Results 61 to 70 of about 3,477 (194)

Magnetohydrodynamic simulations of black hole accretion [PDF]

AIP Conference Proceedings, 2001
We discuss the results of three-dimensional magnetohydrodynamic simulations, using a pseudo-Newtonian potential, of thin disk (h/r ~ 0.1) accretion onto black holes. We find (i) that magnetic stresses persist within the marginally stable orbit, and (ii) that the importance of those stresses for the dynamics of the flow depends upon the strength of ...
Reynolds, Christopher S., Armitage, Philip J., Chiang, James   +2 more
openaire   +2 more sources

A Coscaling Grid for Athena++. II. Magnetohydrodynamics

The Astrophysical Journal Supplement Series
We extend the coscaling formalism of Habegger & Heitsch implemented in Athena++ to magnetohydrodynamics. The formalism relies on flow symmetries in astrophysical problems involving expansion, contraction, and center-of-mass motion. The formalism is fully
Fabian Heitsch, Roark Habegger
doaj   +1 more source

Improved Myocardial Sodium Quantification at 7 T Using Interleaved 23Na/1H pTx MRI With Motion and Anatomy‐Based B1 Correction

Magnetic Resonance in Medicine, EarlyView.
ABSTRACT Purpose To improve accuracy and repeatability of myocardial 23Na quantification in cardiac MRI at 7 T by combining retrospective respiratory and cardiac motion correction with a novel anatomy‐based B1 bias field correction. Methods In this study, a dual‐nuclear interleaved 23Na/1H MRI sequence at 7 T was applied.
Laurent Ruck, Nico Egger, Benedikt Zobler, Judith Schirmer, Sophia Nagelstraßer, Andreas Bitz, Tanja Platt, Simon Konstandin, Christoph Kopp, Michael Uder, Armin Michael Nagel   +10 more
wiley   +1 more source

Formation of Plasmoid Chains in Fusion Relevant Plasmas

, 2014
The formation of plasmoid chains is explored for the first time within the context of the Taylor problem, in which magnetic reconnection is driven by a small amplitude boundary perturbation in a tearing-stable slab plasma equilibrium.
Comisso, Luca, Grasso, Daniela, Waelbroeck, François L.   +2 more
core   +1 more source

On Hydrodynamic Motions in Dead Zones [PDF]

, 2009
We investigate fluid motions near the midplane of vertically stratified accretion disks with highly resistive midplanes. In such disks, the magnetorotational instability drives turbulence in thin layers surrounding a resistive, stable dead zone.
Arras, Bai, Balbus, Barranco, Fleming, Jeffrey S. Oishi, Johansen, Johansen, Johansen, Johnson, Johnson, Klahr, Mordecai-Mark Mac Low, Oishi, Petersen, Petersen, Shen, Youdin   +17 more
core   +1 more source

Constraining Circumgalactic Turbulence with QSO Absorption Line Measurements

The Astrophysical Journal, 2023
Our knowledge of the circumgalactic medium (CGM) is mostly based on quasar absorption line measurements. These have uncovered a multiphase medium that is likely highly turbulent, but constraints of this turbulence are limited to measurements of the ...
Brad Koplitz, Edward Buie II, Evan Scannapieco   +2 more
doaj   +1 more source

Actuation Strategies for Underwater Jet‐Propelled Soft Robots

Journal of Field Robotics, EarlyView.
ABSTRACT This review article examines jet‐propulsion mechanisms in underwater soft robotic systems, focusing exclusively on physically fabricated and experimentally validated robots. Covering research published from 2013 to 2025, this study classifies and evaluates jet‐propulsion robots based on their actuation mechanisms.
Angel Kitone, Mohammed Anteet, Pawandeep S. Matharu, Yara Almubarak   +3 more
wiley   +1 more source

Accretion of low angular momentum material onto black holes: 2D magnetohydrodynamical case

, 2003
We report on the second phase of our study of slightly rotating accretion flows onto black holes. We consider magnetohydrodynamical (MHD) accretion flows with a spherically symmetric density distribution at the outer boundary, but with spherical symmetry
Balbus S. A., Bondi H., Daniel Proga, Hawley J. F., Machida M., McKinney J. C., Mitchell C. Begelman, Paczynski B.   +7 more
core   +2 more sources

Magnetohydrodynamic simulation code CANS+: Assessments and applications

Publications of the Astronomical Society of Japan, 2019
Abstract We present a new magnetohydrodynamic (MHD) simulation package with the aim of providing accurate numerical solutions to astrophysical phenomena where discontinuities, shock waves, and turbulence are inherently important. The code implements the Harten–Lax–van Leer–discontinuitues (HLLD) approximate Riemann solver, the fifth ...
Yosuke Matsumoto, Yuta Asahina, Yuki Kudoh, Tomohisa Kawashima, Jin Matsumoto, Hiroyuki R Takahashi, Takashi Minoshima, Seiji Zenitani, Takahiro Miyoshi, Ryoji Matsumoto   +9 more
openaire   +2 more sources

Modelling interplanetary CMEs using magnetohydrodynamic simulations [PDF]

Annales Geophysicae, 2002
Abstract. The dynamics of Interplanetary Coronal Mass Ejections (ICMEs) are discussed from the viewpoint of numerical modelling. Hydrodynamic models are shown to give a good zero-order picture of the plasma properties of ICMEs, but they cannot model the important magnetic field effects.
P. J. Cargill, P. J. Cargill, J. M. Schmidt   +2 more
openaire   +4 more sources