From: bangerth Date: Tue, 28 Oct 2008 19:52:12 +0000 (+0000) Subject: More comments. X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6a797d038dac86c464ead0b2803b8cf44ebf6d95;p=dealii-svn.git More comments. git-svn-id: https://svn.dealii.org/trunk@17378 0785d39b-7218-0410-832d-ea1e28bc413d --- diff --git a/deal.II/examples/step-31/step-31.cc b/deal.II/examples/step-31/step-31.cc index 9fe26f6468..4101308398 100644 --- a/deal.II/examples/step-31/step-31.cc +++ b/deal.II/examples/step-31/step-31.cc @@ -2432,18 +2432,24 @@ void BoussinesqFlowProblem::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 n-1 - // and then for the temperature at time - // level n. 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 n-1 + // in each time step and then for + // the temperature at time level + // n 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 local_joint_dof_indices (joint_fe.dofs_per_cell); std::vector local_stokes_dof_indices (stokes_fe.dofs_per_cell);