[kedy6lsy]

Hi all, i am trying to code a udf for calculating the diffusion coefficient of each species for a non-unity lewis number

The code below is calculating the diffusion coefficient for the methane species, the code is suggested from the udf manual, but
I'm having error as fluent say :"Error: C:/Users/LEONGS~1/AppData/Local/Temp/LewisNumber.c.14616.3.c: line 19: structure reference not implemented"

Same error is also shown when i put original code from the udf manual

#include "udf.h"

/*** Non-unity Lewis Number UDF ***/

#define Le_CH4 0.97

DEFINE_PROPERTY(CH4_Diff,c,t)
{
real ktc; //thermal conductivity
real rho; //Density
real Cp; //Viscosity
real Diff; //Mass Diffusion Coefficient

int i; //Species Index
Material *sp; //Species Pointer
Property *prop; //Pointer to property array

mixture_species_loop(THREAD_MATERIAL(t),sp,i)
{
prop = (MATERIAL_PROPERTY(sp)); //
ktc = generic_property(c,t,prop,PROP_ktc,C_T(c,t)); //return ktc of species i
rho = generic_property(c,t,prop,PROP_rho,C_T(c,t)); //return rho of species i
Cp = generic_property(c,t,prop,PROP_Cp,C_T(c,t)); //return Cp of species i

Diff = Le_CH4*rho*Cp/ktc;
}
return Diff;
}

[vinerm]

You most likely are trying to interpret it. That won't work. You ought to compile it.

[kedy6lsy]

how can i do that?

[vinerm]

Since you are using Windows, you need to install VS or VC++ or MS Build Tools with C++ compiler.