Hi,

Can anybody tell me how to write a udf for pressure changing with time? It is an unsteady formulation problem.

If it's a basic function of t at an inlet you could use something like:

#include "udf.h"

DEFINE_PROFILE(inlet_x1_pressure, thread, index) { face_t f; real t = RP_Get_Real("flow-time");

begin_f_loop (f,thread) {

F_PROFILE(f,thread,index) = (some function of t) }

Hi,

Could you please elaborate your explanation. I could not understand.

It depends on how your inlet varies with time, does it obey an algebraic function or have you just got values at different points in time?

Hi,

I found the problem and I could rectify it. Thanks for ur help.