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


       2W -- vorticity tensor


               form (const space V, const space& T, "2W");


       Assembly  the  form  associated  to  the  vorticity  tensor,  i.e.  the
       unsymmetric part of the gradient of a vector field.   These  derivative
       are usefull in fluid mechanic.

             b(u,tau) = | 2 W(u) : tau dx,
                        / Omega


            2 D(u) = grad u - (grad u)^T

       If  the  V space is a vector-valued P1 (resp. P2) finite element space,
       the T space may be a tensor-valued P0 (resp. P1d) one.


       The following piece of code build the Laplacian form associated to  the
       P1 approximation:

               geo omega ("square");
               space V (omega, "P1", "vector");
               space T (omega, "P0", "tensor");
               form  b (V, T, "2W");