[deal.II] Clarification on Periodic Boundary Conditions

Hello, I am trying to apply Periodic Boundary Conditions on a cubic sample in all the three directions and then compress it - compression of an RVE. The displacement I need to give is:[image: Screenshot 2021-10-20 204440.png] For this, I first applied PBC using DoFTools::make_periodicity_constrai

[deal.II] Re: Working with fully distributed triangulation: example dealii-pft/step-5

The reason why you need to add periodicity twice (independent of the type of the base tria) is that during copying the mesh the periodicity is not applied. When I implemented p:f:T I did not find an easy way to do it. Hope this helps, PM On Wednesday, 20 October 2021 at 16:19:28 UTC+2 aditya..

Re: [deal.II] Matrix construction for vector valued problems

Dear Prof. Bangerth, Thank you very much for your clear explanations. So according to that, is it still correct if I sum up the equations in discretized form? (Considering the fact that they're still containing trial and test functions, though in discretized form). Also could you please point me ou

[deal.II] Evaluating a solution at a vertex, step-13

Hello, I'm having trouble resolving the following complier error: error: ‘const class dealii::DoFCellAccessor, false>’ has no member named ‘vertex_indices’; did you mean ‘vertex_index’? I don't understand the difference between the following code and the double for-loop of step13::PointValueEv

[deal.II] Re: dealii not compiling because of boost geometry problem

Lucas, There are problems with Boost 1.77.0 (see https://github.com/dealii/dealii/issues/12817). The problems are in Boost itself and there is nothing we can do about it. Use Boost 1.76 instead. Best, Bruno On Wednesday, October 20, 2021 at 3:18:03 PM UTC-4 lucasm...@gmail.com wrote: > Hi e

[deal.II] dealii not compiling because of boost geometry problem

Hi everyone, I'm trying to install dealii on Ubuntu 20.04. For this, I manually installed the latest Boost library first (Boost 1.77.0) as described here . It looks like dealii has found this external boost library,

[deal.II] Re: Working with fully distributed triangulation: example dealii-pft/step-5

Hello, Many thanks for the reply. I went through these examples, it is quite helpful to understand the concept of copying a serial or distributed triangulation to fully distributed triangulation. I wanted some clarity in one of the examples (*copy_serial_tria_04

Re: [deal.II] Efficient Matrix-based Calculation

Dear Prof. Bangerth, Thanks for your answer. Indeed, I took the declaration of matrices out of the loop; but still, as I mentioned, the part that is substantially reducing the speed is the product between the matrices. As you mentioned, we expect this to be slower than the equivalent code in