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-   -   User defined function for backflow temperature in fluent (http://www.cfd-online.com/Forums/fluent-udf/106841-user-defined-function-backflow-temperature-fluent.html)

harshit September 10, 2012 15:58

User defined function for backflow temperature in fluent
 
Hello everyone,
I am looking forward for making a UDF that calculates the area-weighted average of all the faces where backflow doesn't occurs and assign it as the backflow temperature. I have never done coding in fluent before, therfore I have the algo in my mind but couldn't find apt commands.
Can someone please brief me with some commands that will be useful to me and also there uses.
I will greatly appreciate your help.
Harshit.:)

macfly January 29, 2013 21:21

Here's a code that calculates the arithmetic mean temperature of outgoing flow in the x direction. It's ok if the outlet cell faces have the same area. Then the mean T is used in a profile.


#include "udf.h"
real T_mean;

DEFINE_ADJUST(u_outflow, domain,t)
{
real T_tot;
real u;
real counter = 0;

face_t f;
int ID = 20; /* outlet ID displayed in Fluent boundary conditions panel */
Thread *thread;
thread = Lookup_Thread(domain, ID);
begin_f_loop(f, thread)
{
u = F_U(f,thread); /* x velocity */
if (u >= 0)
{
T_tot += F_T(f,thread);
counter = counter + 1;
}
}
end_f_loop(f,thread)
T_mean = T_tot/counter; /* arithmetic mean T of outflow */
}



DEFINE_PROFILE(T_backflow, thread, position)
{
face_t f;
begin_f_loop(f, thread)
{
F_PROFILE(f, thread, position) = T_mean;
}
end_f_loop(f, thread)
}

macfly January 29, 2013 21:22

Nevermind the present post, I can't find how to erase it.:D


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