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

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OpenFOAM v12 User Guide - 6.3 Basic boundary conditions

What are the basic boundary conditions in OpenFOAM?

6.3 Basic boundary conditions