CFD Online Logo CFD Online URL
Home > Forums > FLUENT

Dispersion Modelling

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

LinkBack Thread Tools Display Modes
Old   June 14, 2002, 07:05
Default Dispersion Modelling
Posts: n/a
Dear All

I am looking to model the movement of a plume of dye through a pipe flowing full with water (Re = 30000). The dye has the same density as the water and there is no chemical reaction. It appears there is two ways to do this in Fluent; through particle tracking and species modelling. I have played around with the two methods and they give different results for the parameter of interest. I have looked at the equations of motion for each method in the fluent manuals, but I am unsure that I have come to the correct conclusions so I am hoping someone can confirm (or correct me!) on the following.

When referring to equation 11.2.1 only the first three terms remain for my situation. The term J will be dominated by ut which comes from k and eps when using this model. Therefore does this mean the movement of dye is dominated by turbulence and not velocity gradients?

When using particle tracking with the stochastic model turned off the particles will move according the velocity field. When the stochastic model is turned on they deviate according a random function linked to the turbulent intensity.

If anyone has any further help or comments I will greatly appreciate it.

Regards, John
  Reply With Quote


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
Modelling turbulent aerosol dispersion Aino OpenFOAM 4 October 21, 2011 09:03
Turbulent Dispersion for Coal Combustion gravis CFX 2 March 24, 2010 00:56
Advice on multi-phase flow modelling Martin Main CFD Forum 3 October 14, 2008 05:16
Question on Dispersion Mike Marcu FLUENT 2 September 14, 2005 19:53
Air dispersion modelling Moied CFX 1 May 24, 2005 18:35

All times are GMT -4. The time now is 22:43.