Theoretical Studies of the Structure and Dynamics of Cloudy Interstellar Medium Spiral Galaxies

将对星系气体流动动力学这一重要经典问题以及气体在星系结构和动力学中所起的作用进行理论和计算研究。正常螺旋星系和棒旋星系将成为研究的主要焦点，这些研究是近年来获得的大量改进和详细的观测数据，现在有可能进行新的确定测试并与观测结果进行比较。云粒子星系气体动力学和连续气体动力学在多管齐下的研究计划中是必不可少的。完整星系盘的详细模拟和选定局部区域的高分辨率模拟将并行研究，以更好地理解大设计与局部旋臂形态之间的关系。云层间的自引力效应、磁场相互作用和恒星形成过程也将是主要的研究领域。云的局部有效黏度是由云粒子模拟确定的，并用于生成星系气体流动的广义连续气体动力学描述，该描述适当地模拟了云星际介质（ISM）的平均输运特性。计算模拟在该工作中的应用是当前具有重要意义的课题，是一个单独的重点领域。模拟的高空间分辨率将用于与观测进行明确的比较，并为基于局部稳定性分析的理论预测提供仔细的检验。

Theoretical and computational studies on the important classic problem of the dynamics of galactic gas flows and the roles played by the gas in the structure and dynamics of galaxies will be carried out. Normal and barred spiral galaxies will be a major focus of the research of the wealth of improved and detailed observational data that has become available in recent years, now making possible new definitive tests and comparisons with observations. Cloud-particle galactic gas dynamics and continuum gas dynamics are essential in the multipronged program of research. Detailed simulations of full galactic disks and higher resolution simulations of selected local regions will be studied in parallel to better understand the relationship between grand design and local spiral arm morphologies. The effects of self gravitation among clouds, magnetic field interactions, and star formation processes will also be primary areas of focus. The local effective viscosity of the cloud is determined from the cloud-particle simulations and used to produce a generalized continuum gas dynamical description of galactic gas flows that properly simulates the average transport properties of the cloudy interstellar medium (ISM). The utilization of computational simulation in this work is a topic of great significance at the present time and is a separate major thrust area. The high spatial resolution of the simulations will be utilized to make definitive comparisons with observations and provide careful tests for theoretical predictions based on local stability analyses.