CFD Online Discussion Forums - define_on_demand:Initialization of a scalar

CFD Online Discussion Forums (https://www.cfd-online.com/Forums/)

- Fluent UDF and Scheme Programming (https://www.cfd-online.com/Forums/fluent-udf/)

- - define_on_demand:Initialization of a scalar (https://www.cfd-online.com/Forums/fluent-udf/189819-define_on_demand-initialization-scalar.html)

define_on_demand:Initialization of a scalar

How to use a define_on_demand macro to initialize a scalar in the field?

This is for all cells:

Code:

DEFINE_ON_DEMAND (scalar_init) 

{

  float x = 1.0; /*your value here*/

  Thread *thread;  

  cell_t cell;   

  Domain *domain = Get_Domain(1);         

  thread_loop_c(thread,domain)     

  {       

    begin_c_loop(cell,thread)              

    {       

    C_UDSI(cell,thread,0) = x;        

    }       

    end_c_loop(cell,thread)     

  }  

}

Thank you so much for the reply.
Actually, I am looking for assigning a constant value('0') for all the cells in a particular thread at the start of the calculation.
I wrote my UDF like this

#include "udf.h"

DEFINE_ON_DEMAND(rec)
{
Domain *d;
int zone_id=3;
Thread *t = Lookup_Thread(d,zone_id);
cell_t c;
d = Get_Domain(1);
thread_loop_c(t,d)
{
begin_c_loop(c,t)
{
C_UDMI(c,t,0) = 0;
}
end_c_loop(c,t)
}
}

Then I interpret this udf. but i dont know how to proceed further.
how can i assign the value '0' for all the cells at the beginning of calculation?
Will it assign automatically after i interpret the udf?

Do you have some non-zero values in UDM-0?

You have to use the DEFINE_ON_DEMAND - macro with manual command.

http://jullio.pe.kr/fluent6.1/help/h...-use-on-demand

Or you can use the Fluent patch panel:

https://www.sharcnet.ca/Software/Flu...g/node1035.htm

Thank you so much...:)