A5030838585- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Star Formation Studies
- Gamma-ray bursts and supernovae
- Astronomy and Astrophysical Research
- Advanced Data Storage Technologies
- Computational Physics and Python Applications
- Fluid Dynamics and Turbulent Flows
- Parallel Computing and Optimization Techniques
- Astro and Planetary Science
- Astrophysics and Cosmic Phenomena
- Distributed and Parallel Computing Systems
- Meteorological Phenomena and Simulations
- Quantum Computing Algorithms and Architecture
- Radio Astronomy Observations and Technology
- Cosmology and Gravitation Theories
- Computational Fluid Dynamics and Aerodynamics
- Solar and Space Plasma Dynamics
- Quantum Information and Cryptography
- Lattice Boltzmann Simulation Studies
- Magnetic confinement fusion research
- Algorithms and Data Compression
- Scientific Computing and Data Management
- Plant Water Relations and Carbon Dynamics
- Nuclear Physics and Applications
- Adaptive optics and wavefront sensing
Leibniz Supercomputing Centre
2014-2024
Bavarian Academy of Sciences and Humanities
2017-2024
Isotopen Technologien München (Germany)
2021
Heidelberg University
2010-2017
University of Würzburg
2008
Max Planck Institute for Astrophysics
2004-2006
Max Planck Society
2004-2006
We performed a set of cosmological simulations major mergers in galaxy clusters to study the evolution merger shocks and subsequent injection turbulence post-shock region intra-cluster medium (ICM). The computations were done with grid-based, adaptive mesh refinement hydro code Enzo, using an especially designed criteria for refining turbulent flows vicinity shocks. A substantial amount energy is injected ICM due merger. Our show that shock launched after develops ellipsoidal shape gets...
The development of turbulent gas flows in the intra-cluster medium and core a galaxy cluster is studied by means adaptive mesh refinement (AMR) cosmological simulations. A series six runs was performed, employing identical simulation parameters but different criteria for triggering refinement. In particular, two AMR strategies were followed, based on regional variability control variables flow overdensity subclumps, respectively. We show that both approaches, albeit with results, are useful...
The injection and evolution of turbulence in the intergalactic medium is studied by means mesh-based hydrodynamical simulations, including a subgrid-scale (SGS) model for small-scale unresolved turbulence. simulations show that production has different redshift dependence intracluster (ICM) warm-hot (WHIM). We ICM produced chiefly merger-induced shear flows, whereas WHIM dominated shock interactions. Secondly, effect dynamical pressure support on gravitational contraction been studied. This...
We present a numerical scheme for modelling unresolved turbulence in cosmological adaptive mesh refinement codes.As first application, we study the evolution of intra-cluster medium and core galaxy cluster.Simulations with without subgrid scale model are compared detail.Since flow ICM is subsonic, global turbulent energy contribution at length scales smaller than 1% internal energy.We find that production closely correlated merger events occurring cluster environment, its dissipation locally...
Merger shocks induce turbulence in the intracluster medium (ICM), and, under some circumstances, accelerate electrons to relativistic velocities form so-called radio relics. Relics are mostly found at periphery of galaxy clusters and appear have magnetic fields μ G level. Here we investigate possible origins these fields. Turbulence produced by shock itself cannot explain magnitude However, argue that if turbulent pressure support ICM upstream merger is order 10–30 per cent total on scales a...
Abstract Most heritable diseases are polygenic. To comprehend the underlying genetic architecture, it is crucial to discover clinically relevant epistatic interactions (EIs) between genomic single nucleotide polymorphisms (SNPs) (1–3). Existing statistical computational methods for EI detection mostly limited pairs of SNPs due combinatorial explosion higher-order EIs. With NeEDL (network-based epistasis via local search), we leverage network medicine inform selection EIs that an order...
Adaptation to climate change requires robust projections, yet the uncertainty in these projections performed by ensembles of Earth system models (ESMs) remains large. This is mainly due uncertainties representation subgrid-scale processes such as turbulence or convection that are partly alleviated at higher resolution. New developments machine learning-based hybrid ESMs demonstrate great potential for systematically reduced errors compared traditional ESMs. Building on work (physics + AI)...
The outskirts of galaxy clusters are characterized by the interplay gas accretion and dynamical evolution involving turbulence, shocks, magnetic fields diffuse radio emission. density velocity structure in provide an effective pressure support affect all processes listed above. Therefore, it is important to resolve properly model turbulent flow these mildly overdense relatively large cluster regions; this a challenging task for hydrodynamical codes. In work, grid-based simulations presented....
The problem of the resolution turbulent flows in adaptive mesh refinement (AMR) simulations is investigated by means 3D hydrodynamical an idealised setup, representing a moving subcluster during merger event. AMR performed with usual criteria based on local gradients selected variables do not properly resolve production turbulence downstream cluster. Therefore we apply novel which are optimised to follow evolution flow. We demonstrate that these provide better flow past subcluster, allowing...
The injection of turbulence in the circum-galactic medium at redshift z = 2 is investigated using mesh-based hydrodynamic code Enzo and a subgrid-scale (SGS) model for unresolved turbulence. Radiative cooling heating by uniform Ultraviolet (UV) background are included our runs compared with effect modelling. Mechanisms gas exchange between galaxies surrounding medium, as well metal enrichment, not taken into account, here driven solely structure formation (mergers shocks). We find that...
The Square Kilometre Array (SKA) is the most ambitious radio telescope ever planned. With a collecting area of about square kilometre, SKA will be far superior in sensitivity and observing speed to all current facilities. scientific capability promised by its technological challenges provide an ideal base for interdisciplinary research, technology transfer, collaboration between universities, research centres industry. regime European Extreme Large Telescope (E-ELT) optical band are on...
Galaxy clusters are unique laboratories to investigate turbulent fluid motions and large scale magnetic fields.Synchrotron radio halos at the center of merging galaxy provide most spectacular direct evidence presence relativistic particles fields associated with intracluster medium.The study polarized emission from is extremely important constrain properties physics acceleration transport particles.However, detecting this signal a very hard task current facilities.We use cosmological...
In the framework of Chandrasekhar-mass deflagration model for type Ia supernovae (SNe Ia), a persisting free parameter is initial morphology flame front, which linked to ignition process in progenitor white dwarf. Previous analytical models indicate that thermal runaway driven by temperature perturbations (“bubbles”) develop dwarf's convective core. order probe conditions at (diameters, temperatures, and evolutionary timescales), we performed hydrodynamical 2D simulations buoyant bubbles...
ABSTRACT Galaxy clusters are known to be reservoirs of cosmic rays (CRs), as inferred from theoretical calculations or detection CR-derived observables. CR acceleration in is mostly attributed the dynamical activity that produces shocks. Shocks emerge out merger accretion, but which one more effective producing CRs? at phase? and why? To this aim, we study production injection CRs through shocks its evolution galaxy using cosmological simulations with enzo code. Particle model considered...
<i>Context. <i/>It is widely accepted that the onset of explosive carbon burning in core a carbon-oxygen white dwarf (CO WD) triggers ignition type Ia supernova (SN Ia). The features are among few free parameters SN explosion theory.<i>Aims. <i/>We explore role for process two different issues: firstly, studied WD models coming from accretion histories. Secondly, we estimate how reaction rate C-burning can affect ignition.<i>Methods. <i/>Two-dimensional hydrodynamical simulations temperature...
Tensor network methods are incredibly effective for simulating quantum circuits. This is due to their ability efficiently represent and manipulate the wave-functions of large interacting systems. We describe challenges faced when scaling tensor simulation approaches Exascale compute platforms introduce QuantEx, a framework circuit at Exascale.
Galaxy clusters are unique laboratories to investigate turbulent fluid motions and large scale magnetic fields. Synchrotron radio halos at the center of merging galaxy provide most spectacular direct evidence presence relativistic particles fields associated with intracluster medium. The study polarized emission from is extremely important constrain properties physics acceleration transport particles. However, detecting this signal a very hard task current facilities.We use cosmological...
Understanding turbulence is critical for a wide range of terrestrial and astrophysical applications. Here we present first results the world's highest-resolution simulation ever done. The current has grid resolution 10048^3 points was performed on 65536 compute cores SuperMUC at Leibniz Supercomputing Centre (LRZ). We scaling test our modified version FLASH code, which updates hydrodynamical equations in less than 3 micro seconds per cell time step. A look column density structure presented...
We describe a strategy for code modernisation of Gadget, widely used community computational astrophysics. The focus this work is on node-level performance optimisation, targeting current multi/many-core IntelR architectures. identify and isolate sample kernel, which representative typical Smoothed Particle Hydrodynamics (SPH) algorithm. modifications include threading parallelism change the data layout into Structure Arrays (SoA), auto-vectorisation algorithmic improvements in particle...
QXTools is a framework for simulating quantum circuits using tensor network methods.Weak simulation the primary use case where given circuit and input state will efficiently calculate probability amplitude of output configuration or set configurations.Given this ability one can sample from distribution random sampling approaches.QXTools intended to be used by researchers interested in larger than those possible with full wave-function simulators research development methods.See Brennan et...
In spring 2015, the Leibniz Supercomputing Centre (Leibniz-Rechenzentrum, LRZ), installed their new Peta-Scale System SuperMUC Phase2. Selected users were invited for a 28 day extreme scale-out block operation during which they allowed to use full system applications. The following projects participated in workshop: BQCD (Quantum Physics), SeisSol (Geophysics, Seismics), GPI-2/GASPI (Toolkit HPC), Seven-League Hydro (Astrophysics), ILBDC (Lattice Boltzmann CFD), Iphigenie (Molecular...