CFD Online Discussion Forums - Velocity(inlet Boundary)

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Velocity(inlet Boundary)

Hi everyone;

I simulated 3D water tank.
Changes in the Y direction is not important.
when i add the Velocity.c to fluent this error appear:

line 20: i: undeclared variable

#include "udf.h"
#define ZMIN 0.0
#define ZMAX 0.8
#define UH 0.063
#define UMEAN 0.15625
#define P 0.21
DEFINE_PROFILE(x_velocity,t,i)
{
real z, x[ND_ND], h;
face_t f;

h=ZMAX-ZMIN;

begin_f_loop(f,t)
{
F_CENTROID(x,f,t);
z=x[1];

if (z<=0.4)
F_PROFILE(f,t,i)=UH*pow(z/0.1,P);
else
F_PROFILE(f,t,i)=UMEAN;

}
end_f_loop(f,t)
}

what is problem?

I am pretty sure that the pow(x,y) function is a part of the math library.
Try adding #include "math.h" to the header.

udf.h takes care of including other file header files for math functions.

try defining the profile by:

Code:

begin_c_loop(c,t)

{

  C_CENTROID(x,c,t);

  ..

  ..

  F_PROFILE(c,t,i) = 

}

end_c_loop(c,t)