Hi Praveen, 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 I am currently dealing with parameter dependent Dirichlet boundary conditions and I would like to be able to see explicitly how these parameters enter the system matrix and the right-hand side, writing the dependency in an affine way, i.e. p1 A1 + p2 A2 +...= p1 f1 + p2 f2 +.... I am currently not able to do it using the function MatrixTools::apply_boundary_values <https://www.dealii.org/8.4.0/doxygen/deal.II/namespaceMatrixTools.html#a41a069894610445f84840d712d4f891e> . Thanks for your reply! Kind regards, Giulia Il giorno mercoledì 8 febbraio 2017 17:21:46 UTC+1, Praveen C ha scritto: > > Hello Giulia > > The usual way of applying Dirichlet bc in deal.II essentially does a > lifting approach. If > > u = g on boundary > > then the lifting is > > u_{g,h}(x) = sum_(i on boundary) g(x_i) \phi_i(x) > > Did you want to use a different lifting ? > > Best > praveen > > On Wed, Feb 8, 2017 at 8:38 PM, Giulia Deolmi <giulia...@gmail.com > <javascript:>> wrote: > >> Dear deal.ii users, >> >> is there someone who implemented Nonhomogeneous Dirichlet Boundary >> conditions using a Dirichlet lift? >> >> Thanks a lot in advance, >> Kind regards, >> Giulia >> >> -- >> The deal.II project is located at http://www.dealii.org/ >> For mailing list/forum options, see >> https://groups.google.com/d/forum/dealii?hl=en >> --- >> You received this message because you are subscribed to the Google Groups >> "deal.II User Group" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to dealii+un...@googlegroups.com <javascript:>. >> For more options, visit https://groups.google.com/d/optout. >> > > -- The deal.II project is located at http://www.dealii.org/ For mailing list/forum options, see https://groups.google.com/d/forum/dealii?hl=en --- You received this message because you are subscribed to the Google Groups "deal.II User Group" group. To unsubscribe from this group and stop receiving emails from it, send an email to dealii+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
