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Simulation Techniques and Scientific Computing

Prof. Dr.-Ing. Sabine Roller

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Welcome to the chair of Simulation Techniques and Scientific Computing of University of Siegen!

Notes for summer semester 2020

The corona pandemic results in ever changing circumstances to adapt to. In order to be able to reach all students and inform about the way teaching will take place in the upcoming semester, we would like to ask you to register to our courses via unisono in any case. Shouldn't you be able to register via unisono, please make sure to contact the respective lecturer directly by email, or, in exceptional cases, our office.

The chairs scientific interest is to develop algorithms and methods for simulations to use parallel systems for simulations. For mesh based applications, the APES program suite is developed with the aim to cover a broad variety of simulation scenarios and their use on massively parallel systems.


The APES software suite is developed for performing simulations on highly parallel systems. It contains tools to perform all necessary steps necessary for a mesh based simulation, starting with a mesh generator, several specialised solvers, up to post processing and visualisation. APES follows a modulare approach with dedicated tools for different purposes. The foundation is the central TreElM library, which implements data types and methods of the mesh. Meshes are represented using octrees, which give great flexibility in the representation of complex geometries, and at the same time are suitable for highly scalable parallel applications.

Our simulations are mainly done at the three national supercomputing centers in

With our tools, we can make use of hundreds of thousands of processing units for a particular simulation.

As an example, this is the development of a Rayleigh-Taylor Instability, as it is simulation with APES. The initial condition also shows the mesh. The result was calculated using a DG method with an order of 32.

Rayleight-Taylor Instability, initial condition Rayleight-Taylor Instability, step 1 Rayleight-Taylor Instability, step 2 Rayleight-Taylor Instability, step 3 Rayleight-Taylor Instability, step 4

The group's development portal can be accessed via: Collaboration Portal.

Before the team moved to Siegen, it was part of the German Research School for Simulation Sciences in Aachen.