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

Which is the most appropriate particle model

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

Reply
 
LinkBack Thread Tools Display Modes
Old   August 10, 2010, 11:20
Default Which is the most appropriate particle model
  #1
Member
 
james britton
Join Date: Jan 2010
Posts: 38
Rep Power: 6
jbritton is on a distinguished road
Hi all,

Working on an inhaler that has liquid particles instead or solid particles, interacting with an airflow and the particles in theory being carried to the outlet.

The problem im having is im not sure which model I should be using. I want to take into account that the liquid particles interact to form larger particles and then be able, at the outlet, to show the sizes of the particles that have reached it. The particles at the inlet are assumed to initially be the same size.

The behaviour is inhomogeneous much like the interaction of air bubbles in water, but cant find good values for break up and collation. As this model is designed more with bubbles in mind.

Did consider eularian and modelling the particles as solids, but not sure if its possible to model particles sticking together if they collide?

in short im a bit stuck, if you have any ideas that would be great, if you need any further details please let me know.
jbritton is offline   Reply With Quote

Old   August 10, 2010, 22:09
Default
  #2
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 9,150
Rep Power: 73
ghorrocks has a spectacular aura aboutghorrocks has a spectacular aura aboutghorrocks has a spectacular aura about
A lagrangian approach sounds like the way to go here, not eularian. Try a particle tracking approach. That has droplet breakup and coalescence models which may be suitable for you.
ghorrocks is offline   Reply With Quote

Old   November 9, 2011, 12:26
Default lagrangian + coalescence
  #3
New Member
 
John
Join Date: Apr 2009
Posts: 6
Rep Power: 7
Jinx is on a distinguished road
Hi Glenn,
sorry to resurrect an old post but this is relevant to a current project I'm working on.
I also need to model droplet agglomeration in a spray but haven't been able to find the Lagrangian coalescense options (particle breakup is available though) in Pre (v13). I want to use the Lagrangian rather than Eulerian approach because of the droplet size distribution at the inlet.
I've been through the help files and have spoken with Ansys support by phone but without success. I'd appreciate any help you can give.

Thanks!
Jinx is offline   Reply With Quote

Old   November 9, 2011, 18:11
Default
  #4
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 9,150
Rep Power: 73
ghorrocks has a spectacular aura aboutghorrocks has a spectacular aura aboutghorrocks has a spectacular aura about
It is not an area I have much experience in. Also have a look at the CFX Community site at www.ansys.com as it has some more tutorials.

Other than that you will have to look through the documentation to find what is available.
ghorrocks is offline   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
Particle transport and deposition & Drift Flux Model Peter023 Fluent UDF and Scheme Programming 2 July 3, 2014 03:28
Use of k-epsilon and k-omega Models Jade M Main CFD Forum 11 December 21, 2013 04:50
Macroscopic Particle Model Rizwan FLUENT 1 April 8, 2009 12:49
Reflection coefficient of particle in DPM model S.J.R FLUENT 1 June 9, 2007 19:03
DPM model w/ Wave model - errors in documentation HS FLUENT 0 April 12, 2006 04:37


All times are GMT -4. The time now is 08:39.