[FCTCD]

Dear Colleagues,

I am at my first attempt on using UDF for my simulations. My target is to increase the rotational speed of a particular ZoneID (in Cell Conditions) every 120 time step with 10 iterations per time step. I wrote the following code, but I have few questions.
1 - Is the code correct for what I want to do?
2 - Should I write another udf for each different zoneID by changing the value specified (in my case 6, but in my simulation also 4 is rotating)
3 - I have a wall (impeller) in boundary conditions that I normally set at 0 constant rad/s relative do adjacent cells, should I write a UDF for that as well or it will change the rotational speed according to the cell zone authonomously?

Thanks in advance.

#include "udf.h"

#define Niter 1200 /*number of iterations per time step*/
#define omega_i 1250 */starting rotational speed*/
#define omega_f 1650 */final rotational speed*/
#define delta_omega */rot. speed increment per time step/*

DEFINE_ADJUST(mycode,domain){int zoneID; int iter = (nres==0)?(1):((int)count2[nres-1]);
float omega;
Thread *tc;

zoneID = 6;
tc = Lookup_Thread(domain,zoneID);
if ((iter%Niter)--0){omega = omega_i +(iter/Niter)*delta_omega;
	if (omega>omega_f) omega = omega_f;
	THREAD_VAR(tc).fluid.omega = omega;
	}

}