Apply suggestions from code review

Co-authored-by: Amishga Alphonius <107414376+AmishgaAlphonius@users.noreply.github.com>

applications_tests/lethe-fluid/tracer_flow_rate.prm

@@ -1,27 +1,18 @@
 set dimension = 2
 
 subsection simulation control
-  set method           = steady
   set output frequency = 0
 end
 
-subsection FEM
-  set velocity order = 1
-  set pressure order = 1
-  set tracer order   = 1
-end
-
 subsection physical properties
-  set number of fluids = 1
   subsection fluid 0
     set kinematic viscosity = 0.01
     set tracer diffusivity  = 1
   end
 end
 
 subsection multiphysics
-  set fluid dynamics = true
-  set tracer         = true
+  set tracer = true
 end
 
 subsection mesh
@@ -70,9 +61,8 @@ subsection post-processing
   set verbosity                   = verbose
   set calculate tracer statistics = true
   set tracer statistics name      = tracer_statistics
-
-  set calculate tracer flow rate = true
-  set tracer flow rate name      = tracer_flow_rate_test
+  set calculate tracer flow rate  = true
+  set tracer flow rate name       = tracer_flow_rate_test
 end
 
 subsection non-linear solver

include/core/parameters.h

@@ -884,7 +884,7 @@ namespace Parameters
     /// Enable flow rate post-processing
     bool calculate_flow_rate;
 
-    /// Enable flow rate post-processing
+    /// Enable tracer flow rate post-processing
     bool calculate_tracer_flow_rate;
 
     /// Set initial time to start calculations for velocities
@@ -905,7 +905,7 @@ namespace Parameters
     /// Prefix for flow rate output
     std::string flow_rate_output_name;
 
-    /// Prefix for flow rate output
+    /// Prefix for tracer flow rate output
     std::string tracer_flow_rate_output_name;
 
     /// Prefix for the enstrophy output

include/solvers/tracer.h

@@ -399,7 +399,7 @@ class Tracer : public AuxiliaryPhysics<dim, GlobalVectorType>
   std::shared_ptr<SimulationControl> simulation_control;
   DoFHandler<dim>                    dof_handler;
 
-  // Finite element spce
+  // Finite element space
   std::shared_ptr<FiniteElement<dim>> fe;
 
   // Mapping and Quadrature

source/solvers/tracer.cc

@@ -687,7 +687,7 @@ Tracer<dim>::postprocess_tracer_flow_rate(const VectorType &current_solution_fd)
     tracer_flow_rate_vector[i_bc] =
       Utilities::MPI::sum(tracer_flow_rate_vector[i_bc], mpi_communicator);
 
-  // Filling table
+  // Fill table
   this->tracer_flow_rate_table.add_value(
     "time", this->simulation_control->get_current_time());
   this->tracer_flow_rate_table.set_precision("time", 12);
@@ -707,11 +707,11 @@ Tracer<dim>::postprocess_tracer_flow_rate(const VectorType &current_solution_fd)
   if (simulation_parameters.post_processing.verbosity ==
       Parameters::Verbosity::verbose)
     {
-      this->pcout << "Tracer flow rate at the boundaries : " << std::endl;
+      this->pcout << "Tracer flow rate at the boundaries: " << std::endl;
       for (unsigned int i_bc = 0;
            i_bc < this->simulation_parameters.boundary_conditions.size;
            ++i_bc)
-        this->pcout << "\t boundary " << i_bc << " : "
+        this->pcout << "\t boundary " << i_bc << ": "
                     << tracer_flow_rate_vector[i_bc] << std::endl;
     }