ENH: fused: 'fused' variants of explicit discretisation (!712) · Merge requests · Development / openfoam · GitLab

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Mattijs Janssens requested to merge feature-fusedDiscretisation into develop Dec 09, 2024

Summary

WIP. Explicit 'fv' operations avoiding intermediate surface fields. This helps with

memory allocations, caching
rewriting loops to be cell-based

Details of new models (If applicable)

Drop-in replacement for Gauss (fusedGauss) of fvc::laplacian, fvc::grad, fvc::div, fvc::snGrad. Currently in separate library.

Risks

slight truncation error difference since order of operations is different. laplacian only with scalar or vector weights supported so no tensor (for e.g. anisotropic heat-transfer)
disallows potential support for boundary conditions on surface fields