UDF for time based variable to calculate velocity
 

Hello

I am currently doing a very simple simulation in Fluent by using UDF (CG MOTION)
I define my velocity like:
A=2;
w=2;
V=A*sin(w*time);

But what I plan to do next stage is to change the amplitude (A) from known value to time based value like A=2*time;
But if I write
w=2;
A=2*time;
V=A*sin(w*time);
the UDF can not be compiled by Fluent

can anybody help me

thanks a million

real t = RP_Get_Real(''flow-time");
have a try ~