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 September 22, 2008, 14:52 Re: please help UDF for velocity profile in y-dire #3 raju Guest   Posts: n/a thanks for response but keith still it is not giving parabolic profile in y direction...if you are understanding my problem please help me thank you.

 September 22, 2008, 16:36 Re: please help UDF for velocity profile in y-dire #4 Keith Robinson Guest   Posts: n/a I apologize for committing an ID10T error in my previous post. The best thing I can suggest is to read the documentation for the DEFINE_PROFILE section. There is an example of the DEFINE_PROFILE for a pressure boundary layer that explains what each section means. The y=x[1] gives the y coordinate of the centroid. You will need to replace the y=x[1] statement with the appropriate statement.

 April 5, 2019, 07:08 defining temperature profile with UDF #5 New Member   soumya Join Date: Apr 2019 Posts: 1 Rep Power: 0 I am facing same problem related to defining temperature profile in y-direction. @raju did you get any solution for your problem?? Thank you

 April 5, 2019, 10:58 #6 Senior Member   Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,671 Rep Power: 65 Follow the example in the manual. Replace x[0] with x[1]. bietchetlien1995 likes this.

 April 12, 2019, 23:21 #7 New Member   Michael Fily Join Date: Feb 2019 Posts: 24 Rep Power: 7 #include "udf.h" DEFINE_PROFILE(log_velocity,thread,index) { real y[ND_ND]; real x,z; face_t f; begin_f_loop(f,thread) { F_CENTROID(y,f,thread); x = y[1]; z = y[2]; F_PROFILE(f,thread,index) = 26.22*log(x/2)/log(149.5/2); //Note here to express [28.19*log(x/2)/log(149.5/2)] in terms of (x,z); please get the //correct equation. } end_f_loop(f,thread) } ps/ it works for me in the 3d, try this one, change the fomular. This example with the change of velocity depending on the change of height (y-axis)