UDF for 3D velocity profile

pichai · October 5, 2010, 05:52

Dear all,

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

Please help me.

lehoang_mai · October 5, 2010, 06:07

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!

pichai · October 5, 2010, 06:48

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 ?

lehoang_mai · October 5, 2010, 06:51

what did you mean? picture, isn't it?

pichai · October 5, 2010, 06:55

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.

lehoang_mai · October 5, 2010, 07:10

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!

October 5, 2010, 05:52	UDF for 3D velocity profile	#1
pichai New Member Join Date: May 2010 Posts: 18 Rep Power: 15	Dear all, Does anyone has a sample of UDF for velocity profile in 3D duct ? Please help me.

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October 5, 2010, 06:07		#2
lehoang_mai Member User_CFD Join Date: Mar 2010 Posts: 48 Rep Power: 16	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!

October 5, 2010, 06:48		#3
pichai New Member Join Date: May 2010 Posts: 18 Rep Power: 15	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 ?

October 5, 2010, 06:51		#4
lehoang_mai Member User_CFD Join Date: Mar 2010 Posts: 48 Rep Power: 16	what did you mean? picture, isn't it?

October 5, 2010, 06:55		#5
pichai New Member Join Date: May 2010 Posts: 18 Rep Power: 15	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.

October 5, 2010, 07:10		#6
lehoang_mai Member User_CFD Join Date: Mar 2010 Posts: 48 Rep Power: 16	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!