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6.3 Basic boundary conditions
The main basic boundary condition types available in OpenFOAM are summarised below using a patch field named . This is not a complete list; for all types see $FOAM_SRC/finiteVolume/fields/fvPatchFields/basic.
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fixedGradient: normal gradient of () is specified by gradient.
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mixed: mixed fixedValue/ fixedGradient condition depending on valueFraction where
(6.1) -
directionMixed: mixed condition with tensorial valueFraction, to allow different conditions in normal and tangential directions of a vector patch field, e.g. fixedValue in the tangential direction, zeroGradient in the normal direction.
OpenFOAM v12 User Guide - 6.3 Basic boundary conditions