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Documentation for Neumann boundary conditions in OpenFOAM |
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December 11, 2021, 06:38 |
Documentation for Neumann boundary conditions in OpenFOAM
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New Member
Join Date: Dec 2021
Posts: 23
Rep Power: 4 |
Hi,
I was looking to implement some Neumann boundary conditions. I am taking a look at fixedGradient and https://www.openfoam.com/documentati...-gradient.html and mixed boundary conditions https://www.openfoam.com/documentati...d.html#details. They appear to be the same (on the latter I should set the valueFraction to zero), but the documentation seems weird: The fixedGradient will tell you that it is a Neumann condition defined as: Where should be the gradient normal to the face? Upon checking the code, the implementation seems to be on the evaluate function with: Code:
Field<Type>::operator= ( this->patchInternalField() + gradient_/this->patch().deltaCoeffs() ); On the other hand the mixed boundary is defined as: Here is specifically stated to be the patch normal gradient and the distance term appears in the denominator. Upon checking the code of the evaluate function I see: Code:
Field<Type>::operator= ( valueFraction_*refValue_ + (1.0 - valueFraction_)* ( this->patchInternalField() + refGrad_/this->patch().deltaCoeffs() ) ); So my question here is: Why two different documentations for something that seems to be the same ? Did I misunderstood something? |
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