1,911 Hits in 4.9 sec

Introducing ZEUS-MP: A 3D, Parallel, Multiphysics Code for Astrophysical Fluid Dynamics [article]

Michael L. Norman
2000 arXiv   pre-print
ZEUS-MP is a follow-on to the sequential ZEUS-2D and ZEUS-3D codes developed and disseminated by the Laboratory for Computational Astrophysics ( at NCSA.  ...  Some parallel performance results are presented as well as an application to turbulent star formation.  ...  Also available is a new 3D visualization tool called LCA Vision∼miksa/LCAVision1.0.html.  ... 
arXiv:astro-ph/0005109v1 fatcat:fco6uups2najhhhklajkzbekgq

Visualizing the world's largest turbulence simulation [article]

Salvatore Cielo, Luigi Iapichino, Johannes Günther, Christoph Federrath, Elisabeth Mayer, Markus Wiedemann
2019 arXiv   pre-print
In this exploratory submission we present the visualization of the largest interstellar turbulence simulations ever performed, unravelling key astrophysical processes concerning the formation of stars  ...  Besides revealing features of turbulence with an unprecedented resolution, the visualizations brilliantly showcase the stretching-and-folding mechanisms through which astrophysical processes such as supernova  ...  and astrophysics.  ... 
arXiv:1910.07850v1 fatcat:fc6pt5jjs5he5cxkp2554t7iry

Visualization of Large Scientific Datasets - Analysis of Numerical Simulation Data and Astronomical Surveys Catalogues

Bruno Thooris, Daniel Pomarède
2015 Proceedings of the 6th International Conference on Information Visualization Theory and Applications  
Recently, the SDvision 3D visualization software has been improved to cope with the analysis of astronomical surveys catalogues, databases of multiple data products including redshifts, peculiar velocities  ...  We present in this paper the SDvision code capabilities with examples of visualization of cosmology and astrophysical simulations realized with hydrodynamics codes, and more results in other domains of  ...  Figure 1 : 1 the SDvision interface used to visualize a MHD simulation of turbulences in the convection zone of the Sun.  ... 
doi:10.5220/0005300901170122 dblp:conf/grapp/ThoorisP15 fatcat:nos644ailjfbhpl3qxtbgqhkoi


Shiva Kumar Malapaka, Wolf-Christian Müller
2013 Astrophysical Journal  
The inverse cascade of magnetic helicity in 3D-MHD turbulence is believed to be one of the processes responsible for large scale magnetic structure formation in astrophysical systems.  ...  In this work we present an exhaustive set of high resolution direct numerical simulations (DNS) of both forced and decaying 3D-MHD turbulence, to understand this structure formation process.  ...  CONCLUSIONS A set of homogeneous forced and decaying 3D-MHD turbulence simulations were conducted.  ... 
doi:10.1088/0004-637x/778/1/21 fatcat:izqgsy2nsfa5fafvfeyqsukt6y

Diagnosing Turbulence in the Neutral and Molecular Interstellar Medium of Galaxies [article]

Blakesley Burkhart
2021 arXiv   pre-print
In this review article we address the growing importance of MHD turbulence in many fields of astrophysics and review statistical diagnostics for studying interstellar and interplanetary turbulence.  ...  We conclude by describing several open-source tools for the astrophysical community to use when dealing with turbulence.  ...  MHD scalings critically inform on how turbulence affects various astrophysical applications.  ... 
arXiv:2106.02239v1 fatcat:rfs4cc3hyrgd7gsqctvtnpqsem

Measurement of MHD turbulence properties by synchrotron radiation techniques [article]

Jianfu Zhang
2022 arXiv   pre-print
It is well-known that magnetohydrodynamic (MHD) turbulence is ubiquitous in astrophysical environments.  ...  The correct understanding of the fundamental properties of MHD turbulence is a prerequisite for revealing many key astrophysical processes.  ...  FUNDAMENTALS OF MHD TURBULENCE THEORY Turbulence driving mechanism The turbulence energy source driving varies with different astrophysical environments.  ... 
arXiv:2203.09154v1 fatcat:qpa4qkassvcdbb3djs6m57y6cq

Measurement of MHD Turbulence Properties by Synchrotron Radiation Techniques

Jian-Fu Zhang, Ru-Yue Wang
2022 Frontiers in Astronomy and Space Sciences  
It is well known that magnetohydrodynamic (MHD) turbulence is ubiquitous in astrophysical environments.  ...  The correct understanding of the fundamental properties of MHD turbulence is a pre-requisite for revealing many key astrophysical processes.  ...  FUNDAMENTALS OF MHD TURBULENCE THEORY Turbulence Driving Mechanism The turbulence energy source driving varies with different astrophysical environments.  ... 
doi:10.3389/fspas.2022.869370 fatcat:bvxtau4tc5bxtcodrrvjksvgmq

3D turbulent reconnection: Theory, tests, and astrophysical implications

Alex Lazarian, Gregory L. Eyink, Amir Jafari, Grzegorz Kowal, Hui Li, Siyao Xu, Ethan T. Vishniac
2020 Physics of Plasmas  
Astrophysical flows normally have very large Reynolds numbers and are expected to be turbulent, in agreement with observations.  ...  We show that turbulent reconnection dramatically affects the key astrophysical processes, e.g., star formation, turbulent dynamo, acceleration of cosmic rays.  ...  Turbulence makes the 2D and 3D even more different as the nature of MHD turbulence in 3D is very different.  ... 
doi:10.1063/1.5110603 fatcat:hfhaule6o5h3jkm3rpkypyhwiy

The Catalogue for Astrophysical Turbulence Simulations (CATS) [article]

B. Burkhart, S. Appel, S. Bialy, J. Cho, A. J. Christensen, D. Collins, C. Federrath, D. Fielding, D. Finkbeiner, A. S. Hill, J. C. Ibanez-Mejia, M. R. Krumholz (+9 others)
2020 arXiv   pre-print
Turbulence is a key process in many fields of astrophysics.  ...  CATS includes magnetohydrodynamic (MHD) turbulent box simulation data products generated by the public codes athena++, arepo, enzo, and flash.  ...  In this paper we present a new repository for MHD astrophysical turbulence simulations: The Catalogue for Astrophysical Turbulence Simulations (CATS).  ... 
arXiv:2010.11227v1 fatcat:wbyte7xoerfzfglsxnmasvtgie

Relation of astrophysical turbulence and magnetic reconnection

A. Lazarian, Gregory L. Eyink, E. T. Vishniac
2012 Physics of Plasmas  
Astrophysical fluids are generically turbulent and this must be taken into account for most transport processes.  ...  We show the intrinsic interdependence and interrelation of magnetic turbulence and magnetic reconnection, in particular, that strong magnetic turbulence in 3D requires reconnection and 3D magnetic turbulence  ...  of 3D turbulence.  ... 
doi:10.1063/1.3672516 fatcat:niuygksfcbgrdegjugoqeutgy4

Theory and Applications of Non-relativistic and Relativistic Turbulent Reconnection [chapter]

A. Lazarian, G. Kowal, M. Takamoto, E. M. de Gouveia Dal Pino, J. Cho
2016 Astrophysics and Space Science Library  
Realistic astrophysical environments are turbulent due to the extremely high Reynolds numbers.  ...  We stress that not only astrophysical turbulence is ubiquitous, but also magnetic reconnection itself induces turbulence.  ...  Theory of weak and strong MHD turbulence MHD theory is applicable to astrophysical plasmas at sufficiently large scales and for many astrophysical situations the Alfvénic turbulence, which is the most  ... 
doi:10.1007/978-3-319-26432-5_11 fatcat:3wh6n73hxrfi7gaj2l74htuxdi


R. Santos-Lima, E. M. de Gouveia Dal Pino, A. Lazarian
2012 Astrophysical Journal  
By means 3D MHD simulations, we show that this mechanism is able to transport magnetic flux to the outskirts of the disk progenitor at time scales compatible with the collapse, allowing the formation of  ...  Since MHD turbulence is expected to be present in protostellar disks, this is a natural mechanism for removing magnetic flux excess and allowing the formation of these disks.  ...  In order to compare our turbulent MHD model with other rotating disk formation models, we also performed 3D simulations of a pure hydrodynamical, an ideal MHD and a resistive MHD model with a hyper-resistivity  ... 
doi:10.1088/0004-637x/747/1/21 fatcat:rbhmhii6xjfdth2fp4irg36hqi

Magnetic Reconnection in Astrophysical Environments [chapter]

Alex Lazarian, Gregory L. Eyink, Ethan T. Vishniac, Grzegorz Kowal
2014 Astrophysics and Space Science Library  
We consider magnetic reconnection in realistic 3D geometry in the presence of turbulence.  ...  We show that the predicted dependences of the reconnection rates on the level of MHD turbulence make the generally accepted Goldreich \& Sridhar (1995) model of turbulence self-consistent.  ...  The research is supported by the Center for Magnetic Self-Organization in Laboratory and Astrophysical Plasmas.  ... 
doi:10.1007/978-3-662-44625-6_12 fatcat:i7mjvo4fajfahjc6x3jnp3vdqi

Finite dissipation and intermittency in magnetohydrodynamics

P. D. Mininni, A. Pouquet
2009 Physical Review E  
We present an analysis of data stemming from numerical simulations of decaying magnetohydrodynamic (MHD) turbulence up to grid resolution of 1536^3 points and up to Taylor Reynolds number of 1200.  ...  Furthermore, intermittency of MHD flows, as determined by the spectrum of anomalous exponents of structure functions of the velocity and the magnetic field, is stronger than for fluids, confirming earlier  ...  Mathematically, this is an open problem in 3D for fluids and MHD, and yet it is central for astrophysics where dissipative structures, reconnection and acceleration of particles are well observed [4]  ... 
doi:10.1103/physreve.80.025401 pmid:19792189 fatcat:cjk2tvip2jhxblh7jtzxwnwnei

Reconnection in turbulent astrophysical fluids [article]

A. Lazarian, G. Eyink, E. Vishniac, G. Kowal
2014 arXiv   pre-print
We analyze the connection of this process with turbulence which is ubiquitous in astrophysical environments.  ...  In particular, magnetic reconnection can initially develop through tearing, but the transition to the turbulent state is expected for astrophysical systems.  ...  The research is supported by the Center for Magnetic Self-Organization in Laboratory and Astrophysical Plasmas. G.K. acknowledges support from FAPESP (projects no. 2013/04073-2 and 2013/18815-0).  ... 
arXiv:1408.3134v1 fatcat:l6k4nwxqxve3xms7bjnd2nbx2u
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