[Tushar_Telmasre]

I wrote this simple UDF for defining separate solid and liquid properties.
#include "udf.h"

DEFINE_PROPERTY(mass_wtd_k,c,t)
{
real sum = 0; int i;

real solid;
real liquid;

solid = 59;
liquid = 32;
sum = C_LIQF(c,t)*liquid+(1-C_LIQF(c,t))*solid;

return sum;
}

#include "udf.h"

DEFINE_PROPERTY(mass_wtd_cp,c,t)
{
real cp = 0; int i;

real solid;
real liquid;

solid = 200;
liquid = 231;
cp = C_LIQF(c,t)*liquid+(1-C_LIQF(c,t))*solid;

return cp;
}


It is getting interpreted. I hooked it to Conductivity and Specific heat. It is getting hooked also. But i am getting a segmentation fault while initialization.

What could be the reason.

Segmentation faults arise when solver tries to access an undefined memory location. but I cant decode which undefined location i am trying while initialization.

Please help.

[dpnascimento]

Are you using interpreted or compiled UDF´s?

[KaLium]

#include "udf.h" is mentioned twice. Could that cause some problems?

You can also remove "int i"

[Tushar_Telmasre]

i am using interpreted udf.

[dpnascimento]

I believe that the problem is that UDF´s for Cp can only be compiled. As far as for FLUENT 13.0
Check the manual:

Important:
If you would like to use a UDF to define specific heat properties, you must use the DEFINE_SPECIFIC_HEAT, as described in DEFINE_SPECIFIC_HEAT.

2.3.25.1.*Description
The DEFINE_SPECIFIC_HEAT macro can be used to define temperature dependent functions for specific heat and sensible enthalpy for fluid, solid and mixture materials (this does not include DPM particles). These functions must be defined in a consistent manner, that is, the enthalpy function should be the temperature integral of the specific heat function.

Important:
This option is not available with the premixed, non-premixed and partially premixed models, and should be used as a compiled UDF only.