MPC

Multi-process-couplers or MPCs couple other PKs. They also are PKs themselves, in that they implement the PK interface. So MPCs can also couple other MPCs. There are a few common “base” MPCs which do the simplest form of coupling – sequential and globally implicit (with a diagonal preconditioner). Then there are specific couplers which know more about their coupled sub-PKs, and can do more complicated things (for instance, adding off-diagonal block entries to the preconditioner).

MPCs are also used to couple across domains – for instance integrated hydrology is a surface+subsurface flow coupler. They also can do fancier things like drape a bunch of subgrid columns off of a mesh, or other things. Think of these as the custom couplers.

• Base MPCs
• Physical MPCs
• Globalization Delegates