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

Boundary layer thickness

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

Reply
 
LinkBack Thread Tools Display Modes
Old   March 27, 2007, 10:00
Default Boundary layer thickness
  #1
Franny
Guest
 
Posts: n/a
Hi all,could anyone suggest the way to calculate boundary layer thickness?I need to plot th e velocity profile and see where its value is equals to 99 of the freestream value.I think i need to plot it along the polyline.What do you think?

Regards.

Franny
  Reply With Quote

Old   March 29, 2007, 07:08
Default Re: Boundary layer thickness
  #2
Adam
Guest
 
Posts: n/a
Unfortunatly, you have to do it the hard way!

1) Create a line perpendicular to the surface at the point of interest, making sure that the line is longer than the boundary layer thickness.

2) Export the velocity profile of that line.

3) Find 0.99xUfreetsream to aqcuire the boundary layer thickness.

4) You can use Matlab etc (trapeziodal function) to calculate disp, mom thickness and hence shape factor from the velocity profile.

I don't think you can do it in CFX itself, so you have to do it the long way.

Hope this helps

Adam
  Reply With Quote

Old   March 30, 2007, 18:28
Default Re: Boundary layer thickness
  #3
Omer
Guest
 
Posts: n/a
I was just wondering why you would need the boundary layer thickness. Is it because you need to have a resolved boundary layer for your model? If so , plotting Y+ contour would be a good idea.
  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
Boundary layer thickness ghazanfarzahedi Main CFD Forum 2 July 28, 2009 23:43
Boundary layer thickness calculation nat FLUENT 0 April 9, 2009 06:04
plotting boundary layer thickness graphs in a 3d Neelima FLUENT 1 March 29, 2006 18:04
Boundary Layer Thickness cfd-freak Main CFD Forum 3 March 27, 2003 13:18
boundary layer thickness Lee,jangho FLUENT 4 September 25, 2000 00:09


All times are GMT -4. The time now is 09:02.