My main research interests:

Stellar astrophysics and fluid dynamics

Stellar atmospheres, spectroscopy, and observations

• Model atmospheres 
• Vienna New Model Grid of Stellar Atmospheres (NeMo)
(page currently inactive)
• Stellar flux distributions for population synthesis of galaxies
• Stellar atmospheres and fundamental parameters of stars
• Chemically peculiar stars
• Observational high resolution stellar spectroscopy

Stellar interiors and stellar evolution

• Stellar convection, stellar structure and evolution
• Solar convection
• Helioseismology and asteroseismology

Fluid dynamical processes in stars and elsewhere

• Turbulence and non-linear dynamics
• Statistical and numerical modelling of turbulence
• A computational research enterprise (ACORE)
• Turbulent mixing in stars and in geophysics
• Diffusive and double-diffusive convection

Data bases for astrophysics

Atomic data and molecular data for astrophysical and general spectroscopy 

• The Vienna Atomic Line Database (VALD)
• The Virtual Atomic and Molecular Data Centre (VAMDC)

Numerical mathematics

• Numerical solution of partial differential equations


• Time integration of ordinary and partial differential equations


• Sparse grid and ENO methods


• Implicit and relaxation methods


• Functional analysis

High performance computing

Some equipment used in research collaborations

• The Vienna Scientific Cluster (VSC).
  
  It usually consists of two independent clusters unless a new system is currently set up to replace
  the second last generation of hardware. Previously used hardware included VSC-1 and VSC-2,
  a Sun Fire X2270 cluster and an even larger system by MEGWARE, both hosted by the TU Wien, Austria
  (used within the research collaboration with ACORE at the Faculty of Mathematics, Univ. of Vienna)
  Currently, VSC-3 (from ClusterVision) is used for project computatations by my team and by some of my collaborators.


• The Sun Constellation Linux Cluster Ranger (retired), Stampede (retired), Stampede 2 (getting retired),
  and Frontera (currently used for computations by my research team, see also the Frontera Homepage
  at TACC, the TEXAS Advanced Supercomputing Center.


• The (now retired systems) IBM p575 POWER and previously the IBM p575 POWER5 at RZG Garching.


• The POWER6 based system Huygens (now retired) at SARA
  within a DEISA supported and now finished research project on solar convection (SOLEX).
  Such projects are now usually conducted in the PRACE framework.


• The SGI Altix 4700 HLRB II (now retired) of LRZ as part of a follow up and now finished research project
  on solar convection: SOLARSURF (see pages 32-33 in the PDF file of this volume)
  described at Results of projects on HLRB II.

Computational Physics with N-body methods

• Numerical simulations of spiral galaxies with particle mesh and related methods


• Molecular dynamics simulations of liquids


• The Particle-Mesh Ewald Method

     Back to main page