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rAKA akantu
model_solver.cc
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/**
* @file model_solver.cc
*
* @author Nicolas Richart <nicolas.richart@epfl.ch>
*
* @date Wed Aug 12 13:31:56 2015
*
* @brief Implementation of ModelSolver
*
* @section LICENSE
*
* Copyright (©) 2010-2011 EPFL (Ecole Polytechnique Fédérale de Lausanne)
* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
*
* Akantu is free software: you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License as published by the Free
* Software Foundation, either version 3 of the License, or (at your option) any
* later version.
*
* Akantu 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 Lesser General Public License for more
* details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with Akantu. If not, see <http://www.gnu.org/licenses/>.
*
*/
/* -------------------------------------------------------------------------- */
#include "model_solver.hh"
#include "dof_manager.hh"
#include "non_linear_solver.hh"
#include "time_step_solver.hh"
#include "mesh.hh"
#if defined(AKANTU_USE_MPI)
#include "mpi_type_wrapper.hh"
#endif
#include "dof_manager_default.hh"
#if defined(AKANTU_USE_PETSC)
#include "dof_manager_petsc.hh"
#endif
/* -------------------------------------------------------------------------- */
__BEGIN_AKANTU__
/* -------------------------------------------------------------------------- */
ModelSolver
::
ModelSolver
(
Mesh
&
mesh
,
const
ID
&
id
,
UInt
memory_id
)
:
Parsable
(
_st_model_solver
,
id
),
SolverCallback
(),
parent_id
(
id
),
parent_memory_id
(
memory_id
),
mesh
(
mesh
),
dof_manager
(
NULL
),
default_solver_id
(
""
)
{}
/* -------------------------------------------------------------------------- */
ModelSolver
::~
ModelSolver
()
{
delete
this
->
dof_manager
;
}
/* -------------------------------------------------------------------------- */
void
ModelSolver
::
initDOFManager
()
{
std
::
pair
<
Parser
::
const_section_iterator
,
Parser
::
const_section_iterator
>
sub_sect
=
getStaticParser
().
getSubSections
(
_st_model_solver
);
// default without external solver activated at compilation same as mumps that
// is the historical solver but with only the lumped solver
ID
solver_type
=
"explicit"
;
#if defined(AKANTU_USE_MUMPS)
solver_type
=
"mumps"
;
#elif defined(AKANTU_USE_PETSC)
solver_type
=
"petsc"
;
#endif
const
ParserSection
*
section
=
NULL
;
Parser
::
const_section_iterator
it
;
for
(
it
=
sub_sect
.
first
;
it
!=
sub_sect
.
second
&&
section
==
NULL
;
++
it
)
{
if
(
it
->
getName
()
==
this
->
parent_id
)
{
section
=
&
(
*
it
);
solver_type
=
section
->
getOption
(
solver_type
);
}
}
if
(
section
)
{
this
->
initDOFManager
(
*
section
,
solver_type
);
}
else
{
this
->
initDOFManager
(
solver_type
);
}
}
/* -------------------------------------------------------------------------- */
void
ModelSolver
::
initDOFManager
(
const
ID
&
solver_type
)
{
if
(
solver_type
==
"explicit"
)
{
ID
id
=
this
->
parent_id
+
":dof_manager_default"
;
this
->
dof_manager
=
new
DOFManagerDefault
(
mesh
,
id
,
this
->
parent_memory_id
);
}
else
if
(
solver_type
==
"petsc"
)
{
#if defined(AKANTU_USE_PETSC)
ID
id
=
this
->
parent_id
+
":dof_manager_petsc"
;
this
->
dof_manager
=
new
DOFManagerPETSc
(
mesh
,
id
,
this
->
parent_memory_id
);
#else
AKANTU_EXCEPTION
(
"To use PETSc you have to activate it in the compilations options"
);
#endif
}
else
if
(
solver_type
==
"mumps"
)
{
#if defined(AKANTU_USE_MUMPS)
ID
id
=
this
->
parent_id
+
":dof_manager_default"
;
this
->
dof_manager
=
new
DOFManagerDefault
(
mesh
,
id
,
this
->
parent_memory_id
);
#else
AKANTU_EXCEPTION
(
"To use MUMPS you have to activate it in the compilations options"
);
#endif
}
else
{
AKANTU_EXCEPTION
(
"To use the solver "
<<
solver_type
<<
" you will have to code it. This is an unknown solver type."
);
}
this
->
setDOFManager
(
*
this
->
dof_manager
);
}
/* -------------------------------------------------------------------------- */
template
<
typename
T
>
static
T
getOptionToType
(
const
std
::
string
&
opt_str
)
{
std
::
stringstream
sstr
(
opt_str
);
T
opt
;
sstr
>>
opt
;
return
opt
;
}
/* -------------------------------------------------------------------------- */
void
ModelSolver
::
initDOFManager
(
const
ParserSection
&
section
,
const
ID
&
solver_type
)
{
this
->
initDOFManager
(
solver_type
);
std
::
pair
<
Parser
::
const_section_iterator
,
Parser
::
const_section_iterator
>
sub_sect
=
section
.
getSubSections
(
_st_time_step_solver
);
Parser
::
const_section_iterator
it
;
for
(
it
=
sub_sect
.
first
;
it
!=
sub_sect
.
second
;
++
it
)
{
ID
solver_id
=
it
->
getName
();
std
::
string
str
=
it
->
getOption
();
TimeStepSolverType
tss_type
=
it
->
getParameter
(
"type"
,
this
->
getDefaultSolverType
());
ModelSolverOptions
tss_options
=
this
->
getDefaultSolverOptions
(
tss_type
);
std
::
pair
<
Parser
::
const_section_iterator
,
Parser
::
const_section_iterator
>
sub_solvers_sect
=
it
->
getSubSections
(
_st_non_linear_solver
);
Parser
::
const_section_iterator
sub_it
;
UInt
nb_non_linear_solver_section
=
it
->
getNbSubSections
(
_st_non_linear_solver
);
NonLinearSolverType
nls_type
=
tss_options
.
non_linear_solver_type
;
if
(
nb_non_linear_solver_section
==
1
)
{
const
ParserSection
&
nls_section
=
*
(
sub_solvers_sect
.
first
);
nls_type
=
getOptionToType
<
NonLinearSolverType
>
(
nls_section
.
getName
());
}
else
if
(
nb_non_linear_solver_section
>
0
)
{
AKANTU_EXCEPTION
(
"More than one non linear solver are provided for the "
"time step solver "
<<
solver_id
);
}
this
->
getNewSolver
(
solver_id
,
tss_type
,
nls_type
);
if
(
nb_non_linear_solver_section
==
1
)
{
const
ParserSection
&
nls_section
=
*
(
sub_solvers_sect
.
first
);
this
->
dof_manager
->
getNonLinearSolver
(
solver_id
).
parseSection
(
nls_section
);
}
std
::
pair
<
Parser
::
const_section_iterator
,
Parser
::
const_section_iterator
>
sub_integrator_sect
=
it
->
getSubSections
(
_st_integration_scheme
);
for
(
sub_it
=
sub_integrator_sect
.
first
;
sub_it
!=
sub_integrator_sect
.
second
;
++
sub_it
)
{
const
ParserSection
&
is_section
=
*
sub_it
;
const
ID
&
dof_id
=
is_section
.
getName
();
IntegrationSchemeType
it_type
=
is_section
.
getParameter
(
"type"
,
tss_options
.
integration_scheme_type
[
dof_id
]);
IntegrationScheme
::
SolutionType
s_type
=
is_section
.
getParameter
(
"solution_type"
,
tss_options
.
solution_type
[
dof_id
]);
this
->
setIntegrationScheme
(
solver_id
,
dof_id
,
it_type
,
s_type
);
}
std
::
map
<
ID
,
IntegrationSchemeType
>::
const_iterator
it
=
tss_options
.
integration_scheme_type
.
begin
();
std
::
map
<
ID
,
IntegrationSchemeType
>::
const_iterator
end
=
tss_options
.
integration_scheme_type
.
end
();
for
(;
it
!=
end
;
++
it
)
{
if
(
!
this
->
hasIntegrationScheme
(
solver_id
,
it
->
first
))
{
this
->
setIntegrationScheme
(
solver_id
,
it
->
first
,
it
->
second
,
tss_options
.
solution_type
[
it
->
first
]);
}
}
}
if
(
section
.
hasParameter
(
"default_solver"
))
{
ID
default_solver
=
section
.
getParameter
(
"default_solver"
);
this
->
setDefaultSolver
(
default_solver
);
}
}
/* -------------------------------------------------------------------------- */
TimeStepSolver
&
ModelSolver
::
getSolver
(
const
ID
&
solver_id
)
{
ID
tmp_solver_id
=
solver_id
;
if
(
tmp_solver_id
==
""
)
tmp_solver_id
=
this
->
default_solver_id
;
TimeStepSolver
&
tss
=
this
->
dof_manager
->
getTimeStepSolver
(
tmp_solver_id
);
return
tss
;
}
/* -------------------------------------------------------------------------- */
const
TimeStepSolver
&
ModelSolver
::
getSolver
(
const
ID
&
solver_id
)
const
{
ID
tmp_solver_id
=
solver_id
;
if
(
solver_id
==
""
)
tmp_solver_id
=
this
->
default_solver_id
;
const
TimeStepSolver
&
tss
=
this
->
dof_manager
->
getTimeStepSolver
(
tmp_solver_id
);
return
tss
;
}
/* -------------------------------------------------------------------------- */
TimeStepSolver
&
ModelSolver
::
getTimeStepSolver
(
const
ID
&
solver_id
)
{
return
this
->
getSolver
(
solver_id
);
}
/* -------------------------------------------------------------------------- */
const
TimeStepSolver
&
ModelSolver
::
getTimeStepSolver
(
const
ID
&
solver_id
)
const
{
return
this
->
getSolver
(
solver_id
);
}
/* -------------------------------------------------------------------------- */
NonLinearSolver
&
ModelSolver
::
getNonLinearSolver
(
const
ID
&
solver_id
)
{
return
this
->
getSolver
(
solver_id
).
getNonLinearSolver
();
}
/* -------------------------------------------------------------------------- */
const
NonLinearSolver
&
ModelSolver
::
getNonLinearSolver
(
const
ID
&
solver_id
)
const
{
return
this
->
getSolver
(
solver_id
).
getNonLinearSolver
();
}
/* -------------------------------------------------------------------------- */
bool
ModelSolver
::
hasSolver
(
const
ID
&
solver_id
)
const
{
ID
tmp_solver_id
=
solver_id
;
if
(
solver_id
==
""
)
tmp_solver_id
=
this
->
default_solver_id
;
return
this
->
dof_manager
->
hasTimeStepSolver
(
tmp_solver_id
);
}
/* -------------------------------------------------------------------------- */
void
ModelSolver
::
setDefaultSolver
(
const
ID
&
solver_id
)
{
AKANTU_DEBUG_ASSERT
(
this
->
hasSolver
(
solver_id
),
"Cannot set the default solver to a solver that does not exists"
);
this
->
default_solver_id
=
solver_id
;
}
/* -------------------------------------------------------------------------- */
void
ModelSolver
::
solveStep
(
const
ID
&
solver_id
)
{
AKANTU_DEBUG_IN
();
TimeStepSolver
&
tss
=
this
->
getSolver
(
solver_id
);
// make one non linear solve
tss
.
solveStep
(
*
this
);
AKANTU_DEBUG_OUT
();
}
/* -------------------------------------------------------------------------- */
void
ModelSolver
::
getNewSolver
(
const
ID
&
solver_id
,
TimeStepSolverType
time_step_solver_type
,
NonLinearSolverType
non_linear_solver_type
)
{
if
(
this
->
default_solver_id
==
""
)
{
this
->
default_solver_id
=
solver_id
;
}
if
(
non_linear_solver_type
==
_nls_auto
)
{
switch
(
time_step_solver_type
)
{
case
_tsst_dynamic:
case
_tsst_static:
non_linear_solver_type
=
_nls_newton_raphson
;
break
;
case
_tsst_dynamic_lumped:
non_linear_solver_type
=
_nls_lumped
;
break
;
}
}
this
->
initSolver
(
time_step_solver_type
,
non_linear_solver_type
);
NonLinearSolver
&
nls
=
this
->
dof_manager
->
getNewNonLinearSolver
(
solver_id
,
non_linear_solver_type
);
this
->
dof_manager
->
getNewTimeStepSolver
(
solver_id
,
time_step_solver_type
,
nls
);
}
/* -------------------------------------------------------------------------- */
Real
ModelSolver
::
getTimeStep
(
const
ID
&
solver_id
)
const
{
const
TimeStepSolver
&
tss
=
this
->
getSolver
(
solver_id
);
return
tss
.
getTimeStep
();
}
/* -------------------------------------------------------------------------- */
void
ModelSolver
::
setTimeStep
(
Real
time_step
,
const
ID
&
solver_id
)
{
TimeStepSolver
&
tss
=
this
->
getSolver
(
solver_id
);
return
tss
.
setTimeStep
(
time_step
);
}
/* -------------------------------------------------------------------------- */
void
ModelSolver
::
setIntegrationScheme
(
const
ID
&
solver_id
,
const
ID
&
dof_id
,
const
IntegrationSchemeType
&
integration_scheme_type
,
IntegrationScheme
::
SolutionType
solution_type
)
{
TimeStepSolver
&
tss
=
this
->
dof_manager
->
getTimeStepSolver
(
solver_id
);
tss
.
setIntegrationScheme
(
dof_id
,
integration_scheme_type
,
solution_type
);
}
/* -------------------------------------------------------------------------- */
bool
ModelSolver
::
hasDefaultSolver
()
const
{
return
(
this
->
default_solver_id
!=
""
);
}
/* -------------------------------------------------------------------------- */
bool
ModelSolver
::
hasIntegrationScheme
(
const
ID
&
solver_id
,
const
ID
&
dof_id
)
const
{
TimeStepSolver
&
tss
=
this
->
dof_manager
->
getTimeStepSolver
(
solver_id
);
return
tss
.
hasIntegrationScheme
(
dof_id
);
}
/* -------------------------------------------------------------------------- */
void
ModelSolver
::
predictor
()
{}
/* -------------------------------------------------------------------------- */
void
ModelSolver
::
corrector
()
{}
/* -------------------------------------------------------------------------- */
TimeStepSolverType
ModelSolver
::
getDefaultSolverType
()
const
{
return
_tsst_dynamic_lumped
;
}
/* -------------------------------------------------------------------------- */
ModelSolverOptions
ModelSolver
::
getDefaultSolverOptions
(
__attribute__
((
unused
))
const
TimeStepSolverType
&
type
)
const
{
ModelSolverOptions
options
;
options
.
non_linear_solver_type
=
_nls_auto
;
return
options
;
}
/* -------------------------------------------------------------------------- */
// void ModelSolver::setIntegrationScheme(
// const ID & solver_id, const ID & dof_id,
// const IntegrationSchemeType & integration_scheme_type) {}
/* -------------------------------------------------------------------------- */
// /* --------------------------------------------------------------------------
// */
// template <NewmarkBeta::IntegrationSchemeCorrectorType type>
// void SolidMechanicsModel::solve(Array<Real> &increment, Real block_val,
// bool need_factorize, bool
// has_profile_changed) {
// if(has_profile_changed) {
// this->initJacobianMatrix();
// need_factorize = true;
// }
// updateResidualInternal(); //doesn't do anything for static
// if(need_factorize) {
// Real c = 0.,d = 0.,e = 0.;
// if(method == _static) {
// AKANTU_DEBUG_INFO("Solving K inc = r");
// e = 1.;
// } else {
// AKANTU_DEBUG_INFO("Solving (c M + d C + e K) inc = r");
// NewmarkBeta * nmb_int = dynamic_cast<NewmarkBeta *>(integrator);
// c = nmb_int->getAccelerationCoefficient<type>(time_step);
// d = nmb_int->getVelocityCoefficient<type>(time_step);
// e = nmb_int->getDisplacementCoefficient<type>(time_step);
// }
// jacobian_matrix->clear();
// // J = c M + d C + e K
// if(stiffness_matrix)
// jacobian_matrix->add(*stiffness_matrix, e);
// if(mass_matrix)
// jacobian_matrix->add(*mass_matrix, c);
// #if !defined(AKANTU_NDEBUG)
// if(mass_matrix && AKANTU_DEBUG_TEST(dblDump))
// mass_matrix->saveMatrix("M.mtx");
// #endif
// if(velocity_damping_matrix)
// jacobian_matrix->add(*velocity_damping_matrix, d);
// jacobian_matrix->applyBoundary(*blocked_dofs, block_val);
// #if !defined(AKANTU_NDEBUG)
// if(AKANTU_DEBUG_TEST(dblDump))
// jacobian_matrix->saveMatrix("J.mtx");
// #endif
// solver->factorize();
// }
// // if (rhs.getSize() != 0)
// // solver->setRHS(rhs);
// // else
// solver->setOperators();
// solver->setRHS(*residual);
// // solve @f[ J \delta w = r @f]
// solver->solve(increment);
// UInt nb_nodes = displacement-> getSize();
// UInt nb_degree_of_freedom = displacement->getNbComponent() * nb_nodes;
// bool * blocked_dofs_val = blocked_dofs->storage();
// Real * increment_val = increment.storage();
// for (UInt j = 0; j < nb_degree_of_freedom;
// ++j,++increment_val, ++blocked_dofs_val) {
// if ((*blocked_dofs_val))
// *increment_val = 0.0;
// }
// }
// /* --------------------------------------------------------------------------
// */
// template<SolveConvergenceMethod cmethod, SolveConvergenceCriteria criteria>
// bool SolidMechanicsModel::solveStatic(Real tolerance, UInt max_iteration,
// bool do_not_factorize) {
// AKANTU_DEBUG_INFO("Solving Ku = f");
// AKANTU_DEBUG_ASSERT(stiffness_matrix != NULL,
// "You should first initialize the implicit solver and
// assemble the stiffness matrix by calling
// initImplicit");
// AnalysisMethod analysis_method=method;
// Real error = 0.;
// method=_static;
// bool converged = this->template solveStep<cmethod, criteria>(tolerance,
// error, max_iteration, do_not_factorize);
// method=analysis_method;
// return converged;
// }
// /* --------------------------------------------------------------------------
// */
// template<SolveConvergenceMethod cmethod, SolveConvergenceCriteria criteria>
// bool SolidMechanicsModel::solveStep(Real tolerance,
// UInt max_iteration) {
// Real error = 0.;
// return this->template solveStep<cmethod,criteria>(tolerance,
// error,
// max_iteration);
// }
// /* --------------------------------------------------------------------------
// */
// template<SolveConvergenceMethod cmethod, SolveConvergenceCriteria criteria>
// bool SolidMechanicsModel::solveStep(Real tolerance, Real & error, UInt
// max_iteration,
// bool do_not_factorize) {
// EventManager::sendEvent(SolidMechanicsModelEvent::BeforeSolveStepEvent(method));
// this->implicitPred();
// this->updateResidual();
// AKANTU_DEBUG_ASSERT(stiffness_matrix != NULL,
// "You should first initialize the implicit solver and
// assemble the stiffness matrix");
// bool need_factorize = !do_not_factorize;
// if (method==_implicit_dynamic) {
// AKANTU_DEBUG_ASSERT(mass_matrix != NULL,
// "You should first initialize the implicit solver and
// assemble the mass matrix");
// }
// switch (cmethod) {
// case _scm_newton_raphson_tangent:
// case _scm_newton_raphson_tangent_not_computed:
// break;
// case _scm_newton_raphson_tangent_modified:
// this->assembleStiffnessMatrix();
// break;
// default:
// AKANTU_DEBUG_ERROR("The resolution method " << cmethod << " has not been
// implemented!");
// }
// this->n_iter = 0;
// bool converged = false;
// error = 0.;
// if(criteria == _scc_residual) {
// converged = this->testConvergence<criteria> (tolerance, error);
// if(converged) return converged;
// }
// do {
// if (cmethod == _scm_newton_raphson_tangent)
// this->assembleStiffnessMatrix();
// solve<NewmarkBeta::_displacement_corrector> (*increment, 1.,
// need_factorize);
// this->implicitCorr();
// if(criteria == _scc_residual) this->updateResidual();
// converged = this->testConvergence<criteria> (tolerance, error);
// if(criteria == _scc_increment && !converged) this->updateResidual();
// //this->dump();
// this->n_iter++;
// AKANTU_DEBUG_INFO("[" << criteria << "] Convergence iteration "
// << std::setw(std::log10(max_iteration)) << this->n_iter
// << ": error " << error << (converged ? " < " : " > ")
// << tolerance);
// switch (cmethod) {
// case _scm_newton_raphson_tangent:
// need_factorize = true;
// break;
// case _scm_newton_raphson_tangent_not_computed:
// case _scm_newton_raphson_tangent_modified:
// need_factorize = false;
// break;
// default:
// AKANTU_DEBUG_ERROR("The resolution method " << cmethod << " has not
// been implemented!");
// }
// } while (!converged && this->n_iter < max_iteration);
// // this makes sure that you have correct strains and stresses after the
// solveStep function (e.g., for dumping)
// if(criteria == _scc_increment) this->updateResidual();
// if (converged) {
// EventManager::sendEvent(SolidMechanicsModelEvent::AfterSolveStepEvent(method));
// } else if(this->n_iter == max_iteration) {
// AKANTU_DEBUG_WARNING("[" << criteria << "] Convergence not reached after
// "
// << std::setw(std::log10(max_iteration)) <<
// this->n_iter <<
// " iteration" << (this->n_iter == 1 ? "" : "s") <<
// "!" << std::endl);
// }
// return converged;
// }
// void SolidMechanicsModel::updateResidualInternal() {
// AKANTU_DEBUG_IN();
// AKANTU_DEBUG_INFO("Update the residual");
// // f = f_ext - f_int - Ma - Cv = r - Ma - Cv;
// if(method != _static) {
// // f -= Ma
// if(mass_matrix) {
// // if full mass_matrix
// Array<Real> * Ma = new Array<Real>(*acceleration, true, "Ma");
// *Ma *= *mass_matrix;
// /// \todo check unit conversion for implicit dynamics
// // *Ma /= f_m2a
// *residual -= *Ma;
// delete Ma;
// } else if (mass) {
// // else lumped mass
// UInt nb_nodes = acceleration->getSize();
// UInt nb_degree_of_freedom = acceleration->getNbComponent();
// Real * mass_val = mass->storage();
// Real * accel_val = acceleration->storage();
// Real * res_val = residual->storage();
// bool * blocked_dofs_val = blocked_dofs->storage();
// for (UInt n = 0; n < nb_nodes * nb_degree_of_freedom; ++n) {
// if(!(*blocked_dofs_val)) {
// *res_val -= *accel_val * *mass_val /f_m2a;
// }
// blocked_dofs_val++;
// res_val++;
// mass_val++;
// accel_val++;
// }
// } else {
// AKANTU_DEBUG_ERROR("No function called to assemble the mass matrix.");
// }
// // f -= Cv
// if(velocity_damping_matrix) {
// Array<Real> * Cv = new Array<Real>(*velocity);
// *Cv *= *velocity_damping_matrix;
// *residual -= *Cv;
// delete Cv;
// }
// }
// AKANTU_DEBUG_OUT();
// }
// /* --------------------------------------------------------------------------
// */
// void SolidMechanicsModel::solveLumped(Array<Real> & x,
// const Array<Real> & A,
// const Array<Real> & b,
// const Array<bool> & blocked_dofs,
// Real alpha) {
// Real * A_val = A.storage();
// Real * b_val = b.storage();
// Real * x_val = x.storage();
// bool * blocked_dofs_val = blocked_dofs.storage();
// UInt nb_degrees_of_freedom = x.getSize() * x.getNbComponent();
// for (UInt n = 0; n < nb_degrees_of_freedom; ++n) {
// if(!(*blocked_dofs_val)) {
// *x_val = alpha * (*b_val / *A_val);
// }
// x_val++;
// A_val++;
// b_val++;
// blocked_dofs_val++;
// }
// }
/* -------------------------------------------------------------------------- */
// void TimeStepSolverDefault::updateAcceleration() {
// AKANTU_DEBUG_IN();
// updateResidualInternal();
// if (method == _explicit_lumped_mass) {
// /* residual = residual_{n+1} - M * acceleration_n therefore
// solution = increment acceleration not acceleration */
// solveLumped(*increment_acceleration, *mass, *residual, *blocked_dofs,
// f_m2a);
// } else if (method == _explicit_consistent_mass) {
// solve<NewmarkBeta::_acceleration_corrector>(*increment_acceleration);
// }
// AKANTU_DEBUG_OUT();
// }
__END_AKANTU__
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