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

dpm tracking

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

Reply
 
LinkBack Thread Tools Display Modes
Old   September 5, 2006, 21:45
Default dpm tracking
  #1
nan
Guest
 
Posts: n/a
Hi

I want to solve the problem about coal combustion burner. I am running DPM simulation using KE model, segregated solver, two way coupled calculation and Stochastic model.

I have set the Max no. of steps to 10000 and a length scale of 10. and the continious phase calculations per DPM is 10. when I run fluent, half of particles are incomplete and seems to be in recirculation flow. I changed the max no. of steps to 15000 and/or a length scale of 20, but it didn't make change so much.

What should I do to make escape them? or Can I ignore these incomplete particles?

Thanks in advance.

  Reply With Quote

Old   September 7, 2006, 11:53
Default Re: dpm tracking
  #2
Allan Walsh
Guest
 
Posts: n/a
What are you trying to get out of your model and what do you think the physical reality is? If these coal particles have burned out and it is just the ash left behind, and you don't care about tracking the ash, then you can probably ignore them.

What is the residence time of the particles? If it is +10 seconds, something in your model may be wrong because that is an unlikely condition. Do you have gravity turned on? Is the particle density realistic? Particle size? Would these particles, in reality fragment? coalesce?

Good luck.
  Reply With Quote

Old   September 7, 2006, 19:59
Default Re: dpm tracking
  #3
nan
Guest
 
Posts: n/a
Thanks for your reply, Allan.

I have gravity turned off. Particle density is 1500kg/m3, and size is 20 micron. The residence time of particles are 0-25 seconds, but particles burned out (combusting law was finished) till 2 seconds.

Your comment about ash relieved me, so I can start to check other points.

Thank you!

  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
Particle tracking in DPM Harpreet FLUENT 0 August 27, 2011 04:12
DPM particle tracking parisa- Main CFD Forum 2 June 15, 2011 05:12
Itīs possible to use this in unsteady dpm tracking? JSoares Fluent UDF and Scheme Programming 3 June 9, 2011 10:41
DPM tracking particle Clementine FLUENT 0 November 7, 2008 19:08


All times are GMT -4. The time now is 20:59.