]> https://gitweb.dealii.org/ - dealii-svn.git/commitdiff
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authorbangerth <bangerth@0785d39b-7218-0410-832d-ea1e28bc413d>
Tue, 28 Oct 2008 19:52:12 +0000 (19:52 +0000)
committerbangerth <bangerth@0785d39b-7218-0410-832d-ea1e28bc413d>
Tue, 28 Oct 2008 19:52:12 +0000 (19:52 +0000)
git-svn-id: https://svn.dealii.org/trunk@17378 0785d39b-7218-0410-832d-ea1e28bc413d

deal.II/examples/step-31/step-31.cc

index 9fe26f6468ca4a03cccd97c1688badd3589d3d70..4101308398029b874c75be11d8e93b25fbba25a7 100644 (file)
@@ -2432,18 +2432,24 @@ void BoussinesqFlowProblem<dim>::output_results ()  const
                                   // local dofs looks like on the present
                                   // cell, which concludes this tedious work.
                                   // 
-                                  // There's one thing worth remembering
-                                  // when looking at the output: In our
-                                  // algorithm, we first solve for the
-                                  // Stokes system at time level <i>n-1</i>
-                                  // and then for the temperature at time
-                                  // level <i>n</i>. These are the two
-                                  // components we join for output, so what
-                                  // one is going to look at has this
-                                  // little misalignment. Since output is
-                                  // only a qualititative mean anyway, we
-                                  // can ignore this $\mathcal{O}(h)$
-                                  // error.
+                                  // There's one thing worth
+                                  // remembering when looking at the
+                                  // output: In our algorithm, we
+                                  // first solve for the Stokes
+                                  // system at time level <i>n-1</i>
+                                  // in each time step and then for
+                                  // the temperature at time level
+                                  // <i>n</i> using the previously
+                                  // computed velocity. These are the
+                                  // two components we join for
+                                  // output, so these two parts of
+                                  // the output file are actually
+                                  // misaligned by one time
+                                  // step. Since we consider
+                                  // graphical output as only a
+                                  // qualititative means to
+                                  // understand a solution, we ignore
+                                  // this $\mathcal{O}(h)$ error.
   {
     std::vector<unsigned int> local_joint_dof_indices (joint_fe.dofs_per_cell);
     std::vector<unsigned int> local_stokes_dof_indices (stokes_fe.dofs_per_cell);

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