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

__CrossPowerLawCoeffs & BirdCarreauCoeffs__

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

Reply
 
LinkBack Thread Tools Display Modes
Old   January 26, 2011, 15:30
Lightbulb __CrossPowerLawCoeffs & BirdCarreauCoeffs__
  #1
Senior Member
 
maysmech's Avatar
 
Maysam
Join Date: Jan 2010
Posts: 325
Blog Entries: 2
Rep Power: 7
maysmech is on a distinguished road
Dear FOAMers,
What is CrossPowerLawCoeffs and BirdCarreauCoeffs?
Does it should be changed if nu be changed from 1e-5 to 1e-6?
Thanks in advance

Quote:
transportModel Newtonian;

nu nu [0 2 -1 0 0 0 0] 1e-05;

CrossPowerLawCoeffs
{
nu0 nu0 [0 2 -1 0 0 0 0] 1e-06;
nuInf nuInf [0 2 -1 0 0 0 0] 1e-06;
m m [0 0 1 0 0 0 0] 1;
n n [0 0 0 0 0 0 0] 1;
}

BirdCarreauCoeffs
{
nu0 nu0 [0 2 -1 0 0 0 0] 1e-06;
nuInf nuInf [0 2 -1 0 0 0 0] 1e-06;
k k [0 0 1 0 0 0 0] 0;
n n [0 0 0 0 0 0 0] 1;
}

Last edited by maysmech; January 26, 2011 at 15:53.
maysmech is offline   Reply With Quote

Old   January 26, 2011, 15:41
Default
  #2
Senior Member
 
Martin
Join Date: Oct 2009
Location: Aachen, Germany
Posts: 252
Rep Power: 10
MartinB is on a distinguished road
Hi,

CrossPowerLawCoeffs and BirdCarreauCoeffs will not be read since the transportModel is set to "Newtonian". A change of nu to 1e-6 therefor has influence to your simulation, but no influence to the other transport models.

Change the transportModel to "CrossPowerLaw" to use Cross Power Law or change it to "BirdCarreau" to use Bird Carreau Model.

More information about the Carreau model can be found here:
http://en.wikipedia.org/wiki/Carreau_fluid

If you are looking for variants of shear thinning fluids model feel free to ask...

Martin
MartinB is offline   Reply With Quote

Old   January 26, 2011, 15:55
Default
  #3
Senior Member
 
maysmech's Avatar
 
Maysam
Join Date: Jan 2010
Posts: 325
Blog Entries: 2
Rep Power: 7
maysmech is on a distinguished road
Quote:
Originally Posted by MartinB View Post
Hi,

CrossPowerLawCoeffs and BirdCarreauCoeffs will not be read since the transportModel is set to "Newtonian". A change of nu to 1e-6 therefor has influence to your simulation, but no influence to the other transport models.

Change the transportModel to "CrossPowerLaw" to use Cross Power Law or change it to "BirdCarreau" to use Bird Carreau Model.

More information about the Carreau model can be found here:
http://en.wikipedia.org/wiki/Carreau_fluid

If you are looking for variants of shear thinning fluids model feel free to ask...

Martin
Thank you very much.
maysmech 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



All times are GMT -4. The time now is 12:02.