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

Turbulent Reynolds number

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

Reply
 
LinkBack Thread Tools Display Modes
Old   February 27, 2003, 04:55
Default Turbulent Reynolds number
  #1
Free_and_SIMPLE
Guest
 
Posts: n/a
Hey all,

which viscosity do I use if I am calculating the turbulent Reynolds number : Re_t = SQRT(k)*L_x/nu

Is it the laminar one or the effective/turbulent viscosity at that particular point?

Thanks. F&S
  Reply With Quote

Old   February 27, 2003, 05:40
Default Re: Turbulent Reynolds number
  #2
prasat
Guest
 
Posts: n/a
laminar one I think
  Reply With Quote

Old   February 27, 2003, 05:45
Default Re: Turbulent Reynolds number
  #3
gorka
Guest
 
Posts: n/a
Hi,

The viscosity you should use is the laminar one, since the turbulent Reynolds number stands for, precisely, a ratio between turbulent viscosity [C*rho*Velocity(sqrt(k))*L] and laminar viscosity.

Hope this helps.
  Reply With Quote

Old   March 3, 2003, 09:47
Default Re: Turbulent Reynolds number
  #4
Bredberg
Guest
 
Posts: n/a
Hi,

There exists some different definitions of the turbulent Reynolds number. For turbulence models I've come across the following: Re_T=k**2/(\eps\nu)=k/(\omega\nu) and Re_T=\nu_T/\nu the latter states it quite clearly I believe,

Regards Jonas
  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
Turbulence model for low Reynolds number flow? Nokadu Main CFD Forum 3 May 26, 2013 11:42
DecomposePar unequal number of shared faces maka OpenFOAM Pre-Processing 6 August 12, 2010 09:01
Reynolds Number matching in Cavity flow Endee Main CFD Forum 6 April 20, 2010 04:47
mesh file for flow over a circular cylinder Ardalan Main CFD Forum 6 April 17, 2010 23:40
Unaligned accesses on IA64 andre OpenFOAM 5 June 23, 2008 10:37


All times are GMT -4. The time now is 18:23.