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120 lines
5.1 KiB
C++
120 lines
5.1 KiB
C++
/*
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Copyright 2012 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_LINEARSOLVERISTL_HEADER_INCLUDED
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#define OPM_LINEARSOLVERISTL_HEADER_INCLUDED
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#include <opm/core/linalg/LinearSolverInterface.hpp>
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#include <opm/core/utility/parameters/ParameterGroup.hpp>
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#include <string>
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#include <boost/any.hpp>
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namespace Opm
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{
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/// Concrete class encapsulating some dune-istl linear solvers.
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class LinearSolverIstl : public LinearSolverInterface
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{
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public:
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/// Default constructor.
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/// All parameters controlling the solver are defaulted:
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/// linsolver_residual_tolerance 1e-8
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/// linsolver_verbosity 0
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/// linsolver_type 1 ( = CG_AMG), alternatives are:
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/// CG_ILU0 = 0, CG_AMG = 1, BiCGStab_ILU0 = 2
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/// FastAMG=3, KAMG=4 };
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/// linsolver_save_system false
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/// linsolver_save_filename <empty string>
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/// linsolver_max_iterations 0 (unlimited=5000)
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/// linsolver_residual_tolerance 1e-8
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/// linsolver_smooth_steps 2
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/// linsolver_prolongate_factor 1.6
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/// linsolver_verbosity 0
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LinearSolverIstl();
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/// Construct from parameters
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/// Accepted parameters are, with defaults, listed in the
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/// default constructor.
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LinearSolverIstl(const parameter::ParameterGroup& param);
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/// Destructor.
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virtual ~LinearSolverIstl();
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using LinearSolverInterface::solve;
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/// Solve a linear system, with a matrix given in compressed sparse row format.
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/// \param[in] size # of rows in matrix
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/// \param[in] nonzeros # of nonzeros elements in matrix
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/// \param[in] ia array of length (size + 1) containing start and end indices for each row
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/// \param[in] ja array of length nonzeros containing column numbers for the nonzero elements
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/// \param[in] sa array of length nonzeros containing the values of the nonzero elements
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/// \param[in] rhs array of length size containing the right hand side
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/// \param[inout] solution array of length size to which the solution will be written, may also be used
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/// as initial guess by iterative solvers.
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virtual LinearSolverReport solve(const int size,
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const int nonzeros,
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const int* ia,
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const int* ja,
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const double* sa,
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const double* rhs,
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double* solution,
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const boost::any& comm=boost::any()) const;
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/// Set tolerance for the residual in dune istl linear solver.
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/// \param[in] tol tolerance value
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virtual void setTolerance(const double tol);
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/// Get tolerance ofthe linear solver.
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/// \param[out] tolerance value
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virtual double getTolerance() const;
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private:
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/// \brief Solve the linear system using ISTL
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/// \param[in] opA The linear operator of the system to solve.
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/// \param[out] solution C array for storing the solution vector.
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/// \param[in] rhs C array containing the right hand side.
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/// \param[in] sp The scalar product to use.
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/// \param[in] comm The information about the parallel domain decomposition.
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/// \param[in] maxit The maximum number of iterations allowed.
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template<class O, class S, class C>
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LinearSolverReport solveSystem(O& opA, double* solution, const double *rhs,
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S& sp, const C& comm, int maxit) const;
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double linsolver_residual_tolerance_;
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int linsolver_verbosity_;
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enum LinsolverType { CG_ILU0 = 0, CG_AMG = 1, BiCGStab_ILU0 = 2, FastAMG=3, KAMG=4 };
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LinsolverType linsolver_type_;
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bool linsolver_save_system_;
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std::string linsolver_save_filename_;
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int linsolver_max_iterations_;
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/** \brief The number smoothing steps to apply in AMG. */
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int linsolver_smooth_steps_;
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/** \brief The factor to scale the coarse grid correction with. */
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double linsolver_prolongate_factor_;
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};
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} // namespace Opm
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#endif // OPM_LINEARSOLVERISTL_HEADER_INCLUDED
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