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-   -   USING IF statement in a UDF for defining Velocity profile at Inlet (http://www.cfd-online.com/Forums/fluent-udf/104977-using-if-statement-udf-defining-velocity-profile-inlet.html)

amir2920 July 19, 2012 16:35

USING IF statement in a UDF for defining Velocity profile at Inlet
 
Hi,

I want to define a velocity profile at my inlet boundary condition. This is my UDF which is working for parabolic velocity, but I want to add a function for y<0.003 and another one for y>0.004, so I need to define and if statement. but UDF does not underestand y in the line (If y<0.003).
How could I define y in my IF statement?
Thanks.


#include "udf.h"
DEFINE_PROFILE(inlet_x_velocity, thread, position)
{

real x[ND_ND];
real y, v;
face_t f;



begin_f_loop(f,thread)
{
F_CENTROID(x, f, thread);
y = x[1];

If (y<0.003)
v= -228.*y+11.6;
else
v=-10200.*y+41.52
F_PROFILE(f, thread, position)=v;
}
end_f_loop(f, thread)

}

flotus1 July 19, 2012 17:04

Very strange. I can't see any error.

But instead of assigning the value of x[1] to the variable y, you could try using x[1] directly in the if-statement and the equation.

amir2920 July 19, 2012 17:09

Quote:

Originally Posted by flotus1 (Post 372476)
Very strange. I can't see any error.

But instead of assigning the value of x[1] to the variable y, you could try using x[1] directly in the if-statement and the equation.

Thank you for your reply,

I tried that before, did not work.

It gave me an error indicating that the undeclared variable in IF statement.
Does it underestand the y variable in If statement?

AGP May 23, 2013 23:46

Hey Amir, I am facing the same problem. My UDF doesn't understand the if statement. How did you fix your problem?


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