CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > ANSYS > CFX

Turbulent Dispersion in Particle Tracking

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

LinkBack Thread Tools Search this Thread Display Modes
Old   April 20, 2008, 22:56
Default Turbulent Dispersion in Particle Tracking
Posts: n/a
This is taken from ANSY Documentation: "If turbulent particle dispersion is enabled, you will need to track a much larger number of particles (usually an order of magnitude higher) since a stochastic method is used. This will greatly increase computational time; therefore, this is most often performed as a post-process where there is only one particle iteration."

I just want to ask what do you mean by "this is most often performed as a post process.."? How can I perform 1 particle iteration in CFX post? Or is it the same as running a smaller number of particles and after it converges, use it as initial values to run a single particle iteration in the Solver using larger number of particles? Thanks guys!

  Reply With Quote

Old   April 22, 2008, 18:29
Default Re: Turbulent Dispersion in Particle Tracking
Posts: n/a
I understand the same. By the way I am not able to obtain results with Lagrangian Particle Tracking in CFX. My case is a hydrocyclone and I have enabled all the possible forces in CFX-Pre (Turbulent dispersion, drag, gravity, pressure gradient).

Please share with us the level of satisfaction you have with results in your case. I would highly appreciate your information.
  Reply With Quote

Old   April 22, 2008, 22:02
Default Re: Turbulent Dispersion in Particle Tracking
Posts: n/a
I think the method used in tutorial 9 is much better than we understood wherein small number of particles are fully coupled to set the effect of particles to the continuous phase. While much larger number of identical particles are assigned as one way coupling. The solver does one particle iteration of one way coupled particles at the end of the solution stage.

I think it's better if you would run it first using all the forces except turbulent dispersion. Then use it as initial values when you include particle turbulence. If you have difficulty in convergence which happened to me at first, play around with the timescale to find the appropriate one for your problem. If you are new to particle tracking, try reading first the solver control manual. It helped me a lot.
  Reply With Quote


Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 Off
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Blood Damage Modelling via Particle Tracking in a Centrifugal Heart Pump scatman CFX 7 January 8, 2018 00:59
Turbulent dispersion of particle tracking in LES mittal OpenFOAM Programming & Development 4 February 23, 2011 18:01
massless particle tracking problem Renold FLUENT 0 January 26, 2011 14:23
Particle Tracking for ion Jun CFX 2 August 31, 2010 08:19
Turbulent Dispersion for Coal Combustion gravis CFX 2 March 23, 2010 23:56

All times are GMT -4. The time now is 19:10.