Search

Navigation and service

Latest Projects (Overview)

Find out about the latest simulation projects run on the GCS supercomputers. For the complete overview of projects, sorted by research fields, please choose from the list in the left column.

Flavor Singlet Physics with Background Fields

Flavor Singlet Physics with Background Fields

The calculation of sea quark and gluon content of hadrons, which can be traced back to flavour singlet hadron matrix elements, is one of the greatest technical challenges left in lattice QCD. This is due to the fact that the lattice calculation of so-called "disconnected diagrams" is extremely noisy and gives a poor signal. An improved determination of these disconnected contributions was the main aim of this project. For that, physicists of the QCDSF collaboration have proposed an alternative to the conventional three-point function technique (3-pt) for the study of hadron matrix elements in lattice QCD.
  
Principal Investigator: Arwed Schiller, Institut für Theoretische Physik, Leipzig University, Germany (QCDSF collaboration)
HPC Platform: JUQUEEN of JSC - Date published: December 2017
More: Flavor Singlet Physics with Background Fields …

Longtime 3D Supernova Simulations for Establishing the Progenitor-Remnant Connection

Longtime 3D Supernova Simulations for Establishing the Progenitor-Remnant Connection

Recently the first three-dimensional simulations have confirmed the long-standing hypothesis that the neutrino-driven mechanism, supported by violent hydrodynamic instabilities and turbulent mass flows, can explain supernova explosions of stars with more than 8−10 solar masses. Further consolidation of this mechanism and a deeper theoretical understanding of its functioning require the exploration of a broader variety of progenitor stars and of dependences on the initial conditions prior to iron-core collapse. In this Gauss project the influence of stellar rotation, perturbations in the convective oxygen-burning layer, and of large mass-infall rates due to high core compactness in very massive progenitor stars were explored.
  
Principal Investigator: Hans-Thomas Janka, Max Planck Institute for Astrophysics, Garching (Germany)
HPC Platform: SuperMUC of LRZ - Date published: November 2017
More: Longtime 3D Supernova Simulations for Establishing the Progenitor-Remnant Connection …

The World’s Largest Turbulence Simulations

The World’s Largest Turbulence Simulations

Interstellar turbulence shapes the structure of the multi-phase interstellar medium (ISM) and is a key process in the formation of molecular clouds as well as the build-up of star clusters in their interior. The key ingredient for our theoretical understanding of ISM dynamics and stellar birth is the sonic scale in the turbulent cascade, which marks the transition from supersonic to subsonic turbulence and produces a break in the turbulence power spectrum. To measure this scale and study the sonic transition region in detail, scientists, for the first time, ran a simulation with the unprecedented resolution of 10,0483 grid cells.
  
Principal Investigators: Ralf Klessen, Universität Heidelberg (Germany) and Christoph Federrath, Australian National University
HPC Platform: SuperMUC of LRZ - Date published: November 2017
More: The World’s Largest Turbulence Simulations …

Metal Enrichment by Turbulent Mixing in Cosmological Simulations

Metal Enrichment by Turbulent Mixing in Cosmological Simulations

The modelling of star formation and feedback processes such as supernova explosions is a longstanding problem in numerical simulations of cosmological structure formation because the internal structure of galaxies cannot be resolved in sufficient detail even on very powerful supercomputers. For this reason, star formation and stellar feedback are treated as so-called subgrid physics. The aim of this project is to combine standard recipes for star formation in simulations on cosmological scales with a subgrid-scale model for numerically unresolved turbulence, which allows to study the influence of turbulence on star formation and the mixing of metals expelled by supernova explosions in galaxies.
  
Principal Investigator: Wolfram Schmidt, Institut für Astrophysik, Universität Göttingen, and Hamburger Sternwarte, Universität Hamburg (Germany)
HPC Platform: SuperMUC of LRZ - Date published: November 2017
More: Metal Enrichment by Turbulent Mixing in Cosmological Simulations …

Towards Resolving the Turbulent Cascade in Self-Consistent 3D Core-Collapse Supernova Simulations

Towards Resolving the Turbulent Cascade in Self-Consistent 3D Core-Collapse Supernova Simulations

First self-consistent, first-principle simulations in three dimensions have provided support for the viability of the neutrino-driven mechanism as an explanation of supernova explosions of stars with more than 8−10 solar masses. While these results respresent fundamentally important progress in our understanding of how massive stars terminate their lives, the enormous complexity and computational demand of the involved neutrino physics set severe resolution limitations to current full-scale supernova models. In this project, the numerical convergence of the present simulations were investigated.
  
Principal Investigator: Hans-Thomas Janka, Max Planck Institute for Astrophysics, Garching (Germany)
HPC Platform: SuperMUC of LRZ - Date published: November 2017
More: Towards Resolving the Turbulent Cascade in Self-Consistent 3D Core-Collapse Supernova Simulations …

First-Principles Modeling of Minerals, Melts and Fluids at High Pressures and High Temperatures

First-Principles Modeling of Minerals, Melts and Fluids at High Pressures and High Temperatures

Comprehension of processes in the deep Earth’s interior requires knowledge of the structure and properties of geologically relevant materials at high pressures and high temperatures. In this project, first-principles molecular dynamics simulations are employed to complement experimental efforts to study mainly structurally disordered materials under extreme conditions. For instance, in a recent study the structure of SiO2 glass was studied up to pressures of more than 1.5 Mbar. Further, the feasibility of predicting element partitioning between melts from first-principles has been explored.

Principal Investigator: Sandro Jahn, Institute of Geology and Mineralogy, University of Cologne (Germany)
HPC Platform: JUQUEEN of JSC - Date published: November 2017
More: First-Principles Modeling of Minerals, Melts and Fluids at High Pressures and High Temperatures …

High Resolution Climate Modelling

High Resolution Climate Modelling

Modelling of the regional present day as well as future climate is of great interest both scientifically as well as for applications. The “Regional Climate and Water Cycle Group” at KIT Karlsruhe uses the COSMO-CLM regional climate model for detailed climate simulations in various parts of the world. Many of these quite expensive and storage intensive runs are performed on Hazel Hen at HLRS. After giving a motivation for high resolution climate modelling, the scientists briefly describe some technical aspects like nesting and ensemble building and then go to a short presentation of some results concerning the future climate in Baden-Württemberg.

Principal Investigator: Gerd Schädler, Institute of Meteorology and Climate Research, Department Troposphere Research (IMK-TRO), Karlsruhe Institute of Technology, Karlsruhe, Germany (Germany)
HPC Platform: Hazel Hen of HLRS - Date published: November 2017
More: High Resolution Climate Modelling …

Rapid and Accurate Calculation of Ligand-Protein Binding Free Energies

Rapid and Accurate Calculation of Ligand-Protein Binding Free Energies

Rapid and accurate calculation of binding free energies is of major concern in drug discovery and personalized medicine. A pan-European research team leveraged the computing power of LRZ’s SuperMUC system to predict the strength of macromolecular binding free energies of ligands to proteins. An in-house developed, highly automated, molecular-simulation-based free energy calculation workflow tool assisted the team in achieving optimal efficiency in its modelling and calculations, resulting in rapid, reliable, accurate and precise predictions of binding free energies.
  
Principal Investigators: Dieter Kranzlmüller, Ludwig-Maximilians-Universität, München (Germany), and Peter V. Coveney, Centre for Computational Science, University College London (UK)
HPC Platform: SuperMUC of LRZ - Date published: November 2017
More: Rapid and Accurate Calculation of Ligand-Protein Binding Free Energies …

Phenomenology of Strange Resonances

Phenomenology of Strange Resonances

The phenomenology of freeze-out and hadronization in heavy ion collision experiments greatly benefits from the availability of the Hadron Resonance Gas model. This, however, assumes the complete knowledge of the particle spectrum in a broad range. Alas, many of the bound states have not been found yet. In this project, researchers narrow down on the missing states using large scale lattice QCD computations.
  
Principal Investigator: Zoltán Fodor, Bergische Universität Wuppertal (Germany)
HPC Platforms: JUQUEEN of JSC and Hazel Hen of HLRS - Date published: November 2017
More: Phenomenology of Strange Resonances …

Non-Zero Density Simulations in Full QCD

Non-Zero Density Simulations in Full QCD

The simulation of nuclear matter at nonzero baryon density presents a notoriously hard problem in lattice QCD. The usual simulation strategies depend on the exploration of the configuration space by interpreting the weight of each configuration in an average as a probability, which is however not valid here as the weight is non positive. This is called the ‘sign problem’ of nonzero density QCD. In this project the researchers compare two different simulation strategies which evade the sign problem with very different methods.
  
Principal Investigator: Dénes Sexty, Heisenberg Fellow, Bergische Universität Wuppertal (Germany)
HPC Platform: SuperMUC of LRZ - Date published: October 2017
More: Non-Zero Density Simulations in Full QCD …

The Calculation of the Axion Mass from Lattice QCD

The Calculation of the Axion Mass from Lattice QCD

A large part of the universe consists of the so called dark matter. This is a form of matter, that interacts only very weakly with the every day, baryonic matter. A candidate for a dark matter particle is the axion. To increase the chances of detecting such a particle, the knowledge of its properties is important. In this project Lattice QCD is used to determine a mass estimate of the axion. This requires the use of supercomputers as well as the invention of new techniques to reduce the computational cost.
  
Principal Investigator: Zoltán Fodor, Bergische Universität Wuppertal (Germany)
HPC Platform: JUQUEEN of JSC - Date published: October 2017
More: The Calculation of the Axion Mass from Lattice QCD …

Transport in the Gluon Plasma

Transport in the Gluon Plasma

The viscosity of a fluid is a measure of its resistance to deformation by shear stress. One of the least viscous fluids ever observed is that of the quark gluon plasma, created in heavy ion collisions. Nevertheless reliably calculating the equilibrium viscosity of the quark gluon plasma remains to be one of the big open challenges in heavy ion physics. In this project, researchers perform simulations to improve on previous estimates of this important quantity.
  
Principal Investigator: Dénes Sexty, Heisenberg Fellow, Bergische Universität Wuppertal (Germany)
HPC Platform: JUQUEEN of JSC - Date published: October 2017
More: Transport in the Gluon Plasma …

SCBOPT

SCBOPT - Shock Control Bump Optimization

In order to significantly reduce the drag and the environmental impact of future aircraft, considerable effort has to be undertaken in all fields of aircraft design. Besides reducing drag around the cruise condition of typical transport aircraft, it is also of great interest to expand the flight envelope in order to allow for a more flexible design. Understanding the behaviour of a commercial transport aircraft at the limits of its flight envelope, away from its design point, requires either expensive flight testing, tests in sophisticated wind tunnel facilities or advanced computational models. As flight tests are very expensive and take place in a late phase during the development of a new aircraft, when most of the design is already fixed, virtual flight tests, which can be performed iteratively during the design process, would be a preferred alternative.

Principal Investigator: Thorsten Lutz, Aircraft Aerodynamics Group, Institute of Aerodynamics and Gas Dynamics, University of Stuttgart (Germany)
HPC Platform: Hazel Hen of HLRS - Date published: October 2017
More: SCBOPT - Shock Control Bump Optimization …

FS3D – A DNS Code for Multiphase Flows

FS3D – A DNS Code for Multiphase Flows

The subject of multiphase flows encompasses many processes in nature and a broad range of engineering applications such as weather forecasting, fuel injection, sprays, and the spreading of substances in agriculture. To investigate these processes the Institute of Aerospace Thermodynamics (ITLR) uses the direct numerical simulation (DNS) in-house code Free Surface 3D (FS3D). The code is continually optimized and expanded with new features and has been in use for more than 20 years. Investigations were performed, for instance, for phase transitions like freezing and evaporation, basic drop and bubble dynamics processes, droplet impacts on a thin film (“splashing”), and primary jet breakup as well as spray simulations, studies involving multiple components, wave breaking processes, and many other applications.

Principal Investigator: Bernhard Weigand, Institute of Aerospace Thermodynamics, University of Stuttgart (Germany)
HPC Platform: Hazel Hen of HLRS - Date published: October 2017
More: FS3D – A DNS Code for Multiphase Flows …

Understanding Aqueous TMAO Solutions at Very High Pressures

Theoretical Infrared Spectroscopy of Solvated Biomolecules from ab initio Molecular Dynamics: Understanding Aqueous TMAO Solutions at Very High Pressures

Organisms which live under extreme conditions have established adaptation mechanisms during their evolution. One such mechanism with enables life under kbar pressures in deep sea habitats is an unusually high concentration of a specific molecule in their blood, namely TMAO (trimethylamine N-oxide). Yet, the so-called piezolytic mechanism which counteracts such high pressure effects within cells is not understood. As a first step, scientists investigated the properties of aqueous TMAO solutions at very high pressure compared to ambient conditions and find significant changes in the hydrogen bonding properties.

Principal Investigator: Dominik Marx, Lehrstuhl für Theoretische Chemie, Ruhr-Universität Bochum (Germany)
HPC Platform: SuperMUC of LRZ - Date published: October 2017
More: Theoretical Infrared Spectroscopy of Solvated Biomolecules from ab initio Molecular Dynamics: Understanding Aqueous TMAO Solutions at Very High Pressures …

Direct Numerical Simulation of Airfoil Acoustics

Direct Numerical Simulation of Airfoil Acoustics

The reduction of aeroacoustic noise emissions from technical systems like wind turbines or airplanes is a today’s key research goal. Understanding the intricate interactions between noise generation and flow field requires the full resolution of all flow features in time and space. Thus, very highly resolved unsteady simulations producing large amounts of data are required to get insight into local noise generation mechanisms and to investigate ideas for reduction. These mechanisms have been investigated by researchers at the University of Stuttgart through direct numerical simulation (DNS) of a generic airfoil configuration on Hazel Hen at HLRS. The results help to understand noise generation from turbulent flows and also serve as a benchmark for future studies.

Principal Investigator: Claus-Dieter Munz, Institute of Aerodynamics and Gas Dynamics, University of Stuttgart (Germany)
HPC Platform: Hazel Hen of HLRS - Date published: October 2017
More: Direct Numerical Simulation of Airfoil Acoustics …

Unveiling the Equation of State of Nuclear 1 Matter with Binary Neutron Stars

Unveiling the Equation of State of Nuclear Matter with Binary Neutron Stars

Leveraging the HPC infrastructure of LRZ, researchers at the Goethe University in Frankfurt/Main employ a series of in-house developed cutting-edge numerical methods to simulate in full general relativity the inspiral, merger, and collapse of neutron stars. The computationally intense, fully parallel simulations incorporate relativistic hydrodynamics, nuclear finite-temperature equations of state, and an approximate treatment of neutrino emission and absorption. The results, obtained by measuring gravitational waves, can provide important information on the properties of matter at nuclear densities.
  
Principal Investigators: Filippo Galeazzi, Luciano Rezzolla, Institute for Theoretical Physics, Goethe University Frankfurt (Germany)
HPC Platform: SuperMUC of LRZ - Date published: September 2017
More: Unveiling the Equation of State of Nuclear Matter with Binary Neutron Stars …

Multi-Physics Earthquake Rupture Simulation on Petascale

Multi-Physics Earthquake Rupture Simulation on Petascale

Understanding the physics of earthquake rupture occurring on multiple scales and at depths that cannot be probed directly is a ‘Grand Challenge’ of Earth sciences. Geophysicists at the Ludwig-Maximilians-Universität use the in-house-developed SeisSol earthquake simulation software to improve fundamental comprehension of earthquake dynamics by numerical simulation of complicated wave and rupture phenomena.
  
Principal Investigators: Dr. Alice-Agnes Gabriel, Prof. Heiner Igel, Department für Geo- und Umweltwissenschaften, Geophysik, Ludwig-Maximilians-Universität München (Germany)
HPC Platform: SuperMUC of LRZ - Date published: September 2017
More: Multi-Physics Earthquake Rupture Simulation on Petascale …

Development of a Coupled Particle-In-Cell & Direct Simulation Monte Carlo Method for the Simulation of Non-Equilibrium Plasma and Gas Flow Applications

Development of a Coupled Particle-In-Cell & Direct Simulation Monte Carlo Method for the Simulation of Non-Equilibrium Plasma and Gas Flow Applications

The Institute of Space Systems (IRS) and the Institute of Aerodynamics and Gas Dynamics (IAG) at the University of Stuttgart cooperatively develop the particle simulation tool "PICLas", a flexible simulation suite for the computation of three-dimensional plasma flows. The tool enables the physically-accurate numerical simulation of non-equilibrium plasma and gas flows. The applications range from the atmospheric entry of spacecraft to laser-plasma interaction in material sciences. The high-fidelity numerical approach allows detailed insights in the physical phenomena and is made feasible by high-performance computing.

Principal InvestigatorInvestigators: Dr.-Ing. Marcel Pfeiffer (IRS), Prof. Dr.-Ing. Stefanos Fasoulas, Prof. Dr. Claus-Dieter Munz (IAG), University of Stuttgart, (Germany)
HPC Platform: Hazel Hen of HLRS - Date published: September 2017
More: Development of a Coupled Particle-In-Cell & Direct Simulation Monte Carlo Method for the Simulation of Non-Equilibrium Plasma and Gas Flow Applications …

4D City − Space-time Urban Infrastructure Mapping by Multi-sensor Fusion and Visualization

4D City − Space-time Urban Infrastructure Mapping by Multi-sensor Fusion and Visualization

Static 3-D city models are well established for many applications such as architecture, urban planning, navigation, tourism, and disaster management. However, they do not represent the dynamic behavior of the buildings and other infrastructure (e.g. dams, bridges, railway lines). Such temporal change, i.e. 4-D, information is demanded in various aspect of urban administration, especially for the long-term monitoring of building deformation. Very high resolution spaceborne Synthetic Aperture Radar (SAR) Earth observation satellites, like the German TerraSAR-X and TanDEM-X provide for the first time the possibility to derive both shape and deformation parameters of urban infrastructure on a continuous basis.

Principal Investigator: Xiaoxiang Zhu, Signal Processing in Earth Observation, Technical University of Munich and Remote Sensing Technology Institute, German Aerospace Center (Germany)
HPC Platform: SuperMUC of LRZ - Date published: August 2017
More: 4D City − Space-time Urban Infrastructure Mapping by Multi-sensor Fusion and Visualization …

Liquid Break-up and Droplet Impact Simulation to Spread High Efficient Rotary Bells in SME Dominated General Industries

Liquid Break-up and Droplet Impact Simulation to Spread High Efficient Rotary Bells in SME Dominated General Industries

Researchers carry out numerical simulations of spray painting processes using a commercial high-speed rotary bell atomizer within the frame of an ongoing project “smart spray painting process”. Using a commercial CFD-code, detailed numerical studies deal with the film formation of the paint liquid on the bell cup, the primary liquid breakup near the bell edge, the paint droplet trajectories, as well as the droplet impact onto solid surface. Simulation results deliver important information for understanding and optimization of the complicated spray painting processes.

Principal Investigators: Qiaoyan Ye and Oliver Tiedje, Fraunhofer Institute for Manufacturing Engineering and Automation, Stuttgart, (Germany)
HPC Platform: Hazel Hen of HLRS - Date published: August 2017
More: Liquid Break-up and Droplet Impact Simulation to Spread High Efficient Rotary Bells in SME Dominated General Industries …

The Beta Function of Strongly Coupled Gauge Theories near the Non-perturbative Conformal Edge

The Beta Function of Strongly Coupled Gauge Theories near the Non-perturbative Conformal Edge

Strongly Coupled Gauge Theories (SCGTs) play an important role in High Energy Physics. Certain SCGTs are nearly conformal, which is a desired property in the search of new physics. The search of such theories requires the study of the beta function. In this project, the Lattice Higgs Collaboration investigates the beta function of SCGTs which are similar to QCD and observed that the beta function decreases with increasing number of fermion flavors. It also provides a quantitative estimate of how close to conformality these theories are, which is crucial in the search of viable models of new physics.
  
Principal Investigator: Chik Him Wong, University of Wuppertal (Germany)
HPC Platform: JUQUEEN of JSC - Date published: July 2017
More: The Beta Function of Strongly Coupled Gauge Theories near the Non-perturbative Conformal Edge …

Atomistic Simulations of Laser Ablation and Radiation Induced Ionization Effects

LASMD: Atomistic Simulations of Laser Ablation and Radiation Induced Ionization Effects

Laser ablation is a technology which gains more an more importance in drilling, eroding, welding, structuring and marking of all kind of materials. The usage of shorter femtosecond laser pulses promises to improve the quality. Molecular dynamics simulations can contribute to new insights into the not completely comprehended ablation process with these short pulses. Researchers of the University of Stuttgart have developed a program package for the atomistic simulation of laser ablation which can deal with the coupling of the laser light, the heat conduction by the electrons, and the effects of a nascent plasma plume.

Principal Investigator: Johannes Roth, Institute for Theoretical and Applied Physics, University of Stuttgart (Germany)
HPC Platform: Hazel Hen of HLRS - Date published: July 2017
More: LASMD: Atomistic Simulations of Laser Ablation and Radiation Induced Ionization Effects …

Computer Simulations of Nucleation Processes in Colloidal Crystals

Computer Simulations of Nucleation Processes in Colloidal Crystals

A team from the physics department of the Johannes Gutenberg University, Mainz, has investigated nucleation processes and interfacial properties of colloidal crystals. Nucleation is omnipresent in our daily life and describes events as diverse as the formation of rain in clouds, the crystallization of proteins or the growth of nano-particles. The studies undertaken using supercomputers Hazel Hen and Hornet of HLRS Stuttgart contribute towards a more fundamental understanding of these processes and the underlying theoretical foundation.

Principal Investigators: Kurt Binder and Peter Virnau, Johannes Gutenberg University, Mainz (Germany)
HPC Platform: Hornet and Hazel Hen of HLRS - Date published: July 2017
More: Computer Simulations of Nucleation Processes in Colloidal Crystals …

Flow Mixing Induced Thermal Fatigue Damage in Power Plant Piping Studied Using HPC

Flow Mixing Induced Thermal Fatigue Damage in Power Plant Piping Studied Using High Performance Computing

Understanding the nature of the turbulent flow mixing behavior in power plants which induce thermal fatigue cracking of components is still an unresolved challenge. Aside from measurements being performed at realistic power plant conditions (e.g. at 8 MPa pressure and temperature difference of 240°C between the mixing fluids) numerical calculations involving high-performance computing could throw more light into the complex fluid flow at any location of interest to investigators. Thus a combination of measurements coupled with numerical calculations could positively contribute towards realistic assessment of thermal fatigue damage induced in power plant components.

Principal Investigator: P. Karthick Selvam, Institute of Nuclear Technology and Energy Systems (IKE), University of Stuttgart (Germany)
HPC Platform: Hazel Hen of HLRS - Date published: July 2017
More: Flow Mixing Induced Thermal Fatigue Damage in Power Plant Piping Studied Using High Performance Computing …

Servicemeu