Philipp Grete
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View article: The XMAGNET Exascale MHD Simulations of SMBH Feedback in Galaxy Groups and Clusters: Overview and Preliminary Cluster Results
The XMAGNET Exascale MHD Simulations of SMBH Feedback in Galaxy Groups and Clusters: Overview and Preliminary Cluster Results Open
We present initial results from extremely well-resolved 3D magnetohydrodynamical simulations of idealized galaxy clusters, conducted using the AthenaPK code on the Frontier exascale supercomputer. These simulations explore the self-regulat…
View article: Self-Similar Cosmic-Ray Transport in High-Resolution Magnetohydrodynamic Turbulence
Self-Similar Cosmic-Ray Transport in High-Resolution Magnetohydrodynamic Turbulence Open
We study the propagation of cosmic rays (CRs) through a simulation of magnetohydrodynamic (MHD) turbulence at unprecedented resolution of $10{,}240^3$. We drive turbulence that is subsonic and super-Alfvénic, characterized by $δB_{\rm rms}…
View article: The Density Distribution of Compressively Forced, Supersonic Turbulence Depends on the Driving Correlation Time
The Density Distribution of Compressively Forced, Supersonic Turbulence Depends on the Driving Correlation Time Open
Supersonic turbulence plays a critical role in shaping astrophysical systems, from molecular clouds to the circumgalactic medium. Key properties of this turbulence include the Mach number, driving scale, and nature of the driving mechanism…
View article: The Density Distribution of Compressively-Forced Supersonic Turbulence Depends on the Driving Correlation Time
The Density Distribution of Compressively-Forced Supersonic Turbulence Depends on the Driving Correlation Time Open
Supersonic turbulence plays a critical role in shaping astrophysical systems, from molecular clouds to the circumgalactic medium. Key properties of this turbulence include the Mach number, driving scale, and nature of the driving mechanism…
View article: XMAGNET: Velocity structure functions of active galactic nucleus-driven turbulence in the multiphase intracluster medium
XMAGNET: Velocity structure functions of active galactic nucleus-driven turbulence in the multiphase intracluster medium Open
Context. Significant theoretical and observational efforts are underway to investigate the properties of the turbulence in the hot plasma that pervades galaxy clusters. Spectroscopy has been used to study the projected line-of-sight veloci…
View article: The XMAGNET exascale MHD simulations of SMBH feedback in galaxy groups and clusters: Overview and preliminary cluster results
The XMAGNET exascale MHD simulations of SMBH feedback in galaxy groups and clusters: Overview and preliminary cluster results Open
We present initial results from extremely well-resolved 3D magnetohydrodynamical simulations of idealized galaxy clusters, conducted using the AthenaPK code on the Frontier exascale supercomputer. These simulations explore the self-regulat…
View article: The properties of magnetised cold filaments in a cool-core galaxy cluster <i>(Corrigendum)</i>
The properties of magnetised cold filaments in a cool-core galaxy cluster <i>(Corrigendum)</i> Open
View article: Parthenon
Parthenon Open
View article: The properties of magnetised cold filaments in a cool-core galaxy cluster
The properties of magnetised cold filaments in a cool-core galaxy cluster Open
Context. Filaments of cold gas ( T ≤ 10 4 K) are found in the inner regions of many cool-core clusters. These structures are thought to play a major role in the regulation of feedback from active galactic nuclei (AGNs). Aims. We study the …
View article: Exascale Simulations of Magnetized AGN Feedback
Exascale Simulations of Magnetized AGN Feedback Open
View article: Parthenon: Adaptive Mesh Refinement for Exascale Astrophysics
Parthenon: Adaptive Mesh Refinement for Exascale Astrophysics Open
View article: AthenaK: A Performance-Portable Version of the Athena++ AMR Framework
AthenaK: A Performance-Portable Version of the Athena++ AMR Framework Open
We describe AthenaK: a new implementation of the Athena++ block-based adaptive mesh refinement (AMR) framework using the Kokkos programming model. Finite volume methods for Newtonian, special relativistic (SR), and general relativistic (GR…
View article: The properties of magnetised cold filaments in a cool-core galaxy cluster
The properties of magnetised cold filaments in a cool-core galaxy cluster Open
Filaments of cold gas ($T\leq 10^{4}$ K) are found in the inner regions of many cool-core clusters. These structures are thought to play a major role in the regulation of feedback from active galactic nuclei (AGN). We study the morphology …
View article: Early experiences on the OLCF Frontier system with AthenaPK and Parthenon‐Hydro
Early experiences on the OLCF Frontier system with AthenaPK and Parthenon‐Hydro Open
Summary The Oak Ridge Leadership Computing Facility (OLCF) has been preparing the nation's first exascale system, Frontier, for production and end users. Frontier is based on HPE Cray's new EX architecture and Slingshot interconnect and fe…
View article: Developing Exascale Simulations of Galaxies, Galaxy Groups, and Galaxy Clusters
Developing Exascale Simulations of Galaxies, Galaxy Groups, and Galaxy Clusters Open
View article: Magnetic field amplification in massive primordial halos
Magnetic field amplification in massive primordial halos Open
Context. The potential importance of magnetic fields during structure formation and gravitational collapse in the early Universe has been shown in several studies. In particular, magnetic field amplification by the small-scale dynamo plays…
View article: Magnetic field amplification in massive primordial halos: Influence of Lyman-Werner radiation
Magnetic field amplification in massive primordial halos: Influence of Lyman-Werner radiation Open
The potential importance of magnetic fields during structure formation and gravitational collapse in the early Universe has been shown in several studies. In particular, magnetic field amplification by the small-scale dynamo plays an impor…
View article: Frontier: Exploring Exascale
Frontier: Exploring Exascale Open
As the US Department of Energy (DOE) computing facilities began deploying petascale systems in 2008, DOE was already setting its sights on exascale. In that year, DARPA published a report on the feasibility of reaching exascale. The report…
View article: The Launching of Cold Clouds by Galaxy Outflows. V. The Role of Anisotropic Thermal Conduction
The Launching of Cold Clouds by Galaxy Outflows. V. The Role of Anisotropic Thermal Conduction Open
Motivated by observations of multiphase galaxy outflows, we explore the impact of isotropic and anisotropic electron thermal conduction on the evolution of radiatively cooled, cold clouds embedded in hot, magnetized winds. Using the adapti…
View article: A morphological analysis of the substructures in radio relics
A morphological analysis of the substructures in radio relics Open
Recent observations of radio relics - diffuse radio emission in galaxy clusters - have revealed that these sources are not smooth but consist of structures in the form of threads and filaments. We investigate the origin of these filamentar…
View article: As a Matter of Dynamical Range – Scale Dependent Energy Dynamics in MHD Turbulence
As a Matter of Dynamical Range – Scale Dependent Energy Dynamics in MHD Turbulence Open
Magnetized turbulence is ubiquitous in many astrophysical and terrestrial plasmas but no universal theory exists. Even the detailed energy dynamics in magnetohydrodynamic (MHD) turbulence are still not well understood. We present a suite o…
View article: Parthenon—a performance portable block-structured adaptive mesh refinement framework
Parthenon—a performance portable block-structured adaptive mesh refinement framework Open
On the path to exascale the landscape of computer device architectures and corresponding programming models has become much more diverse. While various low-level performance portable programming models are available, support at the applica…
View article: As a matter of dynamical range -- scale dependent energy dynamics in MHD turbulence
As a matter of dynamical range -- scale dependent energy dynamics in MHD turbulence Open
Magnetized turbulence is ubiquitous in many astrophysical and terrestrial plasmas but no universal theory exists. Even the detailed energy dynamics in magnetohydrodynamic (MHD) turbulence are still not well understood. We present a suite o…
View article: Parthenon -- a performance portable block-structured adaptive mesh refinement framework
Parthenon -- a performance portable block-structured adaptive mesh refinement framework Open
On the path to exascale the landscape of computer device architectures and corresponding programming models has become much more diverse. While various low-level performance portable programming models are available, support at the applica…
View article: Turbulence in the intragroup and circumgalactic medium
Turbulence in the intragroup and circumgalactic medium Open
Context. In massive objects, such as galaxy clusters, the turbulent velocity dispersion, σ turb , is tightly correlated to both the object mass, M , and the thermal energy. Aims. Here, we investigate whether these scaling laws extend to lo…
View article: Magnetized decaying turbulence in the weakly compressible Taylor-Green vortex
Magnetized decaying turbulence in the weakly compressible Taylor-Green vortex Open
Magnetohydrodynamic (MHD) turbulence affects both terrestrial and astrophysical plasmas. The properties of magnetized turbulence must be better understood to more accurately characterize these systems. This work presents ideal MHD simulati…
View article: PERFORMANCE PORTABLE FINITE VOLUME MAGNETOHYDRODYNAMICS FOR THE EXASCALE ERA.
PERFORMANCE PORTABLE FINITE VOLUME MAGNETOHYDRODYNAMICS FOR THE EXASCALE ERA. Open
View article: K-Athena: A Performance Portable Structured Grid Finite Volume Magnetohydrodynamics Code
K-Athena: A Performance Portable Structured Grid Finite Volume Magnetohydrodynamics Code Open
Large scale simulations are a key pillar of modern research and require ever-increasing computational resources. Different novel manycore architectures have emerged in recent years on the way towards the exascale era. Performance portabili…
View article: Kinetic and internal energy transfer in implicit large-eddy simulations of forced compressible turbulence
Kinetic and internal energy transfer in implicit large-eddy simulations of forced compressible turbulence Open
We revisit the problem of how energy transfer through the turbulent cascade operates in compressible hydrodynamic turbulence. In general, there is no conservative compressible cascade since the kinetic and internal energy reservoirs can ex…
View article: ENZO: An Adaptive Mesh Refinement Code for Astrophysics (Version 2.6)
ENZO: An Adaptive Mesh Refinement Code for Astrophysics (Version 2.6) Open
Enzo (Enzo Developers, 2019a) is a block-structured adaptive mesh refinement code that is widely used to simulate astrophysical fluid flows (primarily, but not exclusively, cosmological structure formation, star formation, and turbulence).…