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Error estimation and saving with Kelly error

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This commit is contained in:
Vasco C. B. Ferreira
2026-07-25 18:34:02 +02:00
parent 65de1cd0aa
commit 2f202ee871
5 changed files with 37 additions and 34 deletions
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nufi/poisson_problem.h
+24 -19
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@@ -1,9 +1,7 @@
#ifndef POISSON_PROBLEM_H
#define POISSON_PROBLEM_H
#include <cstddef>
#include <deal.II/base/function.h>
#include <deal.II/base/index_set.h>
#include <deal.II/base/logstream.h>
#include <deal.II/base/mpi_remote_point_evaluation.h>
@@ -42,6 +40,7 @@
#include <deal.II/numerics/solution_transfer.h>
#include <deal.II/numerics/vector_tools.h>
#include <cstddef>
#include <deal.II/numerics/vector_tools_evaluate.h>
#include <deal.II/numerics/vector_tools_interpolate.h>
#include <deal.II/numerics/vector_tools_point_gradient.h>
@@ -49,6 +48,7 @@
#include <fstream>
#include <functional>
#include <iostream>
#include <limits>
#include <string>
#include <utility>
#include <vector>
@@ -91,6 +91,7 @@ public:
return constraints;
}
const CellLocator<dim> &get_locator() const { return cell_locator; }
double get_error_estimate() const { return error_estimate; }
std::vector<double> sample_electric_field(double x_min, double x_max,
unsigned int Nx);
@@ -108,6 +109,7 @@ private:
void setup_system();
void assemble_system();
void solve(size_t it);
void estimate_error();
std::function<std::vector<double>(const std::vector<Point<dim>> &)>
rhs_function;
@@ -124,6 +126,7 @@ private:
Vector<double> system_rhs;
const bool PRINT_GAUGE_DOF_POSITION = true;
double error_estimate = 0.0;
};
//====//====//
@@ -336,10 +339,6 @@ template <int dim> void PoissonProblem<dim>::setup_system() {
// used for evaluator to avoid running it anytime there is an eval
cell_locator.rebuild(dof_handler, triangulation);
// local_solution_buffer.resize(fe.n_dofs_per_cell());
// evaluator = std::make_unique<FEPointEvaluation<dim, dim>>(mapping, fe,
// update_gradients);
}
template <int dim> void PoissonProblem<dim>::assemble_system() {
@@ -419,21 +418,15 @@ template <int dim> void PoissonProblem<dim>::coarse_and_refine_grid(size_t it) {
dof_handler, QGauss<dim - 1>(fe.degree + 1),
std::map<types::boundary_id, const Function<dim> *>(), solution,
error_per_cell);
GridRefinement::refine_and_coarsen_fixed_number(triangulation, error_per_cell,
0.3, 0.03);
// START: remove refinment flags from edges of domain to alow safe gauge
// fixing
// for (const auto &cell : triangulation.active_cell_iterators()) {
// const double x = cell->center()[0];
// if (x >= Parameters::X_DOMAIN_RIGHT - .5) {
// cell->clear_refine_flag();
// cell->clear_coarsen_flag();
// }
// }
// END
// GridRefinement::refine_and_coarsen_fixed_number(triangulation,
// error_per_cell,
// 0.3, 0.03);
GridRefinement::refine_and_coarsen_fixed_fraction(
triangulation, error_per_cell, Parameters::REFINEMENT_TOP_FRACTION,
Parameters::REFINEMENT_BOTTOM_FRACTION,
std::numeric_limits<unsigned int>::max(), VectorTools::L2_norm);
// triangulation.prepare_coarsening_and_refinement();
triangulation.execute_coarsening_and_refinement();
std::cout << "Refinement Finished..." << "\n";
@@ -450,6 +443,17 @@ template <int dim> void PoissonProblem<dim>::coarse_and_refine_grid(size_t it) {
// save_space_vector(Ex, "Ex_after_coarsed", it);
}
template <int dim> void PoissonProblem<dim>::estimate_error() {
Vector<float> error_per_cell(triangulation.n_active_cells());
KellyErrorEstimator<dim>::estimate(
dof_handler, QGauss<dim - 1>(fe.degree + 1),
std::map<types::boundary_id, const Function<dim> *>(), solution,
error_per_cell);
error_estimate = error_per_cell.l2_norm();
}
template <int dim> void PoissonProblem<dim>::solve(size_t it) {
std::cout << "Calling PoissonProblem::solve for time-step " << it << "\n";
@@ -499,6 +503,7 @@ void PoissonProblem<dim>::solve_step(
}
assemble_system();
solve(it);
estimate_error();
}
// NuFI doesnt use this, kept only for testing PoissonProblem