CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS > CFX

Scalar Transport

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   August 29, 2009, 08:08
Default Scalar Transport
  #1
Senior Member
 
Join Date: Jul 2009
Posts: 260
Rep Power: 17
kingjewel1 is on a distinguished road
Dear all,

I'm interested to know why one would you a dimensionless scalar to model concentration. Could you clarify how if this could be used to represent dye in water for example? Given I only know the dye is completely of neutral buoyancy...

Thanks
kingjewel1 is offline   Reply With Quote

Old   August 29, 2009, 12:12
Default
  #2
Senior Member
 
Join Date: Jul 2009
Posts: 260
Rep Power: 17
kingjewel1 is on a distinguished road
My simulation involves a dye released from a point source at 0.01kgs^-1 within a room filled with air. Making it a specified scalar and hence dimensionless doesn't quite convince me, but I don't know the density of this dye. Any ideas?
kingjewel1 is offline   Reply With Quote

Old   August 30, 2009, 08:07
Default
  #3
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,665
Rep Power: 143
ghorrocks is just really niceghorrocks is just really niceghorrocks is just really niceghorrocks is just really nice
I am not sure exactly what you are asking - but isn't a natural unit for dye concentration kg of dye/kg of mixture - so kg/kg and therefore dimensionless.
ghorrocks is offline   Reply With Quote

Old   August 30, 2009, 10:23
Default
  #4
Senior Member
 
Join Date: Jul 2009
Posts: 260
Rep Power: 17
kingjewel1 is on a distinguished road
Quote:
Originally Posted by ghorrocks View Post
I am not sure exactly what you are asking - but isn't a natural unit for dye concentration kg of dye/kg of mixture - so kg/kg and therefore dimensionless.
Thanks ghorrocks. That seems good. Is there a way of calculating parts per million or some other volumetric concentration given that 0.01kgs^-1 are injected and there is always a constant volume within the vessel?
kingjewel1 is offline   Reply With Quote

Reply

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
Question about scalar transport osimonsimon OpenFOAM Running, Solving & CFD 33 August 21, 2020 11:45
Unsteady kE with scalar transport - Outlet-geometry heavely effects scalar transport christian_andersen OpenFOAM 0 June 25, 2009 04:00
transport equation for SGS scalar variance chinthakindi Main CFD Forum 0 April 27, 2004 10:26
Scalar Transport Equations David harvey FLUENT 1 January 31, 2004 07:15


All times are GMT -4. The time now is 17:53.