UDF for trap of dpm

January 31, 2007, 15:44

Hello, I wanted to trap particles as soon as certain condition is fullfilled (not on wall). For example, trapping particles on dis=2e-3 m where dis= distance from the wall and particle centre.

regards, HK

February 1, 2007, 15:24

You should be able to use the variable P_POS(p)[i] which is the position of the particle, p. The variable, i is the direction, x=0, y=1, z=2. (This is for Fluent 6.2, it was different in v6.1).

If particle position > dis then return PATH_END.

You can even increment the variable for the number of particles trapped, gvr_trapped?. Look for it in the dpm.h header file, if it is of interest. Good luck.

rdfing · November 8, 2016, 10:43

Quote:

Originally Posted by Allan Walsh
;138801

You should be able to use the variable P_POS(p)[i] which is the position of the particle, p. The variable, i is the direction, x=0, y=1, z=2. (This is for Fluent 6.2, it was different in v6.1).

If particle position > dis then return PATH_END.

You can even increment the variable for the number of particles trapped, gvr_trapped?. Look for it in the dpm.h header file, if it is of interest. Good luck.

Isn't DPM boundary Macro only detect and point to those particle that touch the wall?

January 31, 2007, 15:44	UDF for trap of dpm	#1
HK Guest Posts: n/a	Hello, I wanted to trap particles as soon as certain condition is fullfilled (not on wall). For example, trapping particles on dis=2e-3 m where dis= distance from the wall and particle centre. regards, HK

February 1, 2007, 15:24	Re: UDF for trap of dpm	#2
Allan Walsh Guest Posts: n/a	You should be able to use the variable P_POS(p)[i] which is the position of the particle, p. The variable, i is the direction, x=0, y=1, z=2. (This is for Fluent 6.2, it was different in v6.1). If particle position > dis then return PATH_END. You can even increment the variable for the number of particles trapped, gvr_trapped?. Look for it in the dpm.h header file, if it is of interest. Good luck.

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