CFD Online Discussion Forums

CFD Online Discussion Forums (
-   OpenFOAM Bugs (
-   -   definition norm of strain rate (

matthias September 17, 2010 09:47

definition norm of strain rate

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


mattijs September 17, 2010 10:07

We've finally got a proper bug reporting system :-)
Please report any OpenFOAM bugs on



All times are GMT -4. The time now is 02:27.