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

What does 'Calculated' Boundary Condition Mean in 0/nut file ?

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

Reply
 
LinkBack Thread Tools Display Modes
Old   August 27, 2014, 10:23
Default
  #1
Member
 
Pratik Nanavati
Join Date: May 2014
Location: Munich, Germany
Posts: 40
Rep Power: 3
nanavati is on a distinguished road
Hello All,

I am confused about the usage and meaning of, Calculated BC.

in many OF Tutorials it has been used in 0/nut file for inlet and outlet.

Can anyone please throw some light on it.

Many Thanks.

Last edited by wyldckat; September 24, 2014 at 15:23. Reason: repeated posts in 2 different threads
nanavati is offline   Reply With Quote

Old   August 27, 2014, 10:33
Default
  #2
Member
 
Join Date: Jun 2011
Posts: 52
Rep Power: 6
blacksquirrel is on a distinguished road
Hello nanavati,

calculated means, that the property you are referring to is already fully defined by the other boundary conditions and properties you defined in the constant folder.

For example nu_t (or mu_t) is defined via k and epsilon by
nu_t= C * k^2/epsilon

So OpenFOAM can calculate the boundary conditions for nu_t via the ones you gave it for k and epsilon. You only specify the wall-function for nu_t.

Regards
Squirrel
blacksquirrel is offline   Reply With Quote

Old   August 28, 2014, 03:54
Default
  #3
Member
 
Pratik Nanavati
Join Date: May 2014
Location: Munich, Germany
Posts: 40
Rep Power: 3
nanavati is on a distinguished road
Many Thanks for the Detailed Explanation.
nanavati is offline   Reply With Quote

Old   September 8, 2014, 10:15
Default
  #4
Senior Member
 
Tom Fahner
Join Date: Mar 2009
Location: Delft, Netherlands
Posts: 224
Rep Power: 10
tomf is on a distinguished road
Send a message via MSN to tomf Send a message via Skype™ to tomf
It means the values are calculated from the turbulence model and the values for k and epsilon (or omega) and not prescribed.

Regards,
Tom
tomf 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
Swak4FOAM 0.2.3 / OF2.2.x installation error FerdiFuchs OpenFOAM Installation 27 April 16, 2014 15:14
Error bulding swak4Foam sfigato OpenFOAM Installation 18 August 22, 2013 12:41
Question about heat transfer coefficient setting for CFX Anna Tian CFX 1 June 16, 2013 06:28
Error finding variable "THERMX" sunilpatil CFX 8 April 26, 2013 07:00
error while compiling the USER Sub routine CFD user CFX 3 November 25, 2002 16:16


All times are GMT -4. The time now is 20:07.