#include "udf.h"
#include "prop.h"

DEFINE_DIFFUSIVITY(mean_age_diff, c, t, i)
{
return C_R(c,t)*2.88e-05+C_MU_EFF(c,t)/0.7;
}
DEFINE_UDS_FLUX(user_flux,f,t,eqn)
{
        return F_FLUX(f,t);
}
DEFINE_SOURCE(mean_age_source, c, t, dS, eqn)
{
real source;
dS[eqn]=0;
        source=C_R(c,t);
        return source;