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muSpectre/src/solver/solver_common.hh
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solver_common.hh
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/**
* @file solver_common.hh
*
* @author Till Junge <till.junge@altermail.ch>
*
* @date 28 Dec 2017
*
* @brief Errors raised by solvers and other common utilities
*
* Copyright © 2017 Till Junge
*
* µSpectre is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation, either version 3, or (at
* your option) any later version.
*
* µSpectre is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with µSpectre; see the file COPYING. If not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifndef SOLVER_COMMON_H
#define SOLVER_COMMON_H
#include "common/common.hh"
#include "common/tensor_algebra.hh"
#include <Eigen/Dense>
#include <stdexcept>
namespace muSpectre {
/**
* emulates scipy.optimize.OptimizeResult
*/
struct OptimizeResult
{
//! Strain ε or Gradient F at solution
Eigen::ArrayXXd grad;
//! Cauchy stress σ or first Piola-Kirchhoff stress P at solution
Eigen::ArrayXXd stress;
//! whether or not the solver exited successfully
bool success;
//! Termination status of the optimizer. Its value depends on the
//! underlying solver. Refer to message for details.
Int status;
//! Description of the cause of the termination.
std::string message;
//! number of iterations
Uint nb_it;
//! number of cell evaluations
Uint nb_fev;
};
/**
* Field type that solvers expect gradients to be expressed in
*/
template <Dim_t Dim>
using Grad_t = Matrices::Tens2_t<Dim>;
/**
* multiple increments can be submitted at once (useful for
* path-dependent materials)
*/
template <Dim_t Dim>
using GradIncrements = std::vector<Grad_t<Dim>,
Eigen::aligned_allocator<Grad_t<Dim>>>;
/* ---------------------------------------------------------------------- */
class SolverError: public std::runtime_error {
using runtime_error::runtime_error;
};
/* ---------------------------------------------------------------------- */
class ConvergenceError: public SolverError {
using SolverError::SolverError;
};
/* ---------------------------------------------------------------------- */
/**
* check whether a strain is symmetric, for the purposes of small
* strain problems
*/
bool check_symmetry(const Eigen::Ref<const Eigen::ArrayXXd>& eps,
Real rel_tol = 1e-8);
} // muSpectre
#endif /* SOLVER_COMMON_H */
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