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-   -   definition norm of strain rate (http://www.cfd-online.com/Forums/openfoam-bugs/80178-definition-norm-strain-rate.html)

matthias September 17, 2010 09:47

definition norm of strain rate
 
Hi,

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

mattijs September 17, 2010 10:07

We've finally got a proper bug reporting system :-)
Please report any OpenFOAM bugs on http://www.openfoam.com/bugs.

Thanks,

Mattijs


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