OpenFOAM guide/LduMatrix;;faceH

A function built into the matrix to facilitate implementation of the H operator. Used by fvMatrix;;flux.

for (register label face=0; face<l.size(); face++)
{
    faceHpsi[face] = Upper[face]*psi[u[face]]
        - Lower[face]*psi[l[face]];
}

$\mathbf{H}_f \left ( \boldsymbol \psi \right ) = A_n \boldsymbol \psi_n - A_o \boldsymbol \psi_o$

Where:

• A are matrix coefficients;
• o and n are the owner and neighbour indices; and
• f is a face index.

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