192 citations · 748 across the 25 of their papers we have counts for
27 papers
Massively parallel numerical simulations with Julia
Simon Candelaresi, Benedict Geihe, Marco Artiano +6
The Julia programming language aims to provide a modern approach to develop high-performance computing (HPC) applications. It tries to achieve this by combining a high-level, dynam…
Adaptive Multiphysics Coupling for Hyperbolic Systems
Simon Candelaresi, Erik Faulhaber, Michael Schlottke-Lakemper
For the discontinuous Galerkin code Trixijl we implement capabilities for adaptively coupling arbitrarily many domains with different physics. The coupling of the systems is rea…
Twisted Magnetic Knots and Links
Simon Candelaresi, Celine Beck
For magnetic knots and links in plasmas we introduce an internal twist and study their dynamical behavior in numerical simulations. We use a set of helical and non-helical configur…
On self and mutual winding helicity
Simon Candelaresi, Gunnar Hornig, David MacTaggart +1
The topological underpinning of magnetic fields connected to a planar boundary is naturally described by field line winding. This observation leads to the definition of winding hel…
The Pencil Code, a modular MPI code for partial differential equations and particles: multipurpose and multiuser-maintained
A. Brandenburg, A. Johansen, P. A. Bourdin +34
The Pencil Code is a highly modular physics-oriented simulation code that can be adapted to a wide range of applications. It is primarily designed to solve partial differential equ…
Stabilizing effect of magnetic helicity on magnetic cavities in the intergalactic medium
Simon Candelaresi, Fabio Del Sordo
We investigate the effect of magnetic helicity on the stability of buoyant magnetic cavities as found in the intergalactic medium. In these cavities, we insert helical magnetic fie…
Is there a left-handed magnetic field in the solar neighborhood? Exploring helical magnetic fields in the interstellar medium through dust polarization power spectra
Andrea Bracco, Simon Candelaresi, Fabio Del Sordo +1
The full-sky Planck polarization data at 850um revealed unexpected properties of the E and B mode power spectra of dust emission in the interstellar medium (ISM). The positive cros…
Minimum Quadratic Helicity States
Petr M. Akhmet'ev, Simon Candelaresi, Alexandr Yu Smirnov
Building on previous results on the quadratic helicity in magnetohydrodynamics (MHD) we investigate particular minimum helicity states. Those are eigenfunctions of the curl operato…
Estimating the rate of field line braiding in the solar corona by photospheric flows
Simon Candelaresi, David Pontin, Anthony Yeates +2
In this paper we seek to understand the timescale on which the photospheric motions on the Sun braid coronal magnetic field lines. This is a crucial ingredient for determining the…
Calculations for the Practical Applications of Quadratic Helicity in MHD
Petr M. Akhmet'ev, Simon Candelaresi, Alexandr Yu Smirnov
For the quadratic helicity we present a generalization of the Arnol'd inequality which relates the magnetic energy to the quadratic helicity, which poses a lower bound. W…
Quantifying the Tangling of Trajectories Using the Topological Entropy
Simon Candelaresi, David Ian Pontin, Gunnar Hornig
We present a simple method to efficiently compute a lower limit of the topological entropy and its spatial distribution for two-dimensional mappings. These mappings could represent…
Effects of Fieldline Topology on Energy Propagation in the Corona
Simon Candelaresi, David Ian Pontin, Gunnar Hornig
We study the effect of photospheric footpoint motions on magnetic field structures containing magnetic nulls. The footpoint motions are prescribed on the photospheric boundary as a…
Ideal Relaxation of the Hopf Fibration
Christopher Berg Smiet, Simon Candelaresi, Dirk Bouwmeester
Ideal MHD relaxation is the topology-conserving reconfiguration of a magnetic field into a lower energy state where the net force is zero. This is achieved by modeling the plasma a…
Braided magnetic fields: equilibria, relaxation and heating
D. I. Pontin, S. Candelaresi, A. J. B. Russell +1
We examine the dynamics of magnetic flux tubes containing non-trivial field line braiding (or linkage), using mathematical and computational modelling, in the context of testable p…
Self-organizing Knotted Magnetic Structures in Plasma
C. B. Smiet, S. Candelaresi, A. Thompson +3
We perform full-MHD simulations on various initially helical configurations and show that they reconfigure into a state where the magnetic field lines span nested toroidal surfaces…
Superflare occurrence and energies on G-, K- and M-type dwarfs
Simon Candelaresi, Andrew Hillier, Hiroyuki Maehara +2
Kepler data from G-, K- and M-type stars are used to study conditions that lead to superflares with energies above . From the 117,661 stars included, 380 show su…
The kinetic helicity needed to drive large-scale dynamos
Simon Candelaresi, Axel Brandenburg
Magnetic field generation on scales large compared with the scale of the turbulent eddies is known to be possible via the so-called effect when the turbulence is helical and if…
Excess Wings in Broadband Dielectric Spectroscopy
Simon Candelaresi, Rudolf Hilfer
Analysis of excess wings in broadband dielectric spectroscopy data of glass forming materials is found to provide evidence for anomalous time evolutions and fractional semigroups.…
Magnetic helicity fluxes and their effect on stellar dynamos
Simon Candelaresi, Axel Brandenburg
Magnetic helicity fluxes in turbulently driven alpha^2 dynamos are studied to demonstrate their ability to alleviate catastrophic quenching. A one-dimensional mean-field formalism…
Decay of helical and non-helical magnetic knots
Simon Candelaresi, Axel Brandenburg
We present calculations of the relaxation of magnetic field structures that have the shape of particular knots and links. A set of helical magnetic flux configurations is considere…
Magnetic helicity fluxes in alpha Omega dynamos
Simon Candelaresi, Axel Brandenburg
In turbulent dynamos the production of large-scale magnetic fields is accompanied by a separation of magnetic helicity in scale. The large- and small-scale parts increase in magnit…
Decay of trefoil and other magnetic knots
Simon Candelaresi, Fabio Del Sordo, Axel Brandenburg
Two setups with interlocked magnetic flux tubes are used to study the evolution of magnetic energy and helicity on magnetohydrodynamical (MHD) systems like plasmas. In one setup th…
Magnetic helicity transport in the advective gauge family
Simon Candelaresi, Alexander Hubbard, Axel Brandenburg +1
Magnetic helicity fluxes are investigated in a family of gauges in which the contribution from ideal magnetohydrodynamics takes the form of a purely advective flux. Numerical simul…
Influence of Magnetic Helicity in MHD
Simon Candelaresi, Fabio Del Sordo, Axel Brandenburg
Observations have shown that the Sun's magnetic field has helical structures. The helicity content in magnetic field configurations is a crucial constraint on the dynamical evoluti…