A frequently performed operation in numerical algorithms, including SIMPLE and PISO, is the calculation of the face fluxes after the solution of the pressure equation:
Where:
- S are the surface area normal vectors;
- H is the H operator;
- A_{p} are the diagonal matrix coefficients from the U equation;
- p is the pressure; and
- indicates interpolation from cell volume centres to face centres.
Uses lduMatrix;;faceH to calculate the individual components.