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- advectionDiffusion is frequently used within optimisation loops since it is differentiable. In shape optimisation, the re-computation of mesh distances is performed at the very beginning of a new optimisation cycle, due to inheriting from MeshObject. If the mesh quality is poor enough, the advectionDiffusion PDE might diverge and crash the run, before the problematic mesh is written to files for inspection. The default behaviour now is to check the mesh before solving the advectionDiffusion PDE and write the mesh points if some mesh check fails. - fvOptions can now be included in advectionDiffusion (necessary for topology optimisation of turbulent flows for models that include the distance field) - Minor changes in the numerical treatment of the diffusion term, to enhance stability