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-   -   Unsteady DPM with steady solver (http://www.cfd-online.com/Forums/fluent/84419-unsteady-dpm-steady-solver.html)

elobb January 28, 2011 11:39

Unsteady DPM with steady solver
 
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.

johnwinter May 23, 2011 04:41

did you find solution to your query?

alighaffari May 24, 2011 13:01

stop time for injection shoud be other than zero if you want to have injection!!

juste May 31, 2015 04:11

solution: use non-zero mass flow rate in injection dialog box
 
Quote:

Originally Posted by elobb (Post 292682)
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

http://www.arc.vt.edu/ansys_help/flu..._unsteady.html


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