[Ravindra123]

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..

[avi@lpsc]

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.

[harsh_999]

Originally Posted by Ravindra123

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..

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