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UDF for 3D velocity profile

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Old   October 5, 2010, 05:52
Default UDF for 3D velocity profile
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Dear all,

Does anyone has a sample of UDF for velocity profile in 3D duct ?

Please help me.
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Old   October 5, 2010, 06:07
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This is typical UDF, you can use:
--------------------------------------------------------------------------------
#include "udf.h"

DEFINE_PROFILE(inlet_x_velocity, thread, position)
{
real x[ND_ND];
real y,z,Vmax;
face_t f;

begin_f_loop(f, thread)
{
F_CENTROID(x,f,thread);
y = x[1];
z = x[2];
//Vmax = 20.//
F_PROFILE(f, thread, position) = Vmax;
}
end_f_loop(f, thread)
}
---------------------------------------------------------------------------------
In this profile velocity is = 20m/s. for other profile(parabol,hyperbol....) chage it in function F_PROFILE.
Best wish for you!
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Old   October 5, 2010, 06:48
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Thank so much lehoang_mai.

do you mind if I need your help agian ?

Could you post an example of 3D of velocity boundary layer on flat plate ?
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Old   October 5, 2010, 06:51
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what did you mean? picture, isn't it?
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Old   October 5, 2010, 06:55
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sorry, I mean UDF of velocity profile on flat plate.

I think velocity profile on flat plate is like my problem that is the wind on the earth surface

thank in advance for your help.
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Old   October 5, 2010, 07:10
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I think, fluent can read UDF for all surfaces(earth,plate...), with them you hook UDF. Try to write your UDF and hook it in Fluent.
Nice for you!
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