- **OpenFOAM Bugs**
(*http://www.cfd-online.com/Forums/openfoam-bugs/*)

- - **Shear rate error**
(*http://www.cfd-online.com/Forums/openfoam-bugs/62376-shear-rate-error.html*)

Line 61 viscosityModel.C shoulLine 61 viscosityModel.C should be
return (sqrt(2)*mag(symm(fvc::grad(U_)))); to comply with the standard definition of shear rate used in the Non-newtonian viscosity formulations: SR = sqrt(0.5 * D:D) where D = grad(U) + grad(U).T() |

Not all shear-dependent viscosNot all shear-dependent viscosity models use this definition of shear-rate and the one I originally implemented was defined in term of mag(grad(U)) which is what I implemented. Models defined in terms of other shear-rate definitions can be implemented in a way which over-rides the default simple function. Alternatively the form of the shear-rate could be made run-time selectable.
H |

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