Thanks a lot! I will have a look at it, kind regards, Giulia Il giorno giovedì 9 febbraio 2017 15:19:07 UTC+1, Wolfgang Bangerth ha scritto: > > > > as far as I have understood (but I might be wrong), the functions > > VectorTools::interpolate_boundary_values > > < > https://www.dealii.org/8.4.0/doxygen/deal.II/namespaceVectorTools.html#af6f700f193e9d5b52e9efe55e9b872d5> > > > > MatrixTools::apply_boundary_values > > < > https://www.dealii.org/8.4.0/doxygen/deal.II/namespaceMatrixTools.html#a41a069894610445f84840d712d4f891e> > > > > find the nodes where Dirichlet BC's are applied and then there impose > the > > corrensponding boundary value, after having built the system matrix and > > right-hand side. > > > > Another possibility would be to use a Dirichlet lift, change the weak > > formulation and solve for homogeneous Dirichlet boundary conditions. I > am > > wondering if someone already did this or if it somewhere implemented in > deal.ii > > It may not look like it, but that's really what the functions do that you > cite > above. > > The algorithm is a bit complicated, but take a look at lectures 21.6 and > 21.65 > here: > http://www.math.colostate.edu/~bangerth/videos.html > > Best > Wolfgang > > -- > ------------------------------------------------------------------------ > Wolfgang Bangerth email: bang...@colostate.edu > <javascript:> > www: http://www.math.colostate.edu/~bangerth/ > >
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