From: bangerth Date: Sun, 24 Apr 2011 18:56:01 +0000 (+0000) Subject: Discuss one other point. X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4dc65a4bc6d79344f1b3bf1836a3613716c49b46;p=dealii-svn.git Discuss one other point. git-svn-id: https://svn.dealii.org/trunk@23642 0785d39b-7218-0410-832d-ea1e28bc413d --- diff --git a/deal.II/examples/step-46/doc/intro.dox b/deal.II/examples/step-46/doc/intro.dox index 33688de8ff..e1c4cccf96 100644 --- a/deal.II/examples/step-46/doc/intro.dox +++ b/deal.II/examples/step-46/doc/intro.dox @@ -428,6 +428,15 @@ We will consider the following situation as a testcase: @image html step-46.layout.png +As discussed at the top of this document, we need to assume in a few places +that a cell is either entirely in the fluid or solid part of the domain and, +furthermore, that all children of an inactive cell also belong to the same +subdomain. This can definitely be ensured if the coarse mesh already +subdivides the mesh into solid and fluid coarse mesh cells; given the geometry +outlined above, we can do that by using an $8\times 8$ coarse mesh, +conveniently provided by the GridGenerator::subdivided_hyper_rectangle +function. + The fixed boundary at the bottom implies $\mathbf u=0$, and we also prescribe Dirichlet conditions for the flow at the top so that we get inflow at the left and outflow at the right. At the left and right