[firedrake] Nonlinear multi-physics example with fully-coupled Newton solve

Dear Firedrake Developers, Is there a firedrake example for nonlinear multi-physics (multiple, two or more, coupled PDEs), which are solved with Newton's method in a fully-coupled way? Henrik -- Dipl.-Math. Henrik Büsing Institute for Applied Geophysics and Geothermal Energy E.ON Energy Research Center RWTH Aachen University ------------------------------------------------------ Mathieustr. 10 | Tel +49 (0)241 80 49907 52074 Aachen, Germany | Fax +49 (0)241 80 49889 ------------------------------------------------------ http://www.eonerc.rwth-aachen.de/GGE hbuesing@eonerc.rwth-aachen.de ------------------------------------------------------