did you use this UDF
thanks in advance
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