this reduces the number of direct deck accesses in `EclProblem` in
favour of `EclipseState`-grid properties. as far as i can see,
directly using the deck object cannot fully be avoided because
`EclipseState` does not seem to provide internalized versions of all
these keywords yet.
- initialization only via Ecl Deck
- adds modification of relperms and cap-pressures for miscible runs
- adds TL mixing model for effective viscosity and density calculations
Tested on SPE1CASE2_SOLVENT_MISC_TL, SPE9_CP_CO2_MISC_TL, SPE5CASE1-3
and SPE3CASE1_SOLVENT_MISC
Conceptually this is IMO pretty questionable, since it adds a second
"gas phase" that does not mix with "ordinary" gas. I suppose the
reason why this extension was conceived by E100 is that if all you
have is hammer, everything looks like a nail...
Functionality-wise, this patch is still not fully complete because
miscibility of the solvent "phase" is not yet implemented. As far as I
can see, the API changes required by miscibility are quite limited,
though.
if the initial solution is explicitly given by the deck using the
PRESSURE, SWAT, etc. keywords, the specified state can be
thermodynamically impossible. To avoid inconsistencies, we use a flash
calculation to find a state that is in thermodynamic equilibrium and
exhibits the same masses as the explicitly specified solution. Since
the flash solver needs to compute quantities for all fluid phases, but
two-phase blackoil simulations usually do not specify the properties
of one phase, the flash solver crashed. This patch works around that
issue by simply not using the flash solver in the twophase case, i.e.,
the explicit initial condition must be thermodynamically consistent in
order to produce the stable results for a different choice of primary
variables.
hopefully this makes standalone `ebos` arrive at the same initial
condition as `flow_ebos` if both, SWATINIT and threshold pressures are
enabled. we need to calculate the initial condition twice either
threshold pressures and SWATINIT are enabled. (`ebos` and `flow_ebos`
diverged after OPM/opm-core#1129.)
the proposed patch is a kludge IMO, but in the light that in my
opinion, SWATINIT and threshold pressures are both physically not
justified and given the fact that SWATINIT must not be considered for
the threshold pressues should be considered to be a bug of the
reference simulator, I think the patch is okay.
we now store the maximum oil-water capillary pressure and apply it to
the material parameters later. this simplifies things within the
EquilInitializer somewhat and also allows external code (i.e.,
flow_ebos) to choose when SWATINIT gets applied.
this makes creating the grid a bit slower because the
transmissibilities need to be calculated twice: once for the
sequential grid and once for the distributed one. while corresponds to
the way `flow_legacy` does the load balancing and it should allow
better results, this does not seem to be the case for the Norne deck
if ZOLTAN is not available:
After loadbalancing process 3 has 4413 cells.
After loadbalancing process 2 has 12390 cells.
After loadbalancing process 0 has 13629 cells.
After loadbalancing process 1 has 21253 cells.
i.e., process 1 is responsible for almost 5 as many cells as process
3.
