CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > Siemens > STAR-CCM+

Calculating Convection and Diffusion

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   September 28, 2015, 15:21
Question Calculating Convection and Diffusion
  #1
New Member
 
Wade
Join Date: Jul 2015
Posts: 24
Rep Power: 10
wadeellis is on a distinguished road
Hello,

I using Star-CCM+ to simulate the flow of hot (750 C), pure helium out of a small (2 mm ID) hole into room temperature air at atmospheric pressure. My question is whether there is a way to tease out convection and diffusion information for helium into air and air into helium.

Thank you.
wadeellis is offline   Reply With Quote

Old   October 5, 2015, 20:30
Default
  #2
Senior Member
 
Join Date: Nov 2010
Location: USA
Posts: 1,232
Rep Power: 24
me3840 is on a distinguished road
I don't understand the question. Tease out?
me3840 is offline   Reply With Quote

Old   October 5, 2015, 20:59
Default
  #3
New Member
 
Wade
Join Date: Jul 2015
Posts: 24
Rep Power: 10
wadeellis is on a distinguished road
Sorry, I was trying to ask if there is a way to obtain numerical values for the convection and diffusion. For instance, you can export the values for temperature, velocity, mass fraction, etc. Is there a similar way to export convection and diffusion information?
wadeellis is offline   Reply With Quote

Old   October 5, 2015, 21:31
Default
  #4
Senior Member
 
Join Date: Nov 2010
Location: USA
Posts: 1,232
Rep Power: 24
me3840 is on a distinguished road
Shouldn't you be able to just make field functions for these? Maybe:
U-convection: div($Density*$$Velocity[0]*$$Velocity)
U-diffusion: div($DynamicViscosity*grad($$Velocity[0]))
me3840 is offline   Reply With Quote

Old   October 6, 2015, 12:14
Smile
  #5
New Member
 
Wade
Join Date: Jul 2015
Posts: 24
Rep Power: 10
wadeellis is on a distinguished road
Thank you for that suggestion. I have not done much with field functions yet. I will look into them and see if they will help me solve the problem I am working on.
wadeellis is offline   Reply With Quote

Reply

Tags
convection., diffusion

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
Convection Diffusion 1-D Matrix Problem balrog Main CFD Forum 1 November 3, 2014 13:34
Spectral Element DG and the Convection Diffusion Equation sspatelccny Main CFD Forum 0 June 30, 2012 17:35
Convection, diffusion and reaction Joao CFX 0 October 25, 2008 20:19
diffusion effect opposite to convection hasan karabay Siemens 0 December 5, 2006 06:59
Diffusion / convection I. Dotsikas Main CFD Forum 2 April 21, 1999 16:39


All times are GMT -4. The time now is 19:25.