OpenFOAM v12 User Guide

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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 $\text{[math]}$ . This is not a complete list; for all types see $FOAM_SRC/ﬁniteVolume/ﬁelds/fvPatchFields/basic.

ﬁxedValue : value of $\text{[math]}$ is speciﬁed by value .
ﬁxedGradient : normal gradient of $\text{[math]}$ ( $\text{[math]}$ ) is speciﬁed by gradient.
zeroGradient : normal gradient of $\text{[math]}$ is zero.
calculated : patch ﬁeld $\text{[math]}$ calculated from other patch ﬁelds.
mixed : mixed ﬁxedValue/ ﬁxedGradient condition depending on valueFraction $\text{[math]}$ where

${ valueFraction = 1 corresponds to Ψ = refValue, 0 corresponds to ∂Ψ ∕∂n = refGradient. \relax \special {t4ht=$ (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