3D parabolic equation for fluid flow
 

Hi, I am doing a fluid flow stimulation through a tube 15mm wide. The flow is laminar with a parabolic velocity profile. The maximum velocity is 0.1374m. I need to write a udf for the above 3D parabolic velocity profile. Was wondering is the below codes are correct as fluent do not seem to be able to interprete it. Not sure if the equations are correct. Thanks in advance if anyone could help..

#include "udf.h"

DEFINE_PROFILE(inlet_y_velocity,thread,position) {

real y[ND_ND];

real x,z;

face_t f;

begin_f_loop(f,thread)

{

F_CENTROID(y,f,thread);

x=y[0];

z=y[2];

F_PROFILE(f,thread,position)=.1374*(x*x+z*z)/(.0075*.0075)*.1374*2;

}

end_f_loop(f,thread);

}

Re: 3D parabolic equation for fluid flow
 

What's your error when interpreting the udf?

Re: 3D parabolic equation for fluid flow
 

Error: /scratch_o2k/public/bel/ss1.c: line 2: syntax error

Re: 3D parabolic equation for fluid flow
 

If you are getting this error in linux this may be due to a stray ^m character, by the editor in windows. run the command : dos2unix <filename.c> /* this will clean the file for linux*/ and then interpret in Fluent.