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UDF for thermal conductivity

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Old   January 15, 2014, 14:51
Default UDF for thermal conductivity
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Bennia Ayoub
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Dear Freinds...
i want to define thermal conductivity of nanofluid , I wrote UDF but when i interpreted to fluent, it show me a message "temp definition shadows previous definition" what's mean ?
PHP Code:
#include "udf.h"
#define k_np 40 /**thermal conductivity  for nanoparticle Al2O3******/
#define FI 0.02 /************volume fraction**************************/
DEFINE_PROPERTY(nanofluid_Conductivity,c,t)
{
real k_f;       /***thermal conductivity for fluid(water)***********/
real k_nf;      /******thermal conductivity  for nanofluid*********/
real temp C_T(c,t); /****temperature******/
k_f= -0.000008 * (temp temp) + ((0.0062 temp) - 0.5388); 
k_nf = (((k_np + (k_f) - (* (k_f k_np)) * FI)/(k_np + (k_f) + (k_f k_np) * FI))) * k_f;
return 
k_nf;

Any help i will be grateful

Last edited by ayoub1989; January 16, 2014 at 15:21.
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Old   January 16, 2014, 11:20
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It means that the variable name "temp" is already in used somewhere else. Not in your file, but somewhere in Fluent's files.

This will probably not give a real problem, but to be sure, you could rename your variable name into something else.
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Old   January 16, 2014, 15:17
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thank you pakk , i renamed the variable and the UDF work without problem thanks again
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Old   January 20, 2014, 11:08
Default Nanofluid properties
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did you use compile or interpret for the UDF? I'm trying to use UDF for properties in a similar case but didn't work with me
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Old   January 22, 2014, 03:46
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Quote:
Originally Posted by salehorafi View Post
did you use compile or interpret for the UDF? I'm trying to use UDF for properties in a similar case but didn't work with me
I used interpreted , compiled and the udf work perfectly here's my email to contact me : ayoubbennia@gmail.com
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Old   August 18, 2014, 05:15
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I used interpreted , compiled and the udf work perfectly
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