CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS > FLUENT > Fluent UDF and Scheme Programming

No data is written into UDM

Register Blogs Community New Posts Updated Threads Search

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   August 13, 2009, 19:37
Default No data is written into UDM
  #1
Member
 
Ivan
Join Date: May 2009
Posts: 85
Rep Power: 17
ivanbuz is on a distinguished road
I am doing unsteady flow around a 3D airfoil, and use the following UDF to obtain time-averaged pressure coefficient on the airfoil surface. the coefficient is stored in user defined memory (UDM) 1.

the UDF is successful interpreted into fluent.

after several time steps, I plot--xy plot the UDM 1, and they are all zero. it seems that no data is written into the UDM. Anyone point out where I do wrong? Thanks a lot!



/************************************************** **************************/
/* UDF to compute time-averaged pressure coefficient */
/************************************************** **************************/
/* be sure to allocate at least two UDM*/

#include "udf.h"

int n=0; /* number of time-step */
int zone_ID=5; /* zone ID of airfoil surface */

DEFINE_EXECUTE_AT_END(time_avr_PC)
{

Domain *domain = Get_Domain(1);
Thread *t = Lookup_Thread(domain, zone_ID);
real p_ref=0, den_ref=1.225, u_ref=21.911; /* reference pressue, reference density and reference velocity */
real q_ref=1/2*den_ref*u_ref*u_ref; /* reference dynamic pressure */
face_t f;

n++;

begin_f_loop(f, t)
{
F_UDMI(f,t,0) += F_P(f,t);
F_UDMI(f,t,1) = (F_UDMI(f,t,0)/n - p_ref)/q_ref;
}
end_f_loop(f, t)
}
ivanbuz is offline   Reply With Quote

Old   August 13, 2009, 19:49
Default
  #2
Member
 
Ivan
Join Date: May 2009
Posts: 85
Rep Power: 17
ivanbuz is on a distinguished road
I just found out that I forgot to hook the UDF. I did it and make sure I have allocated two UDM, and I resumed the computation and I got this error right after a time was completed.

Error: Chip: internal error: invalid builtin -1: pc=46
Error Object: #f

What does it mean? This is my first UDF, oh.. I am so frustrated ....
ivanbuz is offline   Reply With Quote

Reply


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 Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Segmentation violation louiza FLUENT 16 June 27, 2017 16:41
【Help】"Error: Update_Time_Level: invalid data" Chen FLUENT 2 August 24, 2014 08:51
export data at nodes Meenu FLUENT 1 December 30, 2011 02:24
ParaFoam : Written data doesnt have Full Regions Velan Main CFD Forum 0 January 12, 2009 04:55
How to update polyPatchbs localPoints liu OpenFOAM Running, Solving & CFD 6 December 30, 2005 18:27


All times are GMT -4. The time now is 06:53.