]> https://gitweb.dealii.org/ - dealii.git/commitdiff
Update comment about no normal flux boundary conditions around reentrant corners
authorMartin Kronbichler <kronbichler@lnm.mw.tum.de>
Sat, 24 Aug 2013 02:02:52 +0000 (02:02 +0000)
committerMartin Kronbichler <kronbichler@lnm.mw.tum.de>
Sat, 24 Aug 2013 02:02:52 +0000 (02:02 +0000)
git-svn-id: https://svn.dealii.org/trunk@30471 0785d39b-7218-0410-832d-ea1e28bc413d

deal.II/include/deal.II/numerics/vector_tools.h

index f83d28fc42218d470c6da991bae14650ad9bb78e..5cb317c4976aba105ed8f0926e15320a6a333489 100644 (file)
@@ -1529,7 +1529,13 @@ namespace VectorTools
    * different boundary indicators and call this function twice, once for each
    * boundary indicators; doing so will yield only one normal vector at this
    * point per invocation (because we consider only one boundary part at a
-   * time), with the result that the normal vectors will not be averaged.
+   * time), with the result that the normal vectors will not be averaged. This
+   * situation also needs to be taken into account when using this function
+   * around reentrant corners on Cartesian meshes. If no-normal-flux boundary
+   * conditions are to be enforced on non-Cartesian meshes around reentrant
+   * corners, one may even get cycles in the constraints as one will in
+   * general constrain different components from the two sides. In that case,
+   * set a no-slip constraint on the reentrant vertex first.
    *
    *
    * <h4>Computing constraints in 3d</h4>

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