The vector \(\vec{d}\) joining two cell centres is parallel to the normal direction of the inter-connecting face.

\[\snGrad Q = \frac{Q_P - Q_N}{| \vec{d} |}\]

Properties🔗

• Calculated using a central difference scheme using the mesh delta coefficients
• Any non-orthogonality is ignored

Usage🔗

The scheme is specified using:

snGradSchemes
{
    default         none;
    snGrad(Q)       orthogonal;
}

Further information🔗

Source code

• Foam::fv::orthogonalSnGrad