Provided by: librheolef-dev_5.93-2_i386
2D_D -- -div 2D operator
form (const space V, const space& V, "2D_D");
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
1 ( d ui d uj )
Dij(u) = - ( ---- + ---- )
2 ( d xj d xi )
This form is usefull when considering elasticity or Stokes problems.
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.