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 January 28, 2011, 11:39 Unsteady DPM with steady solver #1 New Member   Join Date: Nov 2009 Posts: 3 Rep Power: 7 I believe from the user guide that it is possible to run unsteady tracking of a discrete phase with the steady flow solver. I can track particles with steady tracking and the steady solution. However, when I change to unsteady particle tracking, set a particle time step size, number of steps and start and stop time (both zero for one injection) there seems to be no particles injected. Can anybody help with this? I do not want to activate interaction with the continuous phase.

 May 23, 2011, 04:41 #2 Member   john Join Date: Nov 2010 Posts: 50 Rep Power: 6 did you find solution to your query?

 May 24, 2011, 13:01 #3 Member   alighaffari Join Date: May 2011 Posts: 31 Rep Power: 6 stop time for injection shoud be other than zero if you want to have injection!!

May 31, 2015, 04:11
solution: use non-zero mass flow rate in injection dialog box
#4
New Member

Juste
Join Date: Mar 2015
Posts: 14
Rep Power: 2
Quote:
 Originally Posted by elobb I can track particles with steady tracking and the steady solution. However, when I change to unsteady particle tracking, set a particle time step size, number of steps and start and stop time (both zero for one injection) there seems to be no particles injected.
i can see that it has been more than 4 years since u asked this, but I am still going to answer it, in case anyone else too has the same query...

i was also facing this same problem, but now i just found the solution, so thought of sharing it...

in steady DPM u can do the analysis with flow rate = 0 in the injection dialog box, but not in unsteady DPM.

when u use unsteady DPM u need to specify the flowrate..the formula for flowrate is

number of particles in a parcel * (mass of each particle / time step).

that's it.

and u can use start time and end time both zero. in this case particle will be injected only once, if that is what you want.

for more details, refer