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Old   October 23, 2008, 08:33
Default DPM BC Trap or Reflect
  #1
RIK
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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.
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Old   October 23, 2008, 23:45
Default Re: DPM BC Trap or Reflect
  #2
romans
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HI, it depend on your particle, if it is liquid, choose Trap,if it is solid, choose Reflect.

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Old   October 24, 2008, 04:17
Default Re: DPM BC Trap or Reflect
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RIK
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The particle is solid. I need an UDF to do it, with an IF condition. Anyone knows the Trap and Reflect macro?
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Old   October 24, 2008, 12:42
Default Re: DPM BC Trap or Reflect
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Allan Walsh
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DEFINE_DPM_BC. The usage is described fairly well in the manual.
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Old   October 24, 2008, 13:06
Default Re: DPM BC Trap or Reflect
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RIK
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That don't tell me about trap or reflect.

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Old   October 24, 2008, 14:37
Default Re: DPM BC Trap or Reflect
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RIK
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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???
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Old   October 27, 2008, 13:04
Default Re: DPM BC Trap or Reflect *NM*
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Allan Walsh
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Old   October 27, 2008, 13:06
Default Re: DPM BC Trap or Reflect
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Allan Walsh
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For trapped, use return PATH_END and increase the variable for the number of particles trapped. For reflect, return PATH_ACTIVE.
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Old   October 28, 2008, 07:09
Default Re: DPM BC Trap or Reflect
  #9
RIK
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Thanks for your help. But when i use PATH_ACTIVE that don't let me choose the reflection parameters, there is other function?
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