Hello Wolfgang, I am using discontinuous elements :)
Best, Mihai ________________________________ Von: Wolfgang Bangerth <[email protected]> An: [email protected] CC: mihai alexe <[email protected]> Gesendet: Donnerstag, den 6. Mai 2010, 23:34:08 Uhr Betreff: Re: [deal.II] identifying (inflow) boundary DoFs in a solution 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/
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