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

Reynolds number basis

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

Reply
 
LinkBack Thread Tools Display Modes
Old   April 26, 2009, 19:55
Default Reynolds number basis
  #1
New Member
 
Join Date: Apr 2009
Posts: 6
Rep Power: 9
CFDstudent is on a distinguished road


How do I convert a Reynolds number based on momentum thickness (Re theta) to a Reynolds number based on boundary layer thickness (Re delta) ?

This is for turbulent flow in a pipe over a rough boundary.

any help would be greatly appreciated.

thanks!!!
CFDstudent is offline   Reply With Quote

Old   April 27, 2009, 13:41
Default
  #2
Senior Member
 
Aroon
Join Date: Apr 2009
Location: Racine WI
Posts: 148
Rep Power: 9
vishyaroon is on a distinguished road
In general the momentum thickness (for turbulent flows in pipe/channels) is about 7/72* BL thickness. So you can also use this ratio to compute your new Re.

You may also want to check if the following web-page is helpful.

http://www.see.ed.ac.uk/~bille/teach...Layers9&10.ppt
vishyaroon is offline   Reply With Quote

Reply

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
Mesh Refinement Luiz Eduardo Bittencourt Sampaio (Sampaio) OpenFOAM Mesh Utilities 41 January 17, 2013 03:43
DecomposePar unequal number of shared faces maka OpenFOAM Pre-Processing 6 August 12, 2010 09:01
BlockMeshmergePatchPairs hjasak OpenFOAM Native Meshers: blockMesh 11 August 15, 2008 07:36
Unaligned accesses on IA64 andre OpenFOAM 5 June 23, 2008 10:37
Trimmed cell and embedded refinement mesh conversion issues michele OpenFOAM Other Meshers: ICEM, Star, Ansys, Pointwise, GridPro, Ansa, ... 2 July 15, 2005 04:15


All times are GMT -4. The time now is 03:55.