CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS > FLUENT

DPM particle time step

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   December 1, 2009, 03:31
Unhappy DPM particle time step
  #1
New Member
 
Amine
Join Date: Nov 2009
Posts: 1
Rep Power: 0
amos is on a distinguished road
Hi,
- I noticed that even if I choose a particular timestep for particles, when I look at its value with a fprintf(using udf) of P_DT(p), I never get the right particle time step, even if I use the DEFINE_DPM_TIMESTEP. Anyone encouters that kind of problem ?

- As en exemple, when I choose dt=1e-4, the time step evolves stochastically from 1e-5 to 1e-7 and hence, the particle trajectory is integrated many times and not once in one step of the continuous phase flow for which I fixed dt=1e-4. Is there a solution to fix the same timestep for the discret particle and the continuous phase ? and most of all to integrate only once the particle equation for trajectory for one fluid time step ?

-If it is not possible, I noticed that Fluent integrates the trajectories many times in one time step for the continuous phase before jumping to the integration of the second particle and so on. I would likle to know if there is a Fluent instruction to force it to jump to the next particle after intagrating only once the first particle, even if it comes back to integrate the first particle after looping over all particles in one continous phase time step) ?

For information, I am not doing interaction with continuous phase and I am injecting as group.
I hope that you understood what I mean ?
amos is offline   Reply With Quote

Old   January 4, 2020, 08:46
Default
  #2
New Member
 
oveis
Join Date: May 2014
Posts: 9
Rep Power: 12
oveis87 is on a distinguished road
Hi Amos,
Could you find any solution?
I have the same problem. Can anyone help?

Cheers,
oveis87 is offline   Reply With Quote

Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Superlinear speedup in OpenFOAM 13 msrinath80 OpenFOAM Running, Solving & CFD 18 March 3, 2015 05:36
IcoTopoFoam case is aborted deepblue17 OpenFOAM Running, Solving & CFD 25 December 2, 2010 14:20
Is there a way to write the time step size, time a may FLUENT 6 November 22, 2009 11:52
VOF özgür FLUENT 8 January 6, 2004 08:23
unsteady calcs in FLUENT Sanjay Padhiar Main CFD Forum 1 March 31, 1999 12:32


All times are GMT -4. The time now is 19:29.