SFB 963: Astrophysical Flow Instabilities and Turbulence

SFB 963：天体物理流动不稳定性和湍流

• 批准号: 187005812
• 金额: --
• 依托单位: Georg-August-Universität Göttingen
• 依托单位国家: 德国
• 项目类别: Collaborative Research Centres
• 财政年份: 2012
• 资助国家: 德国
• 起止时间: 2011-12-31 至 2015-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/187005812?language=en
• 关键词: SFB; 963; Astrophysical; Flow; Instabilities

In astrophysics and cosmology, fluid flow occurs on a large range of scales and under very different conditions, from the dense interior of stars and planets to the highly rarefied intergalactic medium. These flows share the fact that they are generally turbulent, i.e. highly disordered both in space and time. Most astrophysical flows occur under conditions where the driving forces generate large fluctuations in velocity and pressure with important consequences for the transport of energy and mass. Turbulence is one of the key processes for the structure and evolution of a large variety of geo- and astrophysical systems. Astrophysical turbulence and instabilities occur in connection with rotation, convection and magnetic fields. The universality of astrophysical turbulence interlinks the physics of the interior of planets or stars with protoplanetary or galactic disks, as well as the intergalactic gas outside of galaxies. For example, angular momentum transport by turbulence is a central question that must be answered to understand how galaxies or stars form, how protoplanetary disks evolve, how metals are mixed in the interstellar and intergalactic medium, or how differential rotation is established in stars and planets. Magnetic field amplification through turbulent dynamo processes is ubiquitous in planets, stars and galaxies. The onset of instabilities due to dust particles or newly formed planets in protoplanetary disks controls the properties of the evolving structures. We can observe a variety of interactions between stars, planets and galaxies with their environment leading to the exchange of energy and (angular-)momentum. This compilation highlights the enormous potential and perspective of a collaborative effort to investigate the common underlying physical processes. Our combination of projects will enable us to understand aspects of turbulent magnetic field amplification, turbulence and instabilities of rotating fluids, and in the interaction of turbulence and instabilities with radiation, gravitation or dust particles and hence answer fundamental questions about the formation and evolution of galaxies, stars and planets.

在天体物理学和宇宙学中，流体流动发生在很大的尺度和非常不同的条件下，从恒星和行星的密集内部到高度稀薄的星系间介质。这些流动有一个共同的事实，即它们通常是湍流的，即在空间和时间上都是高度无序的。大多数天体物理流发生在驱动力产生速度和压力大波动的条件下，这对能量和质量的传输产生重要影响。湍流是许多地球和天体物理系统的结构和演化的关键过程之一。天体物理的湍流和不稳定与旋转、对流和磁场有关。天体物理湍流的普遍性将行星或恒星内部的物理学与原行星或星系盘以及星系外的星系间气体联系起来。例如，湍流的角动量传输是一个必须回答的核心问题，以理解星系或恒星是如何形成的，原行星盘是如何演变的，金属是如何在星际和星系间介质中混合的，或者恒星和行星是如何建立微分旋转的。在行星、恒星和星系中，通过紊流发电机过程产生的磁场放大是普遍存在的。由尘埃粒子或原行星盘中新形成的行星引起的不稳定性控制着演化结构的性质。我们可以观察到恒星、行星和星系与环境之间的各种相互作用，这些相互作用导致了能量和（角动量）的交换。这个汇编突出了研究共同底层物理过程的协作努力的巨大潜力和前景。我们的项目组合将使我们能够了解湍流磁场放大，旋转流体的湍流和不稳定性，以及湍流和不稳定性与辐射，引力或尘埃颗粒的相互作用，从而回答有关星系，恒星和行星形成和演化的基本问题。

项目成果

Scientific problems addressed by the Spektr-UV space project (world space Observatory—Ultraviolet)

• DOI: 10.1134/s1063772916010017
• 发表时间: 2016-01
• 期刊: Astronomy Reports
• 影响因子: 1
• 作者: A. Boyarchuk;B. Shustov;I. Savanov;M. Sachkov;D. Bisikalo;L. Mashonkina;D. Wiebe;V. Shematovich;Y. Shchekinov;T. Ryabchikova;N. Chugai;P. Ivanov;N. Voshchinnikov;A. Castro;S. Lamzin;N. Piskunov;T. Ayres;K. G. Strassmeier;S. Jeffrey;S. K. Zwintz;D. Shulyak;J. Gérard;B. Hubert;L. Fossati;H. Lammer;K. Werner;A. Zhilkin;P. Kaigorodov;S. Sichevskii;S. Ustamuich;E. Kanev;E. Y. Kil’pio

Helioseismology of sunspots: Defocusing, folding, and healing of wavefronts

太阳黑子的日震学：波前的散焦、折叠和修复

• DOI: 10.1051/0004-6361/201321483
• 发表时间: 2013
• 期刊: Astronomy and Astrophysics
• 影响因子: 6.5
• 作者: Schunker;Philippe
• 通讯作者: Philippe

Exploring the magnetic field complexity in M dwarfs at the boundary to full convection

探索M矮星在完全对流边界处的磁场复杂性

• DOI: 10.1051/0004-6361/201322136
• 发表时间: 2014
• 期刊: Astronomy and Astrophysics
• 影响因子: 6.5
• 作者: Shulyak;Reiners;Seemann;Kochukhov;Piskunov
• 通讯作者: Piskunov

The central dynamics of M3, M13, and M92: stringent limits on the masses of intermediate-mass black holes

M3、M13和M92的中心动力学：中等质量黑洞质量的严格限制

• DOI: 10.1051/0004-6361/201322183
• 发表时间: 2014
• 期刊: Astronomy and Astrophysics
• 影响因子: 6.5
• 作者: Kamann;Wisotzki
• 通讯作者: Wisotzki

Effects of turbulence and rotation on protostar formation as a precursor of massive black holes

湍流和旋转对作为大质量黑洞前兆的原恒星形成的影响

• DOI: 10.1051/0004-6361/201424658
• 发表时间: 2014
• 期刊: Astronomy and Astrophysics
• 影响因子: 6.5
• 作者: Van Borm;Bovino
• 通讯作者: Bovino