CFD Online Logo CFD Online URL
Home > Forums > OpenFOAM Bugs

definition norm of strain rate

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

LinkBack Thread Tools Display Modes
Old   September 17, 2010, 09:47
Default definition norm of strain rate
Matthias Walter
Join Date: Mar 2009
Location: Rostock, Germany
Posts: 63
Rep Power: 10
matthias is on a distinguished road
Sponsored Links

the norm of the strain rate tensor is defined as mag(S) = sqrt( 2 * S_ij S_ij ) where S_ij = 1/2 ((grad(U)+grad(U)^T) = symm(grad(U)). OF defines mag(S) = sqrt(S_ij S_ij) , both expressions differ in the factor of sqrt(2).
However, it could be important for the determination of tau_ij in the turbulence models(i.e. Smagorinsky)!

Is it a possible bug?

best regards

matthias is offline   Reply With Quote
Sponsored Links

Old   September 17, 2010, 10:07
Super Moderator
Mattijs Janssens
Join Date: Mar 2009
Posts: 1,419
Rep Power: 18
mattijs is on a distinguished road
We've finally got a proper bug reporting system :-)
Please report any OpenFOAM bugs on


mattijs is offline   Reply With Quote


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
strain rate in UDF Paulina FLUENT 11 November 20, 2014 04:06
OpenFOAM static build on Cray XT5 asaijo OpenFOAM Installation 9 April 6, 2011 12:21
strain rate magnitude ahmadbakri STAR-CCM+ 1 June 3, 2010 13:03
Strain rate. MM? Main CFD Forum 1 February 15, 2006 09:55
strain rate at arbitrary position in a cell K. Kevala FLUENT 0 February 4, 2004 18:14

Sponsored Links

All times are GMT -4. The time now is 23:26.