From c0fc69e4f6c4b8b73df11ee730326bf561159345 Mon Sep 17 00:00:00 2001
From: Wolfgang Bangerth <bangerth@colostate.edu>
Date: Thu, 2 Apr 2020 20:16:33 -0600
Subject: [PATCH] Use AE spelling 'disk' instead of BE spelling 'disc'.

---
 examples/step-69/step-69.cc | 52 ++++++++++++++++++-------------------
 1 file changed, 26 insertions(+), 26 deletions(-)

diff --git a/examples/step-69/step-69.cc b/examples/step-69/step-69.cc
index 1e76eb80c4..8ec450224e 100644
--- a/examples/step-69/step-69.cc
+++ b/examples/step-69/step-69.cc
@@ -164,8 +164,8 @@ namespace Step69
 
     double length;
     double height;
-    double disc_position;
-    double disc_diameter;
+    double disk_position;
+    double disk_diameter;
 
     unsigned int refinement;
   };
@@ -539,15 +539,15 @@ namespace Step69
     height = 2.;
     add_parameter("height", height, "height of computational domain");
 
-    disc_position = 0.6;
+    disk_position = 0.6;
     add_parameter("object position",
-                  disc_position,
-                  "x position of immersed disc center point");
+                  disk_position,
+                  "x position of immersed disk center point");
 
-    disc_diameter = 0.5;
+    disk_diameter = 0.5;
     add_parameter("object diameter",
-                  disc_diameter,
-                  "diameter of immersed disc");
+                  disk_diameter,
+                  "diameter of immersed disk");
 
     refinement = 5;
     add_parameter("refinement",
@@ -565,17 +565,17 @@ namespace Step69
   //
   // The <code>setup()</code> function is the last class member that has to
   // be implemented. It creates the actual triangulation that is a
-  // benchmark configuration consisting of a channel with a disc obstacle, see
+  // benchmark configuration consisting of a channel with a disk obstacle, see
   // @cite GuermondEtAl2018. We construct the geometry by modifying the
   // mesh generated by GridGenerator::hyper_cube_with_cylindrical_hole().
   // We refer to step-49, step-53, and step-54 for an overview how to
   // create advanced meshes.
   // We first create 4 temporary (non distributed) coarse triangulations
   // that we stitch together with the GridGenerator::merge_triangulation()
-  // function. We center the disc at $(0,0)$ with a diameter of
-  // <code>disc_diameter</code>. The lower left corner of the channel has
-  // coordinates (<code>-disc_position</code>, <code>-height/2</code>) and
-  // the upper right corner has (<code>length-disc_position</code>,
+  // function. We center the disk at $(0,0)$ with a diameter of
+  // <code>disk_diameter</code>. The lower left corner of the channel has
+  // coordinates (<code>-disk_position</code>, <code>-height/2</code>) and
+  // the upper right corner has (<code>length-disk_position</code>,
   // <code>height/2</code>).
   template <int dim>
   void Discretization<dim>::setup()
@@ -587,25 +587,25 @@ namespace Step69
     Triangulation<dim> tria1, tria2, tria3, tria4;
 
     GridGenerator::hyper_cube_with_cylindrical_hole(
-      tria1, disc_diameter / 2., disc_diameter, 0.5, 1, false);
+      tria1, disk_diameter / 2., disk_diameter, 0.5, 1, false);
 
     GridGenerator::subdivided_hyper_rectangle(
       tria2,
       {2, 1},
-      Point<2>(-disc_diameter, disc_diameter),
-      Point<2>(disc_diameter, height / 2.));
+      Point<2>(-disk_diameter, disk_diameter),
+      Point<2>(disk_diameter, height / 2.));
 
     GridGenerator::subdivided_hyper_rectangle(
       tria3,
       {2, 1},
-      Point<2>(-disc_diameter, -disc_diameter),
-      Point<2>(disc_diameter, -height / 2.));
+      Point<2>(-disk_diameter, -disk_diameter),
+      Point<2>(disk_diameter, -height / 2.));
 
     GridGenerator::subdivided_hyper_rectangle(
       tria4,
       {6, 4},
-      Point<2>(disc_diameter, -height / 2.),
-      Point<2>(length - disc_position, height / 2.));
+      Point<2>(disk_diameter, -height / 2.),
+      Point<2>(length - disk_position, height / 2.));
 
     GridGenerator::merge_triangulations({&tria1, &tria2, &tria3, &tria4},
                                         triangulation,
@@ -615,8 +615,8 @@ namespace Step69
     triangulation.set_manifold(0, PolarManifold<2>(Point<2>()));
 
     // We have to fix up the left edge that is currently located at
-    // $x=-$<code>disc_diameter</code> and has to be shifted to
-    // $x=-$<code>disc_position</code>. As a last step the boundary has to
+    // $x=-$<code>disk_diameter</code> and has to be shifted to
+    // $x=-$<code>disk_position</code>. As a last step the boundary has to
     // be colorized with <code>Boundaries::do_nothing</code> on the right,
     // <code>dirichlet</code> on the left and <code>free_slip</code> on the
     // upper and lower outer boundaries and the obstacle.
@@ -625,8 +625,8 @@ namespace Step69
       {
         for (unsigned int v = 0; v < GeometryInfo<dim>::vertices_per_cell; ++v)
           {
-            if (cell->vertex(v)[0] <= -disc_diameter + 1.e-6)
-              cell->vertex(v)[0] = -disc_position;
+            if (cell->vertex(v)[0] <= -disk_diameter + 1.e-6)
+              cell->vertex(v)[0] = -disk_position;
           }
       }
 
@@ -640,9 +640,9 @@ namespace Step69
               {
                 const auto center = face->center();
 
-                if (center[0] > length - disc_position - 1.e-6)
+                if (center[0] > length - disk_position - 1.e-6)
                   face->set_boundary_id(Boundaries::do_nothing);
-                else if (center[0] < -disc_position + 1.e-6)
+                else if (center[0] < -disk_position + 1.e-6)
                   face->set_boundary_id(Boundaries::dirichlet);
                 else
                   face->set_boundary_id(Boundaries::free_slip);
-- 
2.39.5