From: Wolfgang Bangerth Date: Sat, 27 Feb 2016 20:05:29 +0000 (-0600) Subject: Update docs in a couple of places. X-Git-Tag: v8.5.0-rc1~1266^2 X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0f97b0063c0d3d5e278996bbf81963413e48484e;p=dealii.git Update docs in a couple of places. --- diff --git a/include/deal.II/numerics/vector_tools.h b/include/deal.II/numerics/vector_tools.h index 3203daec37..e7dcca2b9b 100644 --- a/include/deal.II/numerics/vector_tools.h +++ b/include/deal.II/numerics/vector_tools.h @@ -1325,7 +1325,9 @@ namespace VectorTools /** * This function computes the constraints that correspond to boundary * conditions of the form $\vec u \cdot \vec n=\vec u_\Gamma \cdot \vec n$, - * i.e. normal flux constraints if $\vec u$ is a vector-valued quantity. + * i.e., normal flux constraints where $\vec u$ is a vector-valued solution + * variable and $\vec u_\Gamma$ is a prescribed vector field whose normal + * component we want to be equal to the normal component of the solution. * These conditions have exactly the form handled by the ConstraintMatrix * class, so instead of creating a map between boundary degrees of freedom * and corresponding value, we here create a list of constraints that are @@ -1539,7 +1541,8 @@ namespace VectorTools const Mapping &mapping = StaticMappingQ1::mapping); /** - * Same as above for homogeneous normal-flux constraints. + * Same as above for homogeneous normal-flux constraints, i.e., for + * imposing the condition $\vec u \cdot \vec n= 0$. * * @ingroup constraints * @@ -1557,12 +1560,14 @@ namespace VectorTools /** * Compute the constraints that correspond to boundary conditions of the - * form $\vec u \times \vec n=\vec u_\Gamma \times \vec n$, i.e. tangential - * flow constraints if $\vec u$ is a vector-valued quantity. This function - * constrains exactly those vector-valued components that are left - * unconstrained by compute_no_normal_flux_constraints, and leaves the one - * component unconstrained that is constrained by - * compute_no_normal_flux_constraints. + * form $\vec u \times \vec n=\vec u_\Gamma \times \vec n$, i.e., tangential + * flow constraints where $\vec u$ is a vector-valued solution + * variable and $\vec u_\Gamma$ is prescribed vector field whose tangential + * component(s) we want to be equal to the tangential component(s) of the + * solution. This function constrains exactly those dim-1 vector-valued + * components that are left unconstrained by + * VectorTools::compute_no_normal_flux_constraints(), and leaves the one + * component unconstrained that is constrained by that function. * * @ingroup constraints *