UDF Combustion Laws Switch
 

Hi guys, I am trying to start writing UDF's for the law switching in combustion cases so that I can get more control later down the line. I am starting with a simple one but for some reason it always goes straight to law 3 (DPM_LAW_BOILING) can anybody help me with this?

/************************************************** ********************
DPM_SWITCH UDF to manage the transition between laws for DPM
drying/combustion cases.
************************************************** *********************/

#include "udf.h" /* default requirement for Fluent UDF's*/
#include "dpm.h" /* just in case dpm laws are included here to expand the code */

DEFINE_DPM_SWITCH(DPM_switch_law, p, ci)

{
Material *m; /* Undocumented but to signify tracked material */

if(P_T(p)<DPM_EVAPORATION_TEMPERATURE(p,m))
{
P_CURRENT_LAW(p) = DPM_LAW_INITIAL_INERT_HEATING;
}

else if(P_T(p)>DPM_BOILING_TEMPERATURE(p,m))
{
P_CURRENT_LAW(p) = DPM_LAW_BOILING; /* Hazard guess it's called that since it's not documented */
}

else
{
P_CURRENT_LAW(p) = DPM_LAW_VAPORIZATION;
}

}

Hello Leepox,

You got more information about the different values that can take the macro P_CURRENT_LAW(p)?

Inert Heating or Cooling (Law 1/Law 6)
P_CURRENT_LAW(p) = DPM_LAW_INITIAL_INERT_HEATING;


Droplet Vaporization (Law 2)
P_CURRENT_LAW(p) = DPM_LAW_VAPORIZATION;


Droplet Boiling (Law 3)
P_CURRENT_LAW(p) = ??????

Devolatilization (Law 4)
P_CURRENT_LAW(p) = ?????

Surface Combustion (Law 5)
P_CURRENT_LAW(p) = ??????

Thanks

Hi, the laws are as named

DPM_LAW_DEVOLATILIZATION
DPM_LAW_SURFACE_COMBUSTION

not sure about boiling though.