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Old   February 21, 2013, 04:12
Default Udf...define_profile
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Hwang Jin Sung
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Dear users.
i am student at the postech in korea

i hope to know solution how to exchange UDF C code.


/* neutral */
#include "udf.h"
#define ro 1.225 /* constants */
#define K 0.41
#define mu 1.7894e-05
#define C_p 1006.43
#define L 10000000000 /* Monin-Obukhov length */
#define z_0 0.02
#define q 0
#define u_fric 0.3899
#define g 9.81
#define T_w 292
#define C_mu 0.09

/* profile for kinetic energy */
DEFINE_PROFILE(k_profile,t,i)
{
real x[ND_ND];
face_t f;
begin_f_loop(f,t)
{
F_CENTROID(x,f,t);
F_PROFILE(f,t,i)=pow(u_fric,2.)/sqrt(C_mu);
}
end_f_loop(f,t)
}
DEFINE_PROFILE(dissip_profile,t,i)
{
real x[ND_ND];
real height;
face_t f;
begin_f_loop(f,t)
{
F_CENTROID(x,f,t);
height=x[1];
F_PROFILE(f,t,i)=u_fric/(sqrt(C_mu)*K*height);
}
end_f_loop(f,t)
}

DEFINE_PROFILE(velo_profile,t,i)
{
real x[ND_ND];
real height;
face_t f;
begin_f_loop(f,t)
{
F_CENTROID(x,f,t);
height=x[1];
F_PROFILE(f,t,i) = u_fric/K*(log(height/z_0));
}
end_f_loop(f,t)


it is 2D C code.. i want to exchange from 2D to 3D...

help me .... Dear Users ...^^
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Old   February 21, 2013, 10:59
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Alex
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Where exactly do you see the problem?
Do the formulas you used change in 3D?
Or is your 3D domain not aligned with the cartesian coordinates?
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Old   February 21, 2013, 21:06
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Hwang Jin Sung
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Quote:
Originally Posted by flotus1 View Post
Where exactly do you see the problem?
Do the formulas you used change in 3D?
Or is your 3D domain not aligned with the cartesian coordinates?

the problem is not match the cartesian coortinates !!

VBM in CFD Fluent is 3D coordinate system.
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Old   February 22, 2013, 05:00
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I recommend you review the chapter about coordinate transformations from your maths or mechanics lessons.

Or perhaps you could introduce local coordinate systems for each of the boundaries affected.
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