debian man page for 2d_d

2D_D(3rheolef)							    rheolef-6.1 						    2D_D(3rheolef)

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 D(u) : D(v) 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.

rheolef-6.1							    rheolef-6.1 						    2D_D(3rheolef)