The B matrix is basically a component-wise multiplication
with a vector followed by a parallel reduction. We do that
reduction to all ranks computing for the well to save the
broadcast when applying C^T.
that simplifies the code a bit and will work with
distributed wells. Previously, we assumed that all
non-shut perforations are stored locally. That does
not hold any more.
We don't need to do the calculations in terms of EvalWell when we're
going to reduce this to the .value() before calling the PI/II
calculation routine. We can also get by with a simpler approach to
computing the II by assuming we always inject pure phases and no
cross flow in injectors.
Suggested by: [at]atgeirr
This commit makes the PI/II calculation more closely mirror the
approach taken when computing connection flow rates. In particular,
we switch to using total mobility, mixing and volume ratios for
injecting connections while producing connections continue to use
the phase mobilities and formation volume factors derived from
conditions in the connecting cells. We also include dissolved
gas/oil ratios and vaporised oil/gas ratios in order to fully
capture the surface flow conditions.
We split the handling of producing/injecting connections out to
separate helper functions in order to make the overall logic in
updateProductivityIndex() more manageable.ex() more manageable.
This commit ensures that we calculate the well and connection level
per-phase steady-state productivity index (PI) at the end of a
completed time step (triggered from endTimeStep()).
We add a new data member,
BlackoilWellModel<>::prod_index_calc_
which holds one WellProdIndexCalculator for each of the process'
local wells and a new interface member function
WellInterface::updateProductivityIndex
which uses a per-well PI calculator to actually compute the PI
values and store those in the WellState. Implement this member
function for both StandardWell and MultisegmentWell. Were it not
for 'getMobility' existing only in the derived classes, the two
equal implementations could be merged and moved to the interface.
We also add a new data member to the WellStateFullyImplicitBlackoil
to hold the connection-level PI values. Finally, remove the
conditional PI calculation from StandardWell's well equation
assembly routine.
Implements gas lift optimization for a single StandardWell. Support for
gas lift optimization for multi-segment wells, groups of wells and
networks is not implemented yet.
The keywords LIFTOPT, WLIFTOPT, and VFPPROD are used to supply parameters for
the optimization. Also adds support for summary output of liftgas
injection rate via keyword WGLIR.
We hold a shared pointer to the umpfack solver that gets reset
whenever the matrix is changed. When applying the decomposition
we will be recomputed if the solver pointer is null.
Note 1:
The rate vectors used for the pressure equation now contains derivatives wrt to the upwind segment for fractions.
To make sure derivatives wrt. to different segmens gets mixed we disregard the derivatives for the properties (density, viscosity) evaluated at the upwind segment.
Note 2:
A factor 2 is added to the velocity head term similar as in the friction term
Note 3:
A sign change is added to the acceleration term for massrates > 0. Is this correct. It seems like the reference simulator does this.
