Errors when interpreting UDF

elah599 · August 23, 2010, 08:27

I wrote a udf for thermal conductivity dependent on a temperature.
#include "udf.h"
DEFINE_PROPERTY(cell_thermalconductivity,cell,thre ad)
{
real ktc;
real temp = C_T(cell,thread);
ktc=(0.6*(1+(0.023*((pow(temp,1.2321))/(pow(10,(363.94/(temp-140))))))));
}
when I run fluent,I see this error:
Error: Floating point error: invalid number
Error Object: ()
could you help me?
thanks

coglione · August 24, 2010, 06:32

Your Define_Property UDF should at least return some value to the solver.
A last line like: return ktc; would do this.
cheers

elah599 · August 25, 2010, 04:04

thank you so much!
it worked

August 23, 2010, 08:27	Errors when interpreting UDF	#1
elah599 Member iman vasefi Join Date: Aug 2010 Posts: 39 Rep Power: 15	I wrote a udf for thermal conductivity dependent on a temperature. #include "udf.h" DEFINE_PROPERTY(cell_thermalconductivity,cell,thre ad) { real ktc; real temp = C_T(cell,thread); ktc=(0.6(1+(0.023((pow(temp,1.2321))/(pow(10,(363.94/(temp-140)))))))); } when I run fluent,I see this error: Error: Floating point error: invalid number Error Object: () could you help me? thanks

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August 24, 2010, 06:32		#2
coglione Senior Member Max Join Date: Mar 2009 Posts: 133 Rep Power: 17	Your Define_Property UDF should at least return some value to the solver. A last line like: return ktc; would do this. cheers

August 25, 2010, 04:04		#3
elah599 Member iman vasefi Join Date: Aug 2010 Posts: 39 Rep Power: 15	thank you so much! it worked