CFD Online Logo CFD Online URL
Home > Forums > FLUENT

Unsteady udf

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

LinkBack Thread Tools Display Modes
Old   April 21, 2008, 05:17
Default Unsteady udf
Posts: n/a
Hi Dear All I want to define the source term in Energy Equation. After compiling it in Fluent and starting to iteration, this error appears and solver goes out from running mode.This error is for """"C_T_M1(c,t)"""" for taking the temperature value in previous time step.I write this Text Command """""">Solve/set/expert""""" and then answering ""Yes"" to this question""keep temporary solver memory from being freed?"" but my problem has not been solved yet. Please Help me. Best Regards.

#include "udf.h"

#define C2 100.0

DEFINE_SOURCE(amir_source4,c,t,dtime,dS,eqn) { real x[ND_ND]; real con, source,delti,al,rol;

C_CENTROID(x,c,t); con = C2*0.5*C_R(c,t)*x[1]; al = RP_Get_Real("physical-time-step"); rol=C_T_M1(c,t);

source = -.000000001*C_T_G(c,t)[0]*C_T(c,t)*rol;

return source; }
  Reply With Quote

Old   April 22, 2008, 03:20
Default Re: Unsteady udf
Posts: n/a
instead of RP_Get.... , I would use al=CURRENT_TIMESTEP;

further, I am not sure, but You may need to define a derivation of your source (dS[eqn])

  Reply With Quote


Thread Tools
Display Modes

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 On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Unsteady Particle With unsteady Fluid Ali FLUENT 0 August 4, 2006 11:29
UDS UNSTEADY Arvind Phate FLUENT 0 August 27, 2005 13:17
about unsteady yanghua NUMECA 0 June 10, 2003 20:23
Unsteady DPM Alex Munoz FLUENT 0 May 12, 2003 20:36
about unsteady dahuilang Phoenics 0 November 23, 2001 03:45

All times are GMT -4. The time now is 15:34.