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

理论和计算研究的重要 银河系气体流动动力学的经典问题， 气体在星系结构和动力学中的作用 将被执行。 正常和棒旋星系将是一个 研究的主要重点是改善和 最近获得的详细观测数据 多年来，现在使新的确定性测试和比较成为可能 进行观察。 云粒子星系气体动力学和 在这个多管齐下的计划中，连续介质气体动力学是必不可少的 的研究。 完整星系盘的详细模拟， 将对选定的局部区域进行更高分辨率的模拟， 同时进行研究，以更好地了解 大设计和局部旋臂形态。 的影响 云之间的自引力，磁场相互作用， 星星的形成过程也将是主要的重点领域。 确定了云的局部有效粘性 从云粒子模拟，并用于产生一个 星系气体的广义连续介质气体动力学描述 正确模拟平均传输特性的流 多云星际介质（ISM） 利用 在这项工作中的计算模拟是一个伟大的主题 在目前的意义，是一个单独的主要推力 区 模拟的高空间分辨率将是 用于与观察结果进行明确的比较， 为基于当地的理论预测提供仔细的测试 稳定性分析

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.