Mihai, > I am trying to identify the boundary DoFs associated with my problem - > by identify I mean finding out their indices in the global solution > vector. For example, in step-12 (advection with DG) we have fixed > boundary conditions on the inflow boundary. I would like to find out > what entries of the solution vector correspond to those boundary values.
step-12 actually is different from most other programs because it uses discontinuous elements in which (logically) all degrees of freedom are *interior* to a cell, whereas for continuous elements they sit on the boundary of cells. Which kind are you using? If you use continuous elements, then you may want to consider DoFTools::extract_boundary_dofs :-) W. ------------------------------------------------------------------------- Wolfgang Bangerth email: [email protected] www: http://www.math.tamu.edu/~bangerth/ _______________________________________________ dealii mailing list http://poisson.dealii.org/mailman/listinfo/dealii
