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Numerical Analysis Seminar

Seminarium

Tid: 2021-01-27 15:15 till 16:15
Plats: via Zoom link (contact Alexandros Sopasakis)
Kontakt: alexandros [dot] sopasakis [at] math [dot] lth [dot] se
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Julia for adaptive high-order multi-physics simulations by Michael Schlottke-Lakemper from Mathematics, University of Cologne, Germany.

Julia has been touted as a programming language especially well-suited for numerical analysis and scientific computing. However, while its prevalence is steadily increasing, it has not yet seen widespread adoption in the computational science or high-performance computing communities. One of the hurdles is a (perceived) lack of real-world examples that show how Julia can be used to conduct numerical simulations and what its advantages and drawbacks are for scientific applications.
To remediate this, in this talk we discuss the development of a purely hyperbolic method for self-gravitating gas dynamics within our Julia-based open source simulation framework Trixi.jl (https://github.com/trixi-framework/Trixi.jl). In this approach, we reformulate the elliptic gravity problem into a hyperbolic diffusion problem, which is solved in pseudotime using the same explicit high-order discontinuous Galerkin method we use for the flow solution. A key benefit is that in the resulting multi-physics simulation problem, we can reuse existing hyperbolic solvers while retaining advanced features such as non-conforming and solution-adaptive meshes.
Next to presenting numerical results, we will critically examine our experience with building a multi-physics simulation framework with Julia. We will discuss its strengths and weaknesses as a programming language for research software engineering, including an assessment of how Julia’s claimed benefits hold up against scientific reality, and give a live demonstration of Julia and Trixi.jl in action.

To make the shown examples reproducible by the audience, the Jupyter notebook used for the live demonstration is available at https://github.com/trixi-framework/talk-2021-julia-adaptive-multi-physics-simulations. It can be either run from a local Julia/Jupyter installation or in the cloud via Binder (without having to install Julia locally).