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

One equation eddy

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

Reply
 
LinkBack Thread Tools Display Modes
Old   July 12, 2010, 16:33
Default One equation eddy
  #1
Senior Member
 
Rickard
Join Date: May 2010
Location: Lund, Skåne, Sweden
Posts: 143
Rep Power: 7
Rickard.Solsjo is on a distinguished road
If I change the turbulenceproperties from RAS to LES the one equation eddy model (sth like that) is solved.
I tried looking at the code but can someone tell me in words how it works ?

Thx
Rickard.Solsjo is offline   Reply With Quote

Old   July 13, 2010, 23:03
Default
  #2
Senior Member
 
wayne.zhang
Join Date: Mar 2009
Location: Shanghai, Shanghai, P.R.China
Posts: 307
Rep Power: 9
waynezw0618 is on a distinguished road
Send a message via MSN to waynezw0618 Send a message via Skype™ to waynezw0618
there are two examples in pisoFoam
waynezw0618 is offline   Reply With Quote

Old   July 14, 2010, 04:52
Default
  #3
New Member
 
Join Date: Jun 2010
Posts: 23
Rep Power: 7
NorbertB is on a distinguished road
Hi Rickard,

Even if I cannot explain you exactly this model, you could find some help in the following threads :

# First thread (4 pages, must see)
# Second thread, shorter but still relevant
# Eugene's thesis

Hope it helps
NorbertB is offline   Reply With Quote

Old   July 14, 2010, 05:28
Default
  #4
Senior Member
 
Rickard
Join Date: May 2010
Location: Lund, Skåne, Sweden
Posts: 143
Rep Power: 7
Rickard.Solsjo is on a distinguished road
I mean of course how the one equation eddy is solved, not how it is implemented
Rickard.Solsjo is offline   Reply With Quote

Old   March 31, 2011, 16:36
Default
  #5
Senior Member
 
maysmech's Avatar
 
Join Date: Jan 2010
Posts: 347
Blog Entries: 2
Rep Power: 8
maysmech is on a distinguished road
Quote:
Originally Posted by Rickard.Solsjo View Post
I mean of course how the one equation eddy is solved, not how it is implemented


I have same question.
maysmech is offline   Reply With Quote

Old   April 1, 2011, 02:20
Default
  #6
Senior Member
 
Rickard
Join Date: May 2010
Location: Lund, Skåne, Sweden
Posts: 143
Rep Power: 7
Rickard.Solsjo is on a distinguished road
Norbert is right, just read Eugene's thesis.
Basically, the subgrid scale (eddy) viscosity comes into some of the terms in the governing equation. To solve this, the eddy viscosity is modeled similarly as in the smagorinsky case but with a subgrid scale turbulent kinetic energy which is solved with another transport equation.
Something like
nu(sgs)=C(nu)sqrt(K(sgs))*filterwidth.
Just look at eugenes thesis
Rickard.Solsjo 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
Calculation of the Governing Equations Mihail CFX 7 September 7, 2014 06:27
Constant velocity of the material Sas CFX 15 July 13, 2010 08:56
Viscosity and the Energy Equation Rich Main CFD Forum 0 December 16, 2009 15:01
mass flow in is not equal to mass flow out saii CFX 2 September 18, 2009 08:07
continuity equation Rafal Main CFD Forum 4 November 29, 2006 10:27


All times are GMT -4. The time now is 19:50.