UDF for transient conduction.
 

Hi,
I am solving a transient conduction problem when a side of the plate is subjected to time and space varying boundary condition. I am using a udf which is as follows:

/************************************************** ******************** UDF for specifying a transient velocity profile boundary condition ************************************************** ********************/


#include "udf.h"


DEFINE_PROFILE(temp, t, i)


{

real x[ND_ND];


real x0, y0, time;


face_t f;


time = CURRENT_TIME;


begin_f_loop(f, t)


{


F_CENTROID(x,f,t);


x0 = x[0];


y0 = x[1];


F_PROFILE(f, t, i) = 100.0*sin(y0)*sin(3.14*time)+200.0*cos(y0)*cos(3.1 4*time);


}


end_f_loop(f, t)

}


Now the problem is after solving the problem in fluent, when i monitor the temperature at a point on the surface of the wall, I am not getting the temperature variation as given to the UDF. Does this problem is related to time step i am using? or there is the problem in the UDF? Any help would be appreciated...
Thanks..

Temp.varying with space and Time
 

Hi Ravindra

Whether you have sorted out the problem with your transient conduction udf? I am looking for a very similar udf for temperature varying with space and time..Could you please forward me the model udf for same.

Hi Ravindra,
Have u written ur profile right?
i dont c it is a function of x though u've defined x0
u've written it as a function of y only
inform d check
good luck