The motivation for this PR is that currently the build fails on my
Ubuntu 17.10 laptop with two processes because that machine "only" has
8 GB of RAM (granted, the optimization options may have been a bit too
excessive). under the new scheme, each specialization of the simulator
is put into a separate compile unit which is part of
libopmsimulators. this has the advantages that the specialized
simulators and the main binary automatically stay consistent, the
compilation is faster (2m25s vs 4m16s on my machine) because all
compile units can be built in parallel and that compilation takes up
less RAM because there is no need to instantiate all specializations
in a single compile unit.
on the minus side, all specializations must now always be compiled,
the approach means slightly more work for the maintainers and the
flow_* startup code gets even more complicated.
in particular, this implied some changes to the MPI initialization
code. since dune-fem's GridPart class currently has issues with
CpGrid's implementation of loadBalance(), parallel computations still
do not work if dune-fem is around, but at least sequential ones now
do even if MPI is enabled.
This reduces the difference between flow and flow_mpi. For builds
without MPI, the fake helper from Dune is instantiated, which has
the same interface.
i.e. it now supports stuff like MULTFLT in the schedule
section. Possibly, the MPI-parallel code paths need some fixes. (but
if the geology is not changed during the simulation, the parallel code
will do the same as before.)
the most fundamental change of this patch is that the
reference/pointer to the DerivedGeology object is made
non-constant. IMO that's okay, though, becase the geology can no
longer assumed to be constant over the whole simulation run.
to be able to determine the threshold pressure from the initial
condition it needs to be able to access the initial condition, i.e.,
the initial simulator state, material properties object and gravity
constant need to be passed to the thresholdPressure() function.
Since the refactoring to using opm-material a material law manager for
the global grid was used. This meant that the properties used for
elements of the local grid were wrong. With this commit we set up a
manager that is based on the local grid only.
1. Added new parameter group string: "solver_approach" which can take
the values {direct, cpr, interleaved}.
2. Hierarchy:
i If a value is set in the parameter group that takes absolute
presedence.
ii If the Eclipse input deck asks for CPR - you get CPR.
iii You get the flow default - currently interleaved.
