I'm trying to make a UDF to define if a particle with a diameter > then X, when hit the wall, get Trapped or Reflect. I don't know which are the functions to say Trap or Reflect to the particle. Anyone can help me with this?

Thx in advance.

HI, it depend on your particle, if it is liquid, choose Trap,if it is solid, choose Reflect.

The particle is solid. I need an UDF to do it, with an IF condition. Anyone knows the Trap and Reflect macro?

DEFINE_DPM_BC. The usage is described fairly well in the manual.

That don't tell me about trap or reflect.

DEFINE_DPM_BC (dpm_collision,p,t,f,f_normal,dim) {

if (P_DIAM(p)<5e-6)

{

X

}

else

{

Y

} }

I already had this...but where is X and Y should be 2 functions that tell the program to make the particle REFLECT or TRAP. Is just that info i need. I found in dpm.h this: #define DPM_BC_REFLECT 2 #define DPM_BC_TRAP 3

Don't know how to use them, i tried all ways i could remember and the FLUENT still not trap particles.

Anyone knows how to solve this???

For trapped, use return PATH_END and increase the variable for the number of particles trapped. For reflect, return PATH_ACTIVE.

Thanks for your help. But when i use PATH_ACTIVE that don't let me choose the reflection parameters, there is other function?