[Oula]

Hello everyone

I need to write a UDF for a boundary condition of a gas flow rate. In my simulation using Fluent, I need to simulate a process lasts for ~ 5 hours. During the process a specific gas flow rate (53 cubic feet per hour) is injected through pipes to the fluid domain. The gas is injected at the beginning of the cycle lets say after few seconds and then it is injected at every hour of the flow time of the simulation.

So how can I write the suitable UDF for this flow rate?. Does the code below work for this case? how can I develop it to fit my case?. Please help me

#include "udf.h“

DEFINE_PROFILE(transient_mf, thread, position)
{
face_t f ;

real t = RP_Get_Real("flow-time"); /* to calculate the physical flow time*/

begin_f_loop(f, thread)
{
if (t==3600)
{
F_PROFILE(f, thread, position) = 53;
}
else
{
F_PROFILE(f, thread, position) = 0;}
}
end_f_loop(f, thread)
}

Regards
Oula