Provided by: librheolef-dev_5.93-2_i386 bug

NAME

       2D_D -- -div 2D operator

SYNOPSIS

               form (const space V, const space& V, "2D_D");

DESCRIPTION

       Assembly  the  form  associated  to  the  div(2D(.))  components of the
       operator on the finite element space V:

                        /
                        |
               a(u,v) = |  2 Dij(ui) Dij(vj) dx
                        |
                        / Omega

       where

                       1 ( d ui   d uj )
             Dij(u) =  - ( ---- + ---- )
                       2 ( d xj   d xi )

       This form is usefull when considering elasticity or Stokes problems.

EXAMPLE

       Here is an example of the vector-valued form:

               geo omega ("square");
               space V (omega, "P2", "vector");
               form  a (V, V, "2D_D");

       Note that a factor two is here applied to the  form.   This  factor  is
       commonly used in practice.