[Ahmed21]

hi
iam trying to write an UDF code to relate a DPM property like density to the particle temperature , but i can't refer to the particle temp like in this example in the manual

#include "udf.h"


DEFINE_PROPERTY(user_vis, cell, thread)

{

real temp, mu;

temp = C_T(cell, thread); /* i mean this line */

{

/* If the temperature is high, use a small, constant viscosity */

if (temp > 288.)
mu = 5.5e-3;

/* Otherwise, use a profile to get higher viscosity values */

else if (temp >= 286. )
mu = 143.2135 - 0.49725 * temp;

else
mu = 1.0;
}
return mu;
}

[`e`]

C_T(c,t) is a macro for the temperature within a cell and P_T(p) is for the particle temperature.

[sewgolam]

hallo guys,

I want ot change the absorption coefficient of heat particle which is dependent on the temperature of the particle.

can you help me out
how to do it

thanks

[sewgolam]

hallo guys,

i define a UFD for changing the absorption coefficient of the i jected particles in DPM.

DEFINE_DPM_PROPERTY(coal_cp, c, t, p, T)
{
real mp0 = P_INIT_MASS(p);
real mp = P_MASS(p);
real cf = C_DPMS_ABS(c, t);
C_DPMS_ABS(c, t) = 0.62;
Message("update particle mass %g\n", cf);
return 0.62;
}

but when plotting it absorption coeffiecient

graphic - particle track - DPM-absorption coeff
than i get different valeus

do somene what i'm doing wrong