# UDF Define_Init velocity profile

 Register Blogs Members List Search Today's Posts Mark Forums Read

June 9, 2013, 07:06
UDF Define_Init velocity profile
#1
New Member

Thomas Crepon
Join Date: Jun 2013
Posts: 3
Rep Power: 6
Hi everyone,

I really need your help for a scholar modeling. I want to create as an initial condition on inlet, a velocity profile quite simple : if y<2.5 then U=0, else U=2*y.

The problem is that I never used C language in my life and so as a complete rookie I'm quite lost...

Below you'll find what I've tried to write by copying other examples found on the net.

Thanks a lot for every little help you could give me (and sorry for my english)

Best Regards
Attached Files
 udfinit.c (282 Bytes, 33 views)

 June 14, 2013, 21:03 #2 New Member   Mahboobe Mahdavi Join Date: Mar 2013 Posts: 22 Rep Power: 6 do you still need help? I can help you

 June 19, 2013, 01:19 #3 New Member   Thomas Crepon Join Date: Jun 2013 Posts: 3 Rep Power: 6 It's a bit too late for my scholar deadline but nevertheless, I'm really interested to know how should I have done this ! So I welcome your help if it's still possible.

 June 19, 2013, 13:45 #4 New Member   Mahboobe Mahdavi Join Date: Mar 2013 Posts: 22 Rep Power: 6 I guess the problem is due to this part: y=F_CENTROID(y,f,t); you need to define real y[ND_ND]; then F_CENTROID(y,f,t); so your x coordinate will be y[0] and y coordinate will be y[1] -------------------------------------------------------------- #include "udf.h" DEFINE_INIT(udfinit,d) { cell_t c; Thread *t; real x[ND_ND]; real y; /* loop over all cell threads in the domain */ thread_loop_c(t,d) { /* loop over all cells */ begin_c_loop_all (c,t) { F_CENTROID(x,c,t); y=x[1] if y>2.5 C_U(c,t)=0 else C_U(c,t)=2*y } end_c_loop_all(c,t) } }

 Thread Tools Display Modes Linear Mode

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post Oli Fluent UDF and Scheme Programming 6 October 24, 2016 10:38 Bollonga Fluent UDF and Scheme Programming 1 October 6, 2015 12:53 Rashad FLUENT 0 February 27, 2008 15:57 Anant FLUENT 1 February 27, 2008 15:54 William177 FLUENT 1 February 3, 2008 07:47

All times are GMT -4. The time now is 12:17.