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

DPM: Particle tracks stop at a "reflect" surface

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

Reply
 
LinkBack Thread Tools Display Modes
Old   April 16, 2004, 15:45
Default DPM: Particle tracks stop at a "reflect" surface
  #1
Confused
Guest
 
Posts: n/a
I have an unbaffled stirred tank reactor with a shaft and paddle rotating at 200 rpm. I have used MRF and realizable k-e to get a steady state solution. I have then used the discrete phase model to track a single particle dropped onto the free surface of the liquid. I have set the number of steps to 3x10^6 and the step length factor to 20. There are no inlets or outlets. I get a calculated residence time of approx 45s. However, when I view the particle track, I see the particle descending through the fluid in a circular fashion around the shaft until it hits the face of the paddle. When it hits the impeller it just stops as if it is trapped. This is confusing because in the Define-Boundary Conditions box, all walls are set to reflect and so is the impeller and the shaft. The impeller is stationary and the fluid is rotating (as I said, I have modelled using MRF).

Does anyone have any idea why this is happening? It's driving me completely mad!!! Any and all ideas gratefully received.
  Reply With Quote

Old   May 10, 2004, 10:36
Default Re: DPM: Particle tracks stop at a "reflect" surfa
  #2
zachi
Guest
 
Posts: n/a
are u using stochastic tracking?

regards

zachi!
  Reply With Quote

Old   May 11, 2004, 13:31
Default Re: DPM: Particle tracks stop at a "reflect" surfa
  #3
mantaray
Guest
 
Posts: n/a
i use stochastic tracking.

check the wall reflection coefficients in the wall boundary conditions panel. if they are zero it would cause particles to stop.
  Reply With Quote

Reply

Thread Tools
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 On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
DPM particle tracking in stirred tank parisa- FLUENT 1 August 7, 2012 12:03
unsteady DPM particle tracks animation Don Parsons FLUENT 4 May 18, 2012 17:14
Particle tracks stop? MG CD-adapco 7 December 3, 2004 12:01
Particle Tracks Ram FLUENT 2 January 25, 2003 12:08
Particle tracks Sridhar FLUENT 0 October 5, 2002 12:19


All times are GMT -4. The time now is 06:31.