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

Multicomponent with Temperature dependent

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   September 14, 2008, 22:59
Default Multicomponent with Temperature dependent
  #1
SAKTI
Guest
 
Posts: n/a
Dear All,

I want to simulate the real exhaust gas component, the case is temperature dependent. Which thermophysical properties should I use? The multicomponent option doest concern the temperature dependent right? how about the polynomial option? will it concern the multicomponent effect?

Best regards Sakti
  Reply With Quote

Old   September 15, 2008, 00:48
Default Re: Multicomponent with Temperature dependent
  #2
usker
Guest
 
Posts: n/a
Multicomponent means concentration dependent, this option is suitable for multi-component mixtures. Depending on the density setting, STAR uses a constant specific heat Cv or Cp (or any other thermophysical property) for the background fluid. It also uses constant specific heats for any additional scalars present to calculate a mixture specific heat weighted according to the local concentration of each component.

Polynomial calculates the specific heat Cp (or any other thermophysical property) as a polynomial function of temperature (non-linear change of specific heat with temperature). If you click Define/Edit polynomial, it opens a special Polynomial Function Definition dialog in which polynomial coefficients may be created or edited, as necessary.

Regards
  Reply With Quote

Old   September 15, 2008, 02:20
Default Re: Multicomponent with Temperature dependent
  #3
SAKTI
Guest
 
Posts: n/a
Dear Mr. Usker

Thank you for your reply, what if the properties value both concentration and temperature dependent?

regards Byan
  Reply With Quote

Old   September 15, 2008, 23:09
Default Re: Multicomponent with Temperature dependent
  #4
usker
Guest
 
Posts: n/a
Then your Density will be a function of pressure and temperature.

Molecular Viscosity - MultiComponent, (if your Viscosity is temperature dependent, then you have to use Sutherland. Please, refer to Star-CD Methodology.

Specific Heat - Polynomial

Conductivity - Constant or Polynomial (usually Constant, but it depends on the flow conditions)
  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
Temperature Dependent Loads RP FloEFD, FloWorks & FloTHERM 3 March 22, 2012 02:46
question about a temperature dependent HTC Christoph Ley Phoenics 2 June 5, 2008 10:05
Time Dependent Temperature Dependent BC Analysis RP Main CFD Forum 1 March 28, 2008 02:22
Temperature dependent property kdarc OpenFOAM Running, Solving & CFD 3 March 27, 2007 17:21
to take K & Cp as temperature dependent kishore rathore FLUENT 1 February 17, 2004 05:33


All times are GMT -4. The time now is 19:02.