Christoph Altmann

Institute of Aerodynamics and Gas Dynamics
Pfaffenwaldring 21
70569 Stuttgart Germany

Research topics

  • Discontinuous Galerkin (DG)
  • Magnetohydrodynamics (MHD)
  • Shock capturing
  • High performance computing (HPC)

Research description

Plasma flows occur in many areas of natural sciences and engineering: From the birth of new galaxies or planets and space vehicle thruster to new high voltage devices or nuclear fusion reactors, plasma flows play an important role. With the help of the magnetohydrodynamic (MHD) equations, these problems can be simulated. With high order accurate Discontinuous Galerkin (DG) methods, new ways in simulation of plasma flows are unlocked. A high value is set on an efficient method for cleaning divergence errors that occur in MHD calculations.

High order numerical methods tend to generate oscillations at discontinuities or steep gradients like shocks. This will negatively affect the accuracy or even break the computation. Using artificial viscosity, we are able to resolve shock profiles and use the high order accuracy of the numerical scheme for a sharp shock display.

Especially turbulent calculations pose high demands on hardware (computer architectures) and software (highly efficient parallel codes). Small eddies need a very fine discretization and thus a high computing power. High performance computing (HPC) aims at exactly these aspects: Codes need to be optimized to run large massively parallel calculations on modern clusters and supercomputers. This includes a reasonable post-processing of the huge data amounts, generated by these computations. We are currently working on clusters and supercomputers in Jülich (Jugene, Juropa), Munich (HLRBII, SuperMuc) and Stuttgart (NEC Nehalem, Cray XE6).