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For multi-region cases the default location of blockMeshDict is now system/<region name> If the blockMeshDict is not found in system then the constant directory is also checked providing backward-compatibility
Example of an explicit coupling between OpenFOAM and an external application using the externalCoupled boundary conditions. The case is based on the buoyantCavity tutorial case, whereby on each iteration the 'hot' and 'cold' patch temperatures are incremented by 1K.