Path status in DPM BC UDF
I am writing a DPM boundary condition as a UDF.
After executing some lines of code, I would like to use the standard "escape" boundary condition. Is all I have to do to return the correct path status then? And which one should it be? return PATH_STOP; ?
Re: Path status in DPM BC UDF
Maybe I should mention, the ones available are:
Thank you, HS. It's helpful to know these functions.
The "escapse" condition seems to be attained at "wall" boundary condition when using "PATH_END," but I don't know if it works at the "pressure-outlet" boundary condition. Ther eare some explainations about the DPM boundary condition such as "reflect," "trap," ",escape" "wall-jet,""wall-film," and "user-defined," shown in the tag "DPM" of the boundary condition "Wall" (ANSYS14.0).
and could you tell me where and how to find look up functions like PATH_END or PATH_STOP, for I never see it in a manual and don't know its meaning. :(
Fluent UDF manual 2.5.1:
"For the return status PATH_ACTIVE, the particle continues to track. For the return status PATH_ABORT, the particle will be stopped and considered to be aborted. For the return status PATH_END, the particle will be stopped as well, but considered to have escaped from the domain."
If you want a particle to be "trapped", use PATH_ABORT; if you want a particle to be "escaped", use PATH_END.
Honestly, I don't know if there is any aspect in which Fluent treats "trapped" particles differently from "escaped" particles, but if I used this I try to choose the most logical condition in my situation.
As of Fluent 15.0, there are seven different statuses (see dpm_types.h, somewhere in your Fluent folder):
They are listed without explanation, and I don't know more. I would guess that PATH_BREAK indicated a break-up of a particle, and that PATH_NON_LOCAL_PERIODIC and PATH_NON_LOCAL might have to do with parallel issues. I don't know when PATH_STOP should be used, nor what it does.
Topic "Discrete Phase Boundary Condition Types" in ANSYS14.0 manual has some explanations about these boundary condition types: "reflect," "trap," ",escape" "wall-jet,""wall-film," and "user-defined."
> For the return status PATH_ACTIVE, the particle continues to track.
When "Wall" boundary condition and UDF file with "PATH_XXXX" replacing "PATH_ABORT" the code described in 2.5.1. DEFINE_DPM_BC 22.214.171.124. Example 1, whch is an example of inert particle rebound at wall, some functions such as "ABORT," "BREAK" and "STOP" can't be distinguished.
Somehow, "ACTIVE" seems have some particle dispeared??:confused:
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