Starting in the spring 2013, I videotaped the lectures for my MATH 676: Finite element methods in scientific computing course at the KAMU TV studio at Texas A&M. These are lectures on many aspects of scientific computing, software, and the practical aspects of the finite element method, as well as their implementation in the deal.II software library. Support for creating these videos was also provided by the National Science Foundation and the Computational Infrastructure in Geodynamics.

Note 1: In some of the videos, I demonstrate code or user interfaces. If you can't read the text, change the video quality by clicking on the "gear" symbol at the bottom right of the YouTube player.

Note 2: deal.II is an actively developed library, and in the course of this development we occasionally deprecate and remove functionality. In some cases, this implies that we also change tutorial programs, but the nature of videos is that this is not reflected in something that may have been recorded years ago. If in doubt, consult the current version of the tutorial.

Lecture 38: What preconditioner to use — Part 5: Complex ("physics-based"/"block") preconditioners for complex problems

In this last lecture on preconditioners, I consider how ideas for preconditioning coupled, multi-physics problems (so-called "physics-based preconditioners") have informed our understanding how we can use the block structure of the system matrix to obtain better preconditioners. These "block" preconditioners look at the problem from a global perspective, rather than the node-by-node perspective discussed in the previous lecture, and have been shown to be exceptionally efficient. They are used, for example, in the deal.II tutorial programs step-20, step-22, step-31, step-32.

Slides: click here