对流云的流体动力学：牵伸、生存、凝结和消融
Hydrodynamics of Clustered Clouds: Drafting, Survival, Condensation, and Ablation
摘要：
对于等人，谁编目麦哲伦流（MS）云，建议有大量的大规模湍流在MS。在这里，我们跟进了一系列的FLASH模拟，模拟云对彼此的流体动力学效应。这套模拟包括一系列的云分离距离和密度。环境条件类似于MS周围的环境条件，但也与环星系介质和星系际介质有关。十个模拟，其中八个模型集群云和两个模型孤立的云。孤立的云被用作与多云模拟进行比较的对照。我们发现，如果云最初是彼此接近，然后流体动力学起草帮助尾随云赶上领先的云和混合在一起。我们提出了测量的加速度，由于起草和发现，低密度的云在低密度的环境中经历更多的加速度，由于起草比他们更密集的同伙。我们发现云的聚集也增加了周围物质的凝结，影响寿命。我们用单分量法和多分量分解法分析了云的速度频散。我们发现，第二个云的存在下，在某些时候增加了后面的拖尾云的速度色散。我们发现，在我们的模拟中，由于气体运动引起的速度色散明显小于For等人观察到的实际色散，表明热分量在MS中必须占主导地位。
英文摘要：
For et al., who catalogued Magellanic Stream (MS) clouds, suggested that there is substantial large-scale turbulence in the MS. Here we follow up with a series of FLASH simulations that model the hydrodynamic effects that clouds have on each other. The suite of simulations includes a range of cloud separation distances and densities. The ambient conditions are similar to those surrounding the MS but also relevant to the circumgalactic medium and intergalactic medium. Ten simulations are presented, eight of which model clustered clouds and two of which model isolated clouds. The isolated clouds are used as controls for comparison with the multicloud simulations. We find that if the clouds are initially near each other, then hydrodynamical drafting helps the trailing cloud to catch the leading cloud and mix together. We present the measured acceleration due to drafting and find that lower-density clouds in lower-density environments experience more acceleration due to drafting than their denser cohorts. We find that the clustering of clouds also increases the condensation of ambient material and affects longevity. We analyze the velocity dispersion of the clouds using a single component method and a multicomponent decomposition method. We find that the presence of a second cloud increases the velocity dispersion behind the trailing cloud at some times. We find that the velocity dispersion due to gas motion in our simulations is significantly less than the actual dispersion observed by For et al., indicating that the thermal component must dominate in the MS.
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