Living reviews in computational astrophysics最新文献_第2页

Modeling cosmic reionization 模拟宇宙再电离

Living reviews in computational astrophysics Pub Date : 2022-08-03 DOI: 10.1007/s41115-022-00015-5

N. Gnedin, P. Madau

引用次数: 3

Well-balanced methods for computational astrophysics. 计算天体物理学的平衡方法。

Living reviews in computational astrophysics Pub Date : 2022-01-01 DOI: 10.1007/s41115-022-00014-6

Roger Käppeli

引用次数: 4

Simulations of cosmic ray propagation. 宇宙射线传播的模拟。

Living reviews in computational astrophysics Pub Date : 2021-01-01 Epub Date: 2021-07-26 DOI: 10.1007/s41115-021-00011-1

Michał Hanasz, Andrew W Strong, Philipp Girichidis

{"title":"Simulations of cosmic ray propagation.","authors":"Michał Hanasz, Andrew W Strong, Philipp Girichidis","doi":"10.1007/s41115-021-00011-1","DOIUrl":"https://doi.org/10.1007/s41115-021-00011-1","url":null,"abstract":"We review numerical methods for simulations of cosmic ray (CR) propagation on galactic and larger scales. We present the development of algorithms designed for phenomenological and self-consistent models of CR propagation in kinetic description based on numerical solutions of the Fokker-Planck equation. The phenomenological models assume a stationary structure of the galactic interstellar medium and incorporate diffusion of particles in physical and momentum space together with advection, spallation, production of secondaries and various radiation mechanisms. The self-consistent propagation models of CRs include the dynamical coupling of the CR population to the thermal plasma. The CR transport equation is discretized and solved numerically together with the set of MHD equations in various approaches treating the CR population as a separate relativistic fluid within the two-fluid approach or as a spectrally resolved population of particles evolving in physical and momentum space. The relevant processes incorporated in self-consistent models include advection, diffusion and streaming propagation as well as adiabatic compression and several radiative loss mechanisms. We discuss, applications of the numerical models for the interpretation of CR data collected by various instruments. We present example models of astrophysical processes influencing galactic evolution such as galactic winds, the amplification of large-scale magnetic fields and instabilities of the interstellar medium.","PeriodicalId":74085,"journal":{"name":"Living reviews in computational astrophysics","volume":"7 1","pages":"2"},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s41115-021-00011-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"39580561","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 13

PIC methods in astrophysics: simulations of relativistic jets and kinetic physics in astrophysical systems. 天体物理学中的PIC方法：天体物理系统中相对论性喷流和动力学物理的模拟。

Living reviews in computational astrophysics Pub Date : 2021-01-01 Epub Date: 2021-07-08 DOI: 10.1007/s41115-021-00012-0

Kenichi Nishikawa, Ioana Duţan, Christoph Köhn, Yosuke Mizuno

{"title":"PIC methods in astrophysics: simulations of relativistic jets and kinetic physics in astrophysical systems.","authors":"Kenichi Nishikawa, Ioana Duţan, Christoph Köhn, Yosuke Mizuno","doi":"10.1007/s41115-021-00012-0","DOIUrl":"10.1007/s41115-021-00012-0","url":null,"abstract":"The Particle-In-Cell (PIC) method has been developed by Oscar Buneman, Charles Birdsall, Roger W. Hockney, and John Dawson in the 1950s and, with the advances of computing power, has been further developed for several fields such as astrophysical, magnetospheric as well as solar plasmas and recently also for atmospheric and laser-plasma physics. Currently more than 15 semi-public PIC codes are available which we discuss in this review. Its applications have grown extensively with increasing computing power available on high performance computing facilities around the world. These systems allow the study of various topics of astrophysical plasmas, such as magnetic reconnection, pulsars and black hole magnetosphere, non-relativistic and relativistic shocks, relativistic jets, and laser-plasma physics. We review a plethora of astrophysical phenomena such as relativistic jets, instabilities, magnetic reconnection, pulsars, as well as PIC simulations of laser-plasma physics (until 2021) emphasizing the physics involved in the simulations. Finally, we give an outlook of the future simulations of jets associated to neutron stars, black holes and their merging and discuss the future of PIC simulations in the light of petascale and exascale computing.","PeriodicalId":74085,"journal":{"name":"Living reviews in computational astrophysics","volume":"7 1","pages":"1"},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8549980/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"39580560","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Physical, numerical, and computational challenges of modeling neutrino transport in core-collapse supernovae 核心坍缩超新星中中微子输运建模的物理、数值和计算挑战

Living reviews in computational astrophysics Pub Date : 2020-11-30 DOI: 10.1007/s41115-020-00010-8

A. Mezzacappa, E. Endeve, O. E. Bronson Messer, S. Bruenn

引用次数: 2

Correction to: MHD turbulence 修正为：MHD湍流

Living reviews in computational astrophysics Pub Date : 2020-06-08 DOI: 10.1007/s41115-020-00009-1

A. Beresnyak

引用次数: 0

Multi-scale simulations of particle acceleration in astrophysical systems 天体物理系统中粒子加速的多尺度模拟

Living reviews in computational astrophysics Pub Date : 2020-03-23 DOI: 10.1007/s41115-020-0007-6

A. Marcowith, G. Ferrand, M. Grech, Z. Meliani, I. Plotnikov, R. Walder

引用次数: 0

MHD turbulence MHD湍流

Living reviews in computational astrophysics Pub Date : 2019-09-10 DOI: 10.1007/s41115-019-0005-8

A. Beresnyak

引用次数: 30

Vlasov methods in space physics and astrophysics. 空间物理学和天体物理学中的弗拉索夫方法。

Living reviews in computational astrophysics Pub Date : 2018-01-01 Epub Date: 2018-08-16 DOI: 10.1007/s41115-018-0003-2

Minna Palmroth, Urs Ganse, Yann Pfau-Kempf, Markus Battarbee, Lucile Turc, Thiago Brito, Maxime Grandin, Sanni Hoilijoki, Arto Sandroos, Sebastian von Alfthan

{"title":"Vlasov methods in space physics and astrophysics.","authors":"Minna Palmroth, Urs Ganse, Yann Pfau-Kempf, Markus Battarbee, Lucile Turc, Thiago Brito, Maxime Grandin, Sanni Hoilijoki, Arto Sandroos, Sebastian von Alfthan","doi":"10.1007/s41115-018-0003-2","DOIUrl":"https://doi.org/10.1007/s41115-018-0003-2","url":null,"abstract":"This paper reviews Vlasov-based numerical methods used to model plasma in space physics and astrophysics. Plasma consists of collectively behaving charged particles that form the major part of baryonic matter in the Universe. Many concepts ranging from our own planetary environment to the Solar system and beyond can be understood in terms of kinetic plasma physics, represented by the Vlasov equation. We introduce the physical basis for the Vlasov system, and then outline the associated numerical methods that are typically used. A particular application of the Vlasov system is Vlasiator, the world's first global hybrid-Vlasov simulation for the Earth's magnetic domain, the magnetosphere. We introduce the design strategies for Vlasiator and outline its numerical concepts ranging from solvers to coupling schemes. We review Vlasiator's parallelisation methods and introduce the used high-performance computing (HPC) techniques. A short review of verification, validation and physical results is included. The purpose of the paper is to present the Vlasov system and introduce an example implementation, and to illustrate that even with massive computational challenges, an accurate description of physics can be rewarding in itself and significantly advance our understanding. Upcoming supercomputing resources are making similar efforts feasible in other fields as well, making our design options relevant for others facing similar challenges.","PeriodicalId":74085,"journal":{"name":"Living reviews in computational astrophysics","volume":"4 1","pages":"1"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s41115-018-0003-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"36895223","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 108

Higher-order accurate space-time schemes for computational astrophysics-Part I: finite volume methods. 计算天体物理学的高阶精确时空方案-第一部分:有限体积方法。

Living reviews in computational astrophysics Pub Date : 2017-01-01 Epub Date: 2017-12-11 DOI: 10.1007/s41115-017-0002-8

Dinshaw S Balsara

{"title":"Higher-order accurate space-time schemes for computational astrophysics-Part I: finite volume methods.","authors":"Dinshaw S Balsara","doi":"10.1007/s41115-017-0002-8","DOIUrl":"https://doi.org/10.1007/s41115-017-0002-8","url":null,"abstract":"As computational astrophysics comes under pressure to become a precision science, there is an increasing need to move to high accuracy schemes for computational astrophysics. The algorithmic needs of computational astrophysics are indeed very special. The methods need to be robust and preserve the positivity of density and pressure. Relativistic flows should remain sub-luminal. These requirements place additional pressures on a computational astrophysics code, which are usually not felt by a traditional fluid dynamics code. Hence the need for a specialized review. The focus here is on weighted essentially non-oscillatory (WENO) schemes, discontinuous Galerkin (DG) schemes and PNPM schemes. WENO schemes are higher order extensions of traditional second order finite volume schemes. At third order, they are most similar to piecewise parabolic method schemes, which are also included. DG schemes evolve all the moments of the solution, with the result that they are more accurate than WENO schemes. PNPM schemes occupy a compromise position between WENO and DG schemes. They evolve an Nth order spatial polynomial, while reconstructing higher order terms up to Mth order. As a result, the timestep can be larger. Time-dependent astrophysical codes need to be accurate in space and time with the result that the spatial and temporal accuracies must be matched. This is realized with the help of strong stability preserving Runge-Kutta schemes and ADER (Arbitrary DERivative in space and time) schemes, both of which are also described. The emphasis of this review is on computer-implementable ideas, not necessarily on the underlying theory.","PeriodicalId":74085,"journal":{"name":"Living reviews in computational astrophysics","volume":"3 1","pages":"2"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s41115-017-0002-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"36870738","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2