I created a FESystem containing three FE_Q-elements with <dim>-dimensions
each, using the suggested approach in
https://www.dealii.org/8.4.0/doxygen/deal.II/classFESystem.html:
template <int dim>
std::vector<const FiniteElement<dim>*> Diffusion<dim>::create_fe_list(
const unsigned int polynomial_degree)
{
std::vector<const FiniteElement<dim>*> fe_list;
fe_list.push_back(new FE_Q<dim>(polynomial_degree));
return fe_list;
}
template <int dim>
std::vector<unsigned int> Diffusion<dim>::create_fe_multiplicities()
{
std::vector<unsigned int> multiplicities;
multiplicities.push_back(3);
return multiplicities;
}
template <int dim>
Diffusion<dim>::VectorElementDestroyer::VectorElementDestroyer(const std
::vector<const FiniteElement<dim> *> &pointers) : data(pointers)
{}
template <int dim>
Diffusion<dim>::VectorElementDestroyer::~VectorElementDestroyer()
{
for(size_t i = 0; i < data.size(); ++i)
delete data[i];
}template <int dim>
std::vector<const FiniteElement<dim>*> Diffusion<dim>::create_fe_list(
const unsigned int polynomial_degree)
{
std::vector<const FiniteElement<dim>*> fe_list;
fe_list.push_back(new FE_Q<dim>(polynomial_degree));
return fe_list;
}
template <int dim>
std::vector<unsigned int> Diffusion<dim>::create_fe_multiplicities()
{
std::vector<unsigned int> multiplicities;
multiplicities.push_back(3);
return multiplicities;
}
template <int dim>
Diffusion<dim>::VectorElementDestroyer::VectorElementDestroyer(const std
::vector<const FiniteElement<dim> *> &pointers) : data(pointers)
{}
template <int dim>
Diffusion<dim>::VectorElementDestroyer::~VectorElementDestroyer()
{
for(size_t i = 0; i < data.size(); ++i)
delete data[i];
}
template <int dim>
const std::vector<const FiniteElement<dim>*> &Diffusion<dim>::
VectorElementDestroyer::get_data() const
{
return data;
}
finite_element(VectorElementDestroyer(create_fe_list(2)).get_data(),
create_fe_multiplicities()),
template <int dim>
const std::vector<const FiniteElement<dim>*> &Diffusion<dim>::
VectorElementDestroyer::get_data() const
{
return data;
}
finite_element(VectorElementDestroyer(create_fe_list(2)).get_data(),
create_fe_multiplicities())
In addition I created in a later function corresponding views in order to
access the different FE_Q-elements:
const FEValuesExtractors::Vector N_density(0);
const FEValuesExtractors::Vector E_temperature(dim);
const FEValuesExtractors::Vector L_temperature(2*dim);
and the corresponding code for DoFHandler and other parts:
system_matrix = 0.;
mass_matrix = 0.;
const QGauss<dim> quadrature_formula(fe_degree+1);
FEValues<dim> fe_values(finite_element, quadrature_formula,
update_values | update_gradients |
update_JxW_values);
const unsigned int dofs_per_cell = finite_element.dofs_per_cell;
const unsigned int n_q_points = quadrature_formula.size();
FullMatrix<double> cell_matrix (dofs_per_cell, dofs_per_cell);
FullMatrix<double> cell_mass_matrix (dofs_per_cell, dofs_per_cell);
std::vector<types::global_dof_index> local_dof_indices (dofs_per_cell);
std::vector<Tensor<2, dim>> gradient_N(dofs_per_cell), gradient_TE(
dofs_per_cell), gradient_TL(dofs_per_cell);
std::vector<Tensor<1, dim>> value_N(dofs_per_cell), value_TE(dofs_per_cell),
value_TL(dofs_per_cell);
for (auto cell = dof_handler.begin_active(); cell!=dof_handler.end(); ++cell
)
{
cell_matrix = 0.;
cell_mass_matrix = 0.;
fe_values.reinit (cell);
for (unsigned int q_point=0; q_point<n_q_points; ++q_point)
{
for(size_t i = 0; i < dofs_per_cell; ++i)
{
gradient_N[i] = fe_values[N_density].gradient(i, q_point
);
gradient_TE[i] = fe_values[E_temperature].gradient(i,
q_point);
gradient_TL[i] = fe_values[L_temperature].gradient(i,
q_point);
value_N[i] = fe_values[N_density].value(i, q_point);
value_TE[i] = fe_values[E_temperature].value(i, q_point
);
value_TL[i] = fe_values[L_temperature].value(i, q_point
);
}
Compilation works fine for dim=3, but when executing I get the following
error(s):
--------------------------------------------------------
An error occurred in line <3996> of file </opt/dealII/include/deal.II/fe/
fe_values.h> in function
const dealii::FEValuesViews::Vector<dim, spacedim>& dealii::FEValuesBase
<dim, spacedim>::operator[](const dealii::FEValuesExtractors::Vector&) const
[with int dim = 3; int spacedim = 3]
The violated condition was:
vector.first_vector_component < fe_values_views_cache.vectors.size()
Additional information:
Index 3 is not in the half-open range [0,1).
Stacktrace:
-----------
#0 ./ttm_test_2: Step52::Diffusion<3>::assemble_system(double)
#1 ./ttm_test_2: Step52::Diffusion<3>::run()
#2 ./ttm_test_2: main
--------------------------------------------------------
Where did I make my mistake?
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