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

Fluid / Particle Interaction

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

Reply
 
LinkBack Thread Tools Display Modes
Old   October 9, 2002, 09:14
Default Fluid / Particle Interaction
  #1
Alex
Guest
 
Posts: n/a
Hi! I have a (hopefully trivial, at leat for someone out there) problem: I am trying to simulate the acceleration of abrasive particles (garnet) in a high velocity fluid stream. I have a pressure in- and outlet and a surface particle injection (fluid/particle interaction switched on). The problem is: After iteration, the particles have in every position exactly the same speed as the fluid, so that they appear not to have any inertia. What am I doing wrong? Thanks in advance, Alex
  Reply With Quote

Old   October 10, 2002, 05:40
Default Re: Fluid / Particle Interaction
  #2
Vaibhav
Guest
 
Posts: n/a
hi i think u should try the fluid inlet and a solid inlet(high density fluid in eulerian- eulerian grannular model ) instead of the surface particle injection. that may help u . beacuse in surface particle injection solid behave as inerts. so they acuire same velocity as that of fliud.
  Reply With Quote

Old   October 10, 2002, 10:49
Default Re: Fluid / Particle Interaction
  #3
CFD Newbie
Guest
 
Posts: n/a
Have you turn on gravity ( a must)?

What is the density of your particles?, if small, inertial effects are not present.

Is your particle tracking in unsteady state?

Have you tried particle-flow interaction?

All these factors have an impact on the behavior of your particle tracks. Try all of them.

Cheers

CFD Newbie
  Reply With Quote

Old   October 11, 2002, 05:53
Default Re: Fluid / Particle Interaction
  #4
zahir
Guest
 
Posts: n/a
I am looking into moddeling a similar flow. I want to model diesel exhaust flow with very many different constiuants. is this possible in fluent. Any ideas. Thanks
  Reply With Quote

Old   October 21, 2002, 12:21
Default Re: Fluid / Particle Interaction
  #5
Sreedhar
Guest
 
Posts: n/a
Alex:

Your particles will have have more or less the same velocity as the fluid if the particle size and/or density is very small (in this case fluid inertia dominates the particle inertia)and if the number of particles is not large enough to consider a 2-way/4-way coupling of the multiple phases.

Also, as you would have observed, (for a 1-way coupling) the particles will follow the fluid streamlines all along unless there is any solid obstruction in their path. Hope this helps.
  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
Fluid Structure Interaction fw407 OpenFOAM Running, Solving & CFD 9 February 14, 2013 18:25
Transient analysis of particle flow with Fluid-Structure Interaction (FSI) Julian K. CFX 2 September 15, 2011 15:30
ANSYS problem in solving fluid fluid interaction Fayyaz CFX 0 July 24, 2006 09:03
interaction time between particle and eddies Steve FLUENT 0 April 10, 2001 18:17
Big particle interation with fluid in DPM olivia FLUENT 1 January 15, 2001 05:32


All times are GMT -4. The time now is 18:19.