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65 lines
2.8 KiB
C++
65 lines
2.8 KiB
C++
/*
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Copyright 2015 SINTEF ICT, Applied Mathematics.
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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_NEWTONITERATIONUTILITIES_HEADER_INCLUDED
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#define OPM_NEWTONITERATIONUTILITIES_HEADER_INCLUDED
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#include <opm/autodiff/AutoDiffBlock.hpp>
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#include <vector>
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namespace Opm
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{
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/// Eliminate a variable via Schur complement.
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/// \param[in] eqs set of equations with Jacobians
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/// \param[in] n index of equation/variable to eliminate.
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/// \return new set of equations, one smaller than eqs.
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/// Note: this method requires the eliminated variable to have the same size
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/// as the equation in the corresponding position (that also will be eliminated).
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std::vector< AutoDiffBlock<double> >
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eliminateVariable(const std::vector< AutoDiffBlock<double> >& eqs,
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const int n);
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/// Recover that value of a variable previously eliminated.
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/// \param[in] equation previously eliminated equation.
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/// \param[in] partial_solution solution to the remainder system after elimination.
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/// \param[in] n index of equation/variable that was eliminated.
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/// \return solution to complete system.
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AutoDiffBlock<double>::V recoverVariable(const AutoDiffBlock<double>& equation,
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const AutoDiffBlock<double>::V& partial_solution,
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const int n);
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/// Form an elliptic system of equations.
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/// \param[in] num_phases the number of fluid phases
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/// \param[in] eqs the equations
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/// \param[out] A the resulting full system matrix
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/// \param[out] b the right hand side
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/// This function will deal with the first num_phases
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/// equations in eqs, and return a matrix A for the full
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/// system that has a elliptic upper left corner, if possible.
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void formEllipticSystem(const int num_phases,
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const std::vector< AutoDiffBlock<double> >& eqs,
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Eigen::SparseMatrix<double, Eigen::RowMajor>& A,
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AutoDiffBlock<double>::V& b);
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} // namespace Opm
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#endif // OPM_NEWTONITERATIONUTILITIES_HEADER_INCLUDED
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