From 5cfe377d9d6819f31e6febf0bb40c11a1357f9fd Mon Sep 17 00:00:00 2001
From: Wolfgang Bangerth <bangerth@colostate.edu>
Date: Tue, 16 Mar 2021 11:29:24 +0100
Subject: [PATCH] Use current_solution instead of present_solution.

---
 examples/step-15/step-15.cc | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/examples/step-15/step-15.cc b/examples/step-15/step-15.cc
index d88397a120..b0fb7d67cc 100644
--- a/examples/step-15/step-15.cc
+++ b/examples/step-15/step-15.cc
@@ -123,7 +123,7 @@ namespace Step15
     SparsityPattern      sparsity_pattern;
     SparseMatrix<double> system_matrix;
 
-    Vector<double> present_solution;
+    Vector<double> current_solution;
     Vector<double> newton_update;
     Vector<double> system_rhs;
   };
@@ -188,7 +188,7 @@ namespace Step15
     if (initial_step)
       {
         dof_handler.distribute_dofs(fe);
-        present_solution.reinit(dof_handler.n_dofs());
+        current_solution.reinit(dof_handler.n_dofs());
 
         hanging_node_constraints.clear();
         DoFTools::make_hanging_node_constraints(dof_handler,
@@ -263,7 +263,7 @@ namespace Step15
         // cell with which the FEValues object has last been reinitialized.
         // The values of the gradients at all quadrature points are then written
         // into the second argument:
-        fe_values.get_function_gradients(present_solution,
+        fe_values.get_function_gradients(current_solution,
                                          old_solution_gradients);
 
         // With this, we can then do the integration loop over all quadrature
@@ -352,7 +352,7 @@ namespace Step15
     hanging_node_constraints.distribute(newton_update);
 
     const double alpha = determine_step_length();
-    present_solution.add(alpha, newton_update);
+    current_solution.add(alpha, newton_update);
   }
 
 
@@ -371,7 +371,7 @@ namespace Step15
       dof_handler,
       QGauss<dim - 1>(fe.degree + 1),
       std::map<types::boundary_id, const Function<dim> *>(),
-      present_solution,
+      current_solution,
       estimated_error_per_cell);
 
     GridRefinement::refine_and_coarsen_fixed_number(triangulation,
@@ -403,7 +403,7 @@ namespace Step15
     // by doing the actual refinement and distribution of degrees of freedom
     // on the new mesh
     SolutionTransfer<dim> solution_transfer(dof_handler);
-    solution_transfer.prepare_for_coarsening_and_refinement(present_solution);
+    solution_transfer.prepare_for_coarsening_and_refinement(current_solution);
 
     triangulation.execute_coarsening_and_refinement();
 
@@ -421,8 +421,8 @@ namespace Step15
     // solution before refinement had the correct boundary values, and so we
     // have to explicitly make sure that it now has:
     Vector<double> tmp(dof_handler.n_dofs());
-    solution_transfer.interpolate(present_solution, tmp);
-    present_solution = tmp;
+    solution_transfer.interpolate(current_solution, tmp);
+    current_solution = tmp;
 
     set_boundary_values();
 
@@ -438,7 +438,7 @@ namespace Step15
                                             hanging_node_constraints);
     hanging_node_constraints.close();
 
-    hanging_node_constraints.distribute(present_solution);
+    hanging_node_constraints.distribute(current_solution);
 
     // We end the function by updating all the remaining data structures,
     // indicating to <code>setup_dofs()</code> that this is not the first
@@ -467,7 +467,7 @@ namespace Step15
                                              BoundaryValues<dim>(),
                                              boundary_values);
     for (auto &boundary_value : boundary_values)
-      present_solution(boundary_value.first) = boundary_value.second;
+      current_solution(boundary_value.first) = boundary_value.second;
   }
 
 
@@ -494,7 +494,7 @@ namespace Step15
     Vector<double> residual(dof_handler.n_dofs());
 
     Vector<double> evaluation_point(dof_handler.n_dofs());
-    evaluation_point = present_solution;
+    evaluation_point = current_solution;
     evaluation_point.add(alpha, newton_update);
 
     const QGauss<dim> quadrature_formula(fe.degree + 1);
@@ -670,7 +670,7 @@ namespace Step15
         DataOut<dim> data_out;
 
         data_out.attach_dof_handler(dof_handler);
-        data_out.add_data_vector(present_solution, "solution");
+        data_out.add_data_vector(current_solution, "solution");
         data_out.add_data_vector(newton_update, "update");
         data_out.build_patches();
 
-- 
2.39.5