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

definition norm of strain rateHi,
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 |

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