chtMultiRegionFoam with anistropic diffusivity

Functionality to add/problem to solve

chtMultiRegionFoam/solidFoam supports anisotropic diffusivity. This gets calculated by converting at startup the thermo properties into the coordinate system.

It does not recalculate the properties

• if the thermo properties change (e.g. temperature varying alpha)
• if the coordinate system changes (e.g. cylindrical coordinate system, pivoting across second axis)

Target audience

Anyone using cht with changing solid properties.

Proposal

Two possibilities:

• have option to update/correct coordinate system and update anisotropic diffusivity accordingly
• not cache aniAlphas but calculate it on-the-fly

@mark @Sergio