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//
// Copyright (C) 2010 - 2015 by the deal.II authors
//
// This file is part of the deal.II library.
//
// The deal.II library is free software; you can use it, 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 2.1 of the License, or (at your option) any later version.
// The full text of the license can be found in the file LICENSE at
// the top level of the deal.II distribution.
//
// ---------------------------------------------------------------------
#ifndef dealii__integrators_l2_h
#define dealii__integrators_l2_h
#include <deal.II/base/config.h>
#include <deal.II/base/exceptions.h>
#include <deal.II/base/quadrature.h>
#include <deal.II/lac/full_matrix.h>
#include <deal.II/fe/mapping.h>
#include <deal.II/fe/fe_values.h>
#include <deal.II/meshworker/dof_info.h>
DEAL_II_NAMESPACE_OPEN
namespace LocalIntegrators
{
/**
* @brief Local integrators related to <i>L<sup>2</sup></i>-inner products.
*
* @ingroup Integrators
* @author Guido Kanschat
* @date 2010
*/
namespace L2
{
/**
* The mass matrix for scalar or vector values finite elements. \f[ \int_Z
* uv\,dx \quad \text{or} \quad \int_Z \mathbf u\cdot \mathbf v\,dx \f]
*
* Likewise, this term can be used on faces, where it computes the
* integrals \f[ \int_F uv\,ds \quad \text{or} \quad \int_F \mathbf u\cdot
* \mathbf v\,ds \f]
*
* @author Guido Kanschat
* @date 2008, 2009, 2010
*/
template <int dim>
void mass_matrix (
FullMatrix<double> &M,
const FEValuesBase<dim> &fe,
const double factor = 1.)
{
const unsigned int n_dofs = fe.dofs_per_cell;
const unsigned int n_components = fe.get_fe().n_components();
for (unsigned int k=0; k<fe.n_quadrature_points; ++k)
{
const double dx = fe.JxW(k) * factor;
for (unsigned int i=0; i<n_dofs; ++i)
{
double Mii = 0.0;
for (unsigned int d=0; d<n_components; ++d)
Mii += dx
* fe.shape_value_component(i,k,d)
* fe.shape_value_component(i,k,d);
M(i,i) += Mii;
for (unsigned int j=i+1; j<n_dofs; ++j)
{
double Mij = 0.0;
for (unsigned int d=0; d<n_components; ++d)
Mij += dx
* fe.shape_value_component(j,k,d)
* fe.shape_value_component(i,k,d);
M(i,j) += Mij;
M(j,i) += Mij;
}
}
}
}
/**
* The weighted mass matrix for scalar or vector values finite elements.
* \f[ \int_Z \omega(x) uv\,dx \quad \text{or} \quad \int_Z \omega(x)
* \mathbf u\cdot \mathbf v\,dx \f]
*
* Likewise, this term can be used on faces, where it computes the
* integrals \f[ \int_F \omega(x) uv\,ds \quad \text{or} \quad \int_F
* \omega(x) \mathbf u\cdot \mathbf v\,ds \f]
*
* The size of the vector <tt>weights</tt> must be equal to the number of
* quadrature points in the finite element.
*
* @author Guido Kanschat
* @date 2014
*/
template <int dim>
void weighted_mass_matrix (
FullMatrix<double> &M,
const FEValuesBase<dim> &fe,
const std::vector<double> weights)
{
const unsigned int n_dofs = fe.dofs_per_cell;
const unsigned int n_components = fe.get_fe().n_components();
AssertDimension(M.m(), n_dofs);
AssertDimension(M.n(), n_dofs);
AssertDimension(weights.size(), fe.n_quadrature_points);
for (unsigned int k=0; k<fe.n_quadrature_points; ++k)
{
const double dx = fe.JxW(k) * weights[k];
for (unsigned int i=0; i<n_dofs; ++i)
{
double Mii = 0.0;
for (unsigned int d=0; d<n_components; ++d)
Mii += dx
* fe.shape_value_component(i,k,d)
* fe.shape_value_component(i,k,d);
M(i,i) += Mii;
for (unsigned int j=i+1; j<n_dofs; ++j)
{
double Mij = 0.0;
for (unsigned int d=0; d<n_components; ++d)
Mij += dx
* fe.shape_value_component(j,k,d)
* fe.shape_value_component(i,k,d);
M(i,j) += Mij;
M(j,i) += Mij;
}
}
}
}
/**
* <i>L<sup>2</sup></i>-inner product for scalar functions.
*
* \f[ \int_Z fv\,dx \quad \text{or} \quad \int_F fv\,ds \f]
*
* @author Guido Kanschat
* @date 2008, 2009, 2010
*/
template <int dim, typename number>
void L2 (
Vector<number> &result,
const FEValuesBase<dim> &fe,
const std::vector<double> &input,
const double factor = 1.)
{
const unsigned int n_dofs = fe.dofs_per_cell;
AssertDimension(result.size(), n_dofs);
AssertDimension(fe.get_fe().n_components(), 1);
AssertDimension(input.size(), fe.n_quadrature_points);
for (unsigned int k=0; k<fe.n_quadrature_points; ++k)
for (unsigned int i=0; i<n_dofs; ++i)
result(i) += fe.JxW(k) * factor * input[k] * fe.shape_value(i,k);
}
/**
* <i>L<sup>2</sup></i>-inner product for a slice of a vector valued right
* hand side. \f[ \int_Z \mathbf f\cdot \mathbf v\,dx \quad \text{or}
* \quad \int_F \mathbf f\cdot \mathbf v\,ds \f]
*
* @author Guido Kanschat
* @date 2008, 2009, 2010
*/
template <int dim, typename number>
void L2 (
Vector<number> &result,
const FEValuesBase<dim> &fe,
const VectorSlice<const std::vector<std::vector<double> > > &input,
const double factor = 1.)
{
const unsigned int n_dofs = fe.dofs_per_cell;
const unsigned int fe_components = fe.get_fe().n_components();
const unsigned int n_components = input.size();
AssertDimension(result.size(), n_dofs);
AssertDimension(input.size(), fe_components);
for (unsigned int k=0; k<fe.n_quadrature_points; ++k)
for (unsigned int i=0; i<n_dofs; ++i)
for (unsigned int d=0; d<n_components; ++d)
result(i) += fe.JxW(k) * factor * fe.shape_value_component(i,k,d) * input[d][k];
}
/**
* The jump matrix between two cells for scalar or vector values finite
* elements. Note that the factor $\gamma$ can be used to implement
* weighted jumps. \f[ \int_F [\gamma u][\gamma v]\,ds \quad \text{or}
* \int_F [\gamma \mathbf u]\cdot [\gamma \mathbf v]\,ds \f]
*
* Using appropriate weights, this term can be used to penalize violation
* of conformity in <i>H<sup>1</sup></i>.
*
* @author Guido Kanschat
* @date 2008, 2009, 2010
*/
template <int dim>
void jump_matrix (
FullMatrix<double> &M11,
FullMatrix<double> &M12,
FullMatrix<double> &M21,
FullMatrix<double> &M22,
const FEValuesBase<dim> &fe1,
const FEValuesBase<dim> &fe2,
const double factor1 = 1.,
const double factor2 = 1.)
{
const unsigned int n1_dofs = fe1.dofs_per_cell;
const unsigned int n2_dofs = fe2.dofs_per_cell;
const unsigned int n_components = fe1.get_fe().n_components();
Assert(n1_dofs == n2_dofs, ExcNotImplemented());
AssertDimension(n_components, fe2.get_fe().n_components());
AssertDimension(M11.m(), n1_dofs);
AssertDimension(M12.m(), n1_dofs);
AssertDimension(M21.m(), n2_dofs);
AssertDimension(M22.m(), n2_dofs);
AssertDimension(M11.n(), n1_dofs);
AssertDimension(M12.n(), n2_dofs);
AssertDimension(M21.n(), n1_dofs);
AssertDimension(M22.n(), n2_dofs);
for (unsigned int k=0; k<fe1.n_quadrature_points; ++k)
{
const double dx = fe1.JxW(k);
for (unsigned int i=0; i<n1_dofs; ++i)
for (unsigned int j=0; j<n1_dofs; ++j)
for (unsigned int d=0; d<n_components; ++d)
{
const double u1 = factor1*fe1.shape_value_component(j,k,d);
const double u2 =-factor2*fe2.shape_value_component(j,k,d);
const double v1 = factor1*fe1.shape_value_component(i,k,d);
const double v2 =-factor2*fe2.shape_value_component(i,k,d);
M11(i,j) += dx * u1*v1;
M12(i,j) += dx * u2*v1;
M21(i,j) += dx * u1*v2;
M22(i,j) += dx * u2*v2;
}
}
}
}
}
DEAL_II_NAMESPACE_CLOSE
#endif
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