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https://github.com/OPM/opm-simulators.git
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376 lines
16 KiB
C++
376 lines
16 KiB
C++
/*
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Copyright 2017 SINTEF Digital, Mathematics and Cybernetics.
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Copyright 2017 Statoil ASA.
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This file is part of the Open Porous Media project (OPM).
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OPM is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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OPM is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with OPM. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef OPM_MULTISEGMENTWELL_HEADER_INCLUDED
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#define OPM_MULTISEGMENTWELL_HEADER_INCLUDED
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#include <opm/autodiff/WellInterface.hpp>
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#include <dune/istl/solvers.hh>
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namespace Opm
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{
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template<typename TypeTag>
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class MultisegmentWell: public WellInterface<TypeTag>
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{
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public:
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typedef WellInterface<TypeTag> Base;
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// TODO: the WellState does not have any information related to segments
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using typename Base::WellState;
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using typename Base::Simulator;
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using typename Base::IntensiveQuantities;
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using typename Base::FluidSystem;
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using typename Base::ModelParameters;
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using typename Base::MaterialLaw;
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// TODO: for now, not considering the polymer, solvent and so on to simplify the development process.
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// TODO: should I begin with the old primary variable or the new fraction based variable systems?
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// Let us begin with the new one
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// TODO: we need to have order for the primary variables and also the order for the well equations.
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// sometimes, they are similar, while sometimes, they can have very different forms.
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enum WellVariablePositions {
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GTotal = 0,
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WFrac = 1,
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GFrac = 2,
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SPres = 3
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};
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/// the number of well equations // TODO: it should have a more general strategy for it
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static const int numWellEq = 4;
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using typename Base::Scalar;
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using typename Base::ConvergenceReport;
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/// the number of reservior equations
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using Base::numEq;
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/// the matrix and vector types for the reservoir
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using typename Base::Mat;
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using typename Base::BVector;
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using typename Base::Eval;
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// sparsity pattern for the matrices
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// [A C^T [x = [ res
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// B D ] x_well] res_well]
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// the vector type for the res_well and x_well
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typedef Dune::FieldVector<Scalar, numWellEq> VectorBlockWellType;
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typedef Dune::BlockVector<VectorBlockWellType> BVectorWell;
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// the matrix type for the diagonal matrix D
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typedef Dune::FieldMatrix<Scalar, numWellEq, numWellEq > DiagMatrixBlockWellType;
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typedef Dune::BCRSMatrix <DiagMatrixBlockWellType> DiagMatWell;
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// the matrix type for the non-diagonal matrix B and C^T
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typedef Dune::FieldMatrix<Scalar, numWellEq, numEq> OffDiagMatrixBlockWellType;
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typedef Dune::BCRSMatrix<OffDiagMatrixBlockWellType> OffDiagMatWell;
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// TODO: for more efficient implementation, we should have EvalReservoir, EvalWell, and EvalRerservoirAndWell
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// EvalR (Eval), EvalW, EvalRW
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// TODO: for now, we only use one type to save some implementation efforts, while improve later.
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typedef DenseAd::Evaluation<double, /*size=*/numEq + numWellEq> EvalWell;
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MultisegmentWell(const Well* well, const int time_step, const Wells* wells);
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virtual void init(const PhaseUsage* phase_usage_arg,
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const std::vector<bool>* active_arg,
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const std::vector<double>& depth_arg,
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const double gravity_arg,
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const int num_cells);
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virtual void initPrimaryVariablesEvaluation() const;
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virtual void assembleWellEq(Simulator& ebosSimulator,
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const double dt,
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WellState& well_state,
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bool only_wells);
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/// updating the well state based the control mode specified with current
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// TODO: later will check wheter we need current
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virtual void updateWellStateWithTarget(const int current,
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WellState& well_state) const;
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/// check whether the well equations get converged for this well
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virtual ConvergenceReport getWellConvergence(Simulator& ebosSimulator,
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const std::vector<double>& B_avg,
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const ModelParameters& param) const;
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/// Ax = Ax - C D^-1 B x
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virtual void apply(const BVector& x, BVector& Ax) const;
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/// r = r - C D^-1 Rw
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virtual void apply(BVector& r) const;
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/// using the solution x to recover the solution xw for wells and applying
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/// xw to update Well State
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virtual void recoverWellSolutionAndUpdateWellState(const BVector& x, const ModelParameters& param,
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WellState& well_state) const;
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/// computing the well potentials for group control
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virtual void computeWellPotentials(const Simulator& ebosSimulator,
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const WellState& well_state,
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std::vector<double>& well_potentials);
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virtual void updatePrimaryVariables(const WellState& well_state) const;
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virtual void solveEqAndUpdateWellState(const ModelParameters& param,
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WellState& well_state); // const?
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virtual void calculateExplicitQuantities(const Simulator& ebosSimulator,
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const WellState& well_state); // should be const?
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/// number of segments for this well
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/// int number_of_segments_;
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int numberOfSegments() const;
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int numberOfPerforations() const;
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protected:
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int number_segments_;
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// components of the pressure drop to be included
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WellSegment::CompPressureDropEnum compPressureDrop() const;
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// multi-phase flow model
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WellSegment::MultiPhaseModelEnum multiphaseModel() const;
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// get the SegmentSet from the well_ecl_
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const SegmentSet& segmentSet() const;
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// protected member variables from the Base class
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using Base::well_ecl_;
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using Base::number_of_perforations_; // TODO: can use well_ecl_?
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using Base::current_step_;
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using Base::index_of_well_;
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using Base::number_of_phases_;
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using Base::well_cells_; // TODO: are the perforation orders same with StandardWell or Wells?
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using Base::well_index_;
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using Base::well_type_;
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using Base::first_perf_;
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using Base::saturation_table_number_;
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using Base::well_efficiency_factor_;
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using Base::gravity_;
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using Base::well_controls_;
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// protected functions from the Base class
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using Base::active;
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using Base::phaseUsage;
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using Base::name;
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using Base::numComponents;
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using Base::flowToEbosPvIdx;
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using Base::flowPhaseToEbosPhaseIdx;
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using Base::flowPhaseToEbosCompIdx;
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using Base::getAllowCrossFlow;
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// TODO: trying to use the information from the Well opm-parser as much
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// as possible, it will possibly be re-implemented later for efficiency reason.
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// indices of the gird blocks that segments locate at.
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// TODO: the grid cell related to a segment should be calculated based on the location
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// of the segment node.
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// As the current temporary solution, the grid cell related to a segment determined by the
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// first perforation cell related to the segment.
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// when no perforation is related to the segment, use it outlet segment's cell.
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// TODO: it can be a source of error
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std::vector<int> segment_cell_;
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// the completions that is related to each segment
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// the completions's ids are their location in the vector well_index_, well_cell_
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// This is also assuming the order of the completions in Well is the same with
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// the order of the completions in wells.
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// it is for convinience reason. we can just calcuate the inforation for segment once then using it for all the perofrations
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// belonging to this segment
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std::vector<std::vector<int> > segment_perforations_;
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// the inlet segments for each segment. It is for convinience and efficiency reason
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// the original segment structure is defined as a gathering tree structure based on outlet_segment
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// the reason that we can not use the old way of WellOps, which is based on the Eigen matrix and vector.
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// TODO: can we use DUNE FieldMatrix and FieldVector.
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std::vector<std::vector<int> > segment_inlets_;
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// Things are easy to get from SegmentSet
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// segment_volume_, segment_cross_area_, segment_length_(total length), segment_depth_
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// segment_internal_diameter_, segment_roughness_
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// outlet_segment_., in the outlet_segment, we store the ID of the segment, we will need to use numberToLocation to get
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// their location in the segmentSet
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// segment number is an ID of the segment, it is specified in the deck
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// get the loation of the segment with a segment number in the segmentSet
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int numberToLocation(const int segment_number) const;
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// TODO, the following should go to a class for computing purpose
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// two off-diagonal matrices
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mutable OffDiagMatWell duneB_;
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mutable OffDiagMatWell duneC_;
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// diagonal matrix for the well
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// TODO: if we decided not to invert it, we better change the name of it
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mutable DiagMatWell duneD_;
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// several vector used in the matrix calculation
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mutable BVectorWell Bx_;
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mutable BVector scaleAddRes_;
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// residuals of the well equations
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mutable BVectorWell resWell_;
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// the values for the primary varibles
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// based on different solutioin strategies, the wells can have different primary variables
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// TODO: should we introduce a data structure for segment to simplify this?
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// or std::vector<std::vector<double> >
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mutable std::vector<std::array<double, numWellEq> > primary_variables_;
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// the Evaluation for the well primary variables, which contain derivativles and are used in AD calculation
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mutable std::vector<std::array<EvalWell, numWellEq> > primary_variables_evaluation_;
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// pressure correction due to the different depth of the perforation and
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// center depth of the grid block
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std::vector<double> perforation_cell_pressure_diffs_;
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// depth difference between the segment and the peforation
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// or in another way, the depth difference between the perforation and
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// the segment the perforation belongs to
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std::vector<double> segment_perforation_depth_diffs_;
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// the intial component compistion of segments
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std::vector<std::vector<double> > segment_comp_initial_;
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// the densities of segment fluids
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// TODO: if it turned out it is only used to calculate the pressure difference,
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// we should not have this member variable
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std::vector<EvalWell> segment_densities_;
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std::vector<double> segment_depth_diffs_;
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void initMatrixAndVectors(const int num_cells) const;
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// protected functions
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// EvalWell getBhp(); this one should be something similar to getSegmentPressure();
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// EvalWell getQs(); this one should be something similar to getSegmentRates()
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// EValWell wellVolumeFractionScaled, wellVolumeFraction, wellSurfaceVolumeFraction ... these should have different names, and probably will be needed.
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// bool crossFlowAllowed(const Simulator& ebosSimulator) const; probably will be needed
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// xw = inv(D)*(rw - C*x)
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void recoverSolutionWell(const BVector& x, BVectorWell& xw) const;
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// updating the well_state based on well solution dwells
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void updateWellState(const BVectorWell& dwells,
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const BlackoilModelParameters& param,
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WellState& well_state) const;
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// computing the accumulation term for later use in well mass equations
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void computeInitialComposition();
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// compute the pressure difference between the perforation and cell center
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void computePerfCellPressDiffs(const Simulator& ebosSimulator);
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// fraction value of the primary variables
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// should we just use member variables to store them instead of calculating them again and again
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EvalWell volumeFraction(const int seg, const int comp_idx) const;
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// F_p / g_p, the basic usage of this value is because Q_p = G_t * F_p / G_p
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EvalWell volumeFractionScaled(const int seg, const int comp_idx) const;
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// basically Q_p / \sigma_p Q_p
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EvalWell surfaceVolumeFraction(const int seg, const int comp_idx) const;
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void computePerfRate(const IntensiveQuantities& int_quants,
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const std::vector<EvalWell>& mob_perfcells,
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const int seg,
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const double well_index,
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const EvalWell& segment_pressure,
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const bool& allow_cf,
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std::vector<EvalWell>& cq_s) const;
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// convert a Eval from reservoir to contain the derivative related to wells
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EvalWell extendEval(const Eval& in) const;
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// compute the densities of the mixture in the segments
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// TODO: probably other fluid properties also.
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// They will be treated implicitly, so they need to be of Evaluation type
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void computeSegmentFluidProperties(const Simulator& ebosSimulator);
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EvalWell getSegmentPressure(const int seg) const;
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EvalWell getSegmentRate(const int seg, const int comp_idx) const;
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EvalWell getSegmentGTotal(const int seg) const;
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// get the mobility for specific perforation
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void getMobility(const Simulator& ebosSimulator,
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const int perf,
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std::vector<EvalWell>& mob) const;
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void assembleControlEq() const;
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void assemblePressureEq(const int seg) const;
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// hytrostatic pressure loss
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EvalWell getHydroPressureLoss(const int seg) const;
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// handling the overshooting and undershooting of the fractions
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void processFractions(const int seg) const;
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void updateWellStateFromPrimaryVariables(WellState& well_state) const;
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};
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// obtain y = D^-1 * x
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template<typename MatrixType, typename VectorType>
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VectorType
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invDX(MatrixType D, VectorType x)
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{
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// TODO: checking the problem related to use reference parameter
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// TODO: store some of the following information to avoid to call it again and again for
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// efficiency improvement.
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// Bassically, only the solve / apply step is different.
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VectorType y(x.size());
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y = 0.;
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Dune::MatrixAdapter<MatrixType, VectorType, VectorType> linearOperator(D);
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// Sequential incomplete LU decomposition as the preconditioner
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Dune::SeqILU0<MatrixType, VectorType, VectorType> preconditioner(D, 1.0);
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// Preconditioned BICGSTAB solver
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Dune::BiCGSTABSolver<VectorType> linsolver(linearOperator,
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preconditioner,
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1.e-6, // desired residual reduction factor
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50, // maximum number of iterations
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0); // verbosity of the solver
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// Object storing some statistics about the solving process
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Dune::InverseOperatorResult statistics ;
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// Solve
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linsolver.apply(y, x, statistics );
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return y;
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}
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}
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#include "MultisegmentWell_impl.hpp"
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#endif // OPM_MULTISEGMENTWELL_HEADER_INCLUDED
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