Hi Rolf, Step-55 <https://www.dealii.org/8.5.0/doxygen/deal.II/step_55.html> has PETSc compatibility and constructs a block system. You can look there for information as to how to initialise the block system.
I hope that this helps. Regards, Jean-Paul On Friday, August 18, 2017 at 3:38:19 PM UTC+2, Rolf Wester wrote: > > Hi Wolfgang, > > I still try to implement it. There is one point that I could not figure > out until now. I need PETScWrappers::BlockSparseMatrix for the eigensolver > and I don't know how to initialize these with the block information. I have > two function spaces, FE_Nedelec<dim>(order-1) and FE_DGQ<dim>(order). > > Kind regards > Rolf > > Am Donnerstag, 17. August 2017 18:10:06 UTC+2 schrieb Wolfgang Bangerth: >> >> On 08/17/2017 08:59 AM, Rolf Wester wrote: >> > >> > I would like to compute eigen-solutions of optical waveguides with >> > z-dependence ~ exp(-i k_z z) using the deal.ii Nedelec elements. I >> found >> > some resources on this topic but no one that worked for me. I would be >> > very appreciative for a link to a deal.ii example that solves the >> > optical waveguide eigen-problem or any other help. >> >> Rolf -- I don't know whether anyone has solved this problem already (I >> suspect that there are people), but in any case, there is at least no >> code that's available to me. Absent such a code, you'll have to write >> one yourself. There are of course example programs that solve >> eigenproblems that you can use as a basis, and you only have to change >> the underlying equation you want to solve. Have you tried? What concrete >> problems did you find? >> >> Best >> W. >> >> -- >> ------------------------------------------------------------------------ >> Wolfgang Bangerth email: [email protected] >> www: http://www.math.colostate.edu/~bangerth/ >> > -- 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 [email protected]. For more options, visit https://groups.google.com/d/optout.
