[deal.II] deal.II Newsletter #72

Hello everyone! This is deal.II newsletter #72. It automatically reports recently merged features and discussions about the deal.II finite element library. ## Below you find a list of recently proposed or merged features: #7862: Add documentation for initialising Trilinos AMG constant modes

Re: [deal.II] Is parallel direct solver extremely slow?

Dear Pai, I'm very interested in solving a problem with characteristics very similar to yours. Consequently, I run your modified code of step-17.cc for 30*30*30 cells and for me it takes 6.43s with cg with -np 2 instead of 0.39s. Do you have any idea where this huge speed up migth come from?

[deal.II] Function transfer from coarse to fine grid

Hello everybody, having created a grid (let's call it coarse grid), copied and refined it globally two times (let's call this one fine grid), I struggle with transferring an interpolated function from the coarse to the fine grid. I am using deal.ii 8.5.1. First I interpolated the function on

Re: [deal.II] Re: Applying boundary values in parll::distr:triang setting for two dof_handler Sparsematrux

Hi. Thanks a lot for the advice. I will Try it tomorrow and send a response whether it works. Regards Gabriel Gabriel Peters Endenicher Str. 310 53121 Bonn 00491525/5478185 gabriel.pet...@koeln.de Am 26.03.19 um 13:32 schrieb Daniel Arndt > Gabriel, > > > > I am trying to apply boundary

Re: [deal.II] Pure Neumann BCs in mixed form

On 3/26/19 5:29 AM, Konrad wrote: > Issue resolved. I used the wrong sparsity pattern. That was just a typo in > the > code. Sorry for having bothered you with this but anyway: Well, glad you found the problem. Also, doh for deriving the compatibility condition -- that was too simply for me

[deal.II] Re: Applying boundary values in parll::distr:triang setting for two dof_handler Sparsematrux

Gabriel, > I am trying to apply boundary conditions on a Sparsematrix with two > Dof_handlers in a parallel::distributed::trinagulation setting for the > Step-35 tutorial. > ( Same context as in this thread > https://groups.google.com/forum/#!topic/dealii/9ibgrQ0mFBs). > > At initializing the

Re: [deal.II] Pure Neumann BCs in mixed form

Issue resolved. I used the wrong sparsity pattern. That was just a typo in the code. Sorry for having bothered you with this but anyway: Many thanks, Konrad -- The deal.II project is located at http://www.dealii.org/ For mailing list/forum options, see

Re: [deal.II] step-22 compute_no_normal_flux_constraints

Hi Wolfgang, So this was why I couldn't figure it out. The mesh has over 10 cells in it, it is super refined. And oddly, when the refinement level is less, it doesn't blow up. It's only after a certain point. it is an even global refinement, starting from a hyper divided rectangle. no

Re: [deal.II] Pure Neumann BCs in mixed form

Hi Wolfgang, > Precisely what do you see? >> > > Chaotic distribution of values in the solution several orders of > magnitudes higher than what I expect. > > >> I haven't heard of this, but that doesn't mean anything. How do you >> actually derive the compatibility condition in the mixed

[deal.II] Applying boundary values in parll::distr:triang setting for two dof_handler Sparsematrux

Hey everyone, I am trying to apply boundary conditions on a Sparsematrix with two Dof_handlers in a parallel::distributed::trinagulation setting for the Step-35 tutorial. ( Same context as in this thread https://groups.google.com/forum/#!topic/dealii/9ibgrQ0mFBs). At initializing the