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Keeping both functions to ensure that the octant ordering specified in
treeBoundBox is obeyed at the octree level, irrespective of the implementation
of the basic boundBox.

Use new "T" function to avoid duplicate registration of grad(U) object.

pointSolidMixture. chtMultiRegion tutorials and solvers

ENH: near-wall sampling : new 'patchInternalField' sampledSurface, new 'nearWallFields' functionObject