CFD Online Logo CFD Online URL
Home > Forums > Phoenics

Contaminant distribution

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

LinkBack Thread Tools Display Modes
Old   August 30, 2001, 12:45
Default Contaminant distribution
Posts: n/a
Assuming I wish to study contaminant distribution in an enclosure and already have the flow field calculated what is the best way of going about it without re-solving the continuity and momentum equations?

I know how to specify the contaminant location and generation rate.
  Reply With Quote

Old   August 31, 2001, 04:06
Default Re: Contaminant distribution
Posts: n/a
Dear Short

In principle, I think there is no way to do so. In such a systems the evolution of the flow field will depend on mixture between the contaminant and the base fluid. New values for density and viscosity should be included into eqs. for cell that contain both species.

I am afraid you will have to rerun your case including your contaminant sources.


  Reply With Quote

Old   August 31, 2001, 23:46
Default Re: Contaminant distribution
John C. Chien
Posts: n/a
(1). If the contaminant does not interact with air , and if the existence of the contaminant does not affect the computed velocity field, then you can compute the contaminant convection and diffusion separately. (2). That is, use the known velocity field for the convection terms. You will have to determine the diffusion coefficient for the contaminant in air or something like that. (3). You can also use the velocity field to do fluid particla tracing. and this will include the convection effect.(no diffusion) At least you can get a rough idea about the movement of the contaminant.
  Reply With Quote

Old   September 3, 2001, 07:16
Default Re: Contaminant distribution
Mike Malin
Posts: n/a
If the contaminant is passive, i.e. it does not influence the mean density field, then it should be possible to a RESTART calculation from the converged hydrodynamics field solving only for C1 (say) with the hydrodyamic field variables STOREd rather than SOLVEd. The turbulent and laminar Schmidt numbers are defaulted to unity, but can be changed via the input variables PRT(C1) and PRNDTL(C1).
  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
Numercial Simulation on Contaminant Distribution Apple L S Chan Main CFD Forum 4 October 24, 2011 07:01
CONTAMINANT TRANSPORT!!!!!!!!!!!!!!!!!!!!!!!! Anne FLUENT 0 March 20, 2006 07:13
contaminant modelling mhf Main CFD Forum 3 July 17, 2004 03:53
Contaminant Distribution in Air-Con Room Jules FLUENT 0 June 13, 2002 10:57
Contaminant Distribution in Air-con Room Jules Main CFD Forum 0 June 13, 2002 10:55

All times are GMT -4. The time now is 18:40.