|
[Sponsors] |
January 24, 2012, 21:31 |
Particle/Injection Questions
|
#1 |
New Member
John
Join Date: Jan 2012
Posts: 3
Rep Power: 14 |
Hey all, I've got some questions about the dpm model in Fluent. First, how can I get the particle ID number when using the macro DEFINE_DPM_INJECTION_INIT? I want to base the particle velocity on the ID number, but apparently p->part_id is not included in this macro (returns a value of -1 when I tried it). I also tried putting Tracked_Particle *tp along with Particle *p and this didn't work either.
Next, I have set up a group injection in which I am injecting a specific amount of particles all at once. I set the start and stop time to 0, make the amount of streams equal to the total number of particles, and set different values for the first and last point z position, based on some experimental data. The question is, how do I specify the flow rate? I believe it is particle mass / particle time step. Is this correct? Lastly, I have been having some convergence issues. I suspect it is related to the fact that I set the drag force equal to 0 (through DEFINE_DPM_DRAG) in the beginning until a specified time, and the discrete phase and continuous phase are coupled. I don't remember having any problems before, when I was simply calculating the drag with this macro and returning it to Fluent. Any thoughts on this? Any help is greatly appreciated! |
|
Tags |
dpm, flow rate, injection, particle id |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Wall functions - questions about implementation | AlmostSurelyRob | OpenFOAM Programming & Development | 44 | May 6, 2020 10:11 |
possible interview questions | atturh | Main CFD Forum | 1 | February 21, 2012 08:53 |
NACA0012 Validation Case Questions | ozzythewise | Main CFD Forum | 3 | August 3, 2010 14:39 |
Few questions | phi | FLUENT | 0 | March 4, 2005 09:23 |
turbulence modeling questions | llowen | Main CFD Forum | 3 | September 11, 1998 04:24 |