CFD Online Logo CFD Online URL
Home > Forums > CFX

Particle Tracking for ion

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

LinkBack Thread Tools Display Modes
Old   August 30, 2010, 10:01
Question Particle Tracking for ion
New Member
Join Date: Aug 2010
Posts: 12
Rep Power: 7
Jun is on a distinguished road
Hi all:

I am trying to use particle tracking on ion in the electrolyte, to see the behavior of ion.

I used particle transport solid, one-way coupling, Schiller Naumann for drag force, one uniform particle diameter.

The problem is that when the particle size is very small (~10e-10 meter), there are not tracks display in the CFX-POST, when the particle size is set to ~10e-4 meter, the particle tracks are available to display.

My question is if it is possible to use CFX particle tracking to model the very small size particle.
If the answer is yes, anybody please points out the right way for me to do it?
If the answer is no, what is the other option to model such small particle in the fluid?


Jun is offline   Reply With Quote

Old   August 30, 2010, 18:58
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 11,275
Rep Power: 88
ghorrocks is a jewel in the roughghorrocks is a jewel in the roughghorrocks is a jewel in the rough
No, this does not sound sensible. The forces on an atomic/ionic scale are very different to the micron and larger scale. For instance there is no viscous drag on an atom, it is just the inter-atomic forces. You cannot use particle tracks to do what you say without removing all the drag law stuff and replacing it with atomic interaction stuff.
ghorrocks is offline   Reply With Quote

Old   August 31, 2010, 08:19
New Member
Join Date: Aug 2010
Posts: 12
Rep Power: 7
Jun is on a distinguished road
Thank you for your reply, Glenn.

You are right. After more study, I realized that one possible way to do it is my own defined force on the atom through Fortran function.

Hope this will help others.
Jun is offline   Reply With Quote


particle tracking, small size particle

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 tracking Wenqing Zhang CFX 15 August 3, 2013 06:02
particle tracking in unsteady flow peterchen FLUENT 1 July 22, 2010 22:18
Number density tracking rather than particle tracking Rebecca Main CFD Forum 2 April 23, 2009 12:52
DPM UDF particle position using the macro P_POS(p)[i] dm2747 FLUENT 0 April 17, 2009 01:29
restarting lagrange (particle tracking) simulation dbdias CFX 0 September 22, 2007 19:26

All times are GMT -4. The time now is 19:48.