[smkr]

I am modelling isothermal melting of the metals in FLUENT 17.2. I am unable to give different density for the solid and liquid at the melting point. Can any one please tell me about how to write an UDF for this.

Thank You!

[zobekenobe]

using define_property you can select the material and then in it's density tab hook the following macro


define the melting point and the solid and liquid density, and using an if else assign the required density and return it from the macro

#define "udf.h"
#define T_melting_point = 100;
#define solid_density = 10.0;
#define liquid_density = 2.0;


DEFINE_PROPERTY(udf_name, c, ct)
{
    real temp = C_T(c, ct);
    real metal_density;

    if(temp > T_melting_point)
        metal_density = liquid_density;
    else
        metal_density = solid_density;

    return metal_density

}

hope this helps

[AlexanderZ]

fluent has "solidification & melting" model
use Ansys Fluent User's Guide and Ansys Fluent Tutorial Guide to find detailed information

best regards