Simulations of Multiphase Interstellar Turbulence with AMR

利用 AMR 模拟多相星际湍流

• 批准号: 0607675
• 负责人: Alexei Kritsuk
• 金额: $ 33.13万
• 依托单位: University of California-San Diego
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-07-15 至 2009-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0607675&HistoricalAwards=false
• 关键词: Simulations; Multiphase; Interstellar; Turbulence; AMR

AST-0607675KritsukThis research project, on how multiple thermal phases affect the turbulent cascade in the interstellar medium (ISM), exploits the potential of adaptive mesh refinement (AMR) techniques for simulating supersonic turbulent flows. High-resolution, three-dimensional numerical simulations with AMR are expected to give more reliable and comprehensive answers to some outstanding questions: How are thermal, magnetic, and gravitational effects coupled in the turbulent multiphase interstellar medium? What are the nature and manifestations of this coupling? How does turbulence in the multiphase ISM regulate the rate of star formation, and how does star-formation feedback force interstellar turbulence? Models that include magnetic fields, radiation transport, non-equilibrium chemistry, radiative cooling and heating, and thermal conduction, will be examined systematically and validated against observational data, both from the ground and from space. These simulations will determine the statistical characteristics of turbulent flows, the parameters for fractal gas density distributions, and the structural and dynamical properties of self-gravitating protostellar cores. This project will characterize the properties and signatures of turbulence in a multiphase ISM over a large dynamic range.Student training is an integral part of this research, but the main impact will come from the availability of the modified Enzo program, as well as raw and reprocessed simulation data, and other tutorial materials. The researchers also collaborate with Sun Microsystems, Inc. in advancing the scalability and portability of the Enzo code.

这项研究项目是关于星际介质(ISM)中多个热相如何影响湍流叶栅的，它利用自适应网格加密(AMR)技术来模拟超音速湍流流动。利用AMR进行的高分辨率三维数值模拟有望给出一些悬而未决的问题更加可靠和全面的答案：在湍流多相星际介质中，热效应、磁效应和引力效应是如何耦合的？这种耦合的性质和表现是什么？多相ISM中的湍流如何调节恒星形成的速度，以及恒星形成反馈如何迫使星际湍流？将对包括磁场、辐射传输、非平衡化学、辐射冷却和加热以及热传导在内的模型进行系统检查，并根据地面和空间的观测数据进行验证。这些模拟将确定湍流的统计特征、气体密度分布的分维参数以及自引力原恒星核的结构和动力学性质。该项目将描述大动态范围内多相ISM中湍流的特性和特征。学生培训是本研究不可或缺的一部分，但主要影响将来自修改后的Enzo程序的可用性，以及原始和重新处理的模拟数据，以及其他教程材料。研究人员还与太阳微系统公司合作，提高了Enzo代码的可扩展性和可移植性。