GPU-Enabled General Relativistic Simulations of Misaligned Black Hole Accretion Systems

支持 GPU 的未对准黑洞吸积系统的广义相对论模拟

• 批准号: 1811605
• 负责人: Alexander Chekhovskoy
• 金额: $ 1.5万
• 依托单位: Northwestern University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-05-01 至 2019-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1811605&HistoricalAwards=false
• 关键词: GPU; Enabled; General; Relativistic; Simulations

A black hole accretion disk is a structure formed by diffused materials in orbital motion around a black hole (BH). From observations, the presence of tilted accretion disks around a BH is detected in some systems. However, the physics of accretion disks is poorly understood. This project will run very large scale simulations on the Blue Waters supercomputer to improve our fundamental understanding of BH accretion disks. Results of the proposed simulations will address long-standing questions in the way supermassive black holes consume and expel gas, and thereby exert feedback on their environment. These results will allow the physics community to gain first-principles understanding of disk physics in typical tilted BH accretion systems.Gas falling into a BH from large distances is unaware of BH spin direction, and misalignment between the accretion disk and BH spin is expected to be common. However, the physics of tilted disks is poorly understood, even for the "standard", geometrically thin, radiatively efficient accretion disks that power active galactic nuclei known as quasars and thought to provide the best observational tests of general relativity and disk physics. In particular, it is still not understood how the curved space-time of a spinning black hole imprints itself on the structure of the tilted disks. This project will make use of the fact that, at their core, BH accretion disks are well-described by the general relativistic magnetohydrodynamics (GRMHD) equations of motion. By carrying out direct GRMHD simulations of tilted thin and thick disks, the project will obtain the first-principles understanding of disk physics in typical, tilted BH accretion systems. To surmount the prohibitively expensive nature of these simulations, the project has constructed the first GPU-accelerated GRMHD code, H-AMR, which is capable of adaptive mesh refinement and is ideally suited for the Blue Waters supercomputer.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

黑洞积聚盘是由黑洞（BH）绕轨道运动形成的结构。 从观察结果中，在某些系统中检测到BH周围的倾斜积聚盘的存在。 但是，吸积盘的物理学知之甚少。 该项目将在蓝色水域超级计算机上进行非常大规模的模拟，以提高我们对BH积聚磁盘的基本理解。 拟议的模拟的结果将以超级质量的黑洞消耗和排出气体的方式解决长期存在的问题，从而对其环境施加反馈。 这些结果将使物理界能够在典型的倾斜BH积聚系统中获得对磁盘物理的第一原理理解。GAS从较大距离落入BH的情况并不意识到BH旋转方向，并且预期积聚盘和BH旋转之间的错位是常见的。然而，即使对于“标准”，几何薄，辐射有效的积聚磁盘，倾斜磁盘的物理学也很鲜为人知，这些磁盘能为活性银河核供电，被称为类星体，并被认为提供了一般相关性和磁盘物理学的最佳观察性测试。特别是，仍然不了解旋转黑洞的弯曲时空如何在倾斜磁盘的结构上贴上自己的印记。该项目将利用以下事实：从其核心，BH积聚磁盘由一般相对论磁性流体动力学（GRMHD）运动方程式很好地描述。通过对倾斜的薄磁盘进行直接的GRMHD模拟，该项目将获得对典型的，倾斜的BH积聚系统中磁盘物理学的第一原理理解。为了克服这些模拟的高昂昂贵性质，该项目构建了第一个GPU加速GRMHD代码H-AMR，该代码H-AMR能够自适应网状精炼，非常适合Blue Waters Supercuptuper。该奖项反映了NSF的法定任务，并反映了通过评估的构成群体的构成群体的构成群体的依据，该奖项的范围是众所周知的。