CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > General Forums > Main CFD Forum

Dimensionless Numbers

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   March 31, 2008, 07:31
Default Dimensionless Numbers
  #1
Kees
Guest
 
Posts: n/a
what is the use and improtance of dimensionless numbers in cfd

  Reply With Quote

Old   April 2, 2008, 10:15
Default Re: Dimensionless Numbers
  #2
gocarts
Guest
 
Posts: n/a
Dimensionless numbers (such as Reynolds Number, Mach Number) are a general concept (extensively used within fluid dynamics) to allow comparison between similar flow physics carried out at different scales and with different fluid properties. For more on the importance of the Reynolds Number try: http://www.symscape.com/node/348

In the cases of Reynolds and Mach numbers the actual values have significance. For example Mach > 1 is termed supersonic flow which has different physical characteristics to Mach < 1 (subsonic flow).

CFD can match the full scale geometry and fluid physics, so dimensionless numbers for scaling are less relevant. However, typically when presenting fluid flow results dimensionless qualities (such as lift and drag coefficients) are quoted. Hence the appearance of reference variables (such as area, pressure and velocity) in many CFD software packages.
  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
Dimensionless Numbers Chimuka Main CFD Forum 4 September 23, 2011 09:57
How to calculate dimensionless numbers Ra, Re, Gr kubus FLUENT 0 October 1, 2007 05:33
Dimensionless numbers kuba FLUENT 2 September 6, 2007 05:48
IcoFoam parallel woes msrinath80 OpenFOAM Running, Solving & CFD 9 July 22, 2007 03:58
Could anybody help me see this error and give help liugx212 OpenFOAM Running, Solving & CFD 3 January 4, 2006 19:07


All times are GMT -4. The time now is 23:56.