Numerical simulations of a shock interacting with multiple magnetized clouds

Numerical simulations of a shock interacting with multiple magnetized clouds
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冲击与多个磁化云相互作用的数值模拟

DOI:
10.1093/mnras/stu1501
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发表时间:
2014
影响因子:
4.8
通讯作者:
Aluzas R
Aluzas R
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Aluzas R

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我们提出了与两个或三个圆柱形云团相互作用的激波的二维绝热磁流体动力学模拟。我们研究附近云的存在如何影响这种相互作用的动态,并探索每个云演化中所产生的差异和相似之处。从这项小规模研究中获得的理解将有助于解释具有数十或数百个云的系统的行为。我们在所研究的相互作用中观察到各种各样的行为,这些行为取决于云的初始位置以及磁场的方向和强度。我们发现(i)一些云沿着它们的场线延伸,而另一些云则受到它们的场线的限制; (ii) 上游云可能会加速经过下游云(尽管磁张力可以阻止这种情况发生); (iii) 当云相互“弹射”过去时,它们也可能改变与冲击波传播方向垂直的相对位置; (iv) 由于处于上游云的背风处,下游云可能会受到一些迎面而来的气流的保护; (v) 当附近有邻近云时,云压缩和重新膨胀的循环通常较弱; (vi) 当云彼此碰撞时,云物质中的等离子体 β 会迅速变化,但 β 的低值总是短暂的。这项工作与多相区域的研究相关,在这些区域中,快速、低密度的气体与稠密的云层相互作用,例如在星周气泡、超新星遗迹、超级气泡和银河风中。
We present 2D adiabatic magnetohydrodynamic simulations of a shock interacting with groups of two or three cylindrical clouds. We study how the presence of a nearby cloud influences the dynamics of this interaction, and explore the resulting differences and similarities in the evolution of each cloud. The understanding gained from this small-scale study will help to interpret the behaviour of systems with many 10s or 100s of clouds. We observe a wide variety of behaviour in the interactions studied, which is dependent on the initial positions of the clouds and the orientation and strength of the magnetic field. We find (i) some clouds are stretched along their field lines, whereas others are confined by their field lines; (ii) upstream clouds may accelerate past downstream clouds (though magnetic tension can prevent this); (iii) clouds may also change their relative positions transverse to the direction of shock propagation as they ‘slingshot’ past each other; (iv) downstream clouds may be offered some protection from the oncoming flow as a result of being in the lee of an upstream cloud; (v) the cycle of cloud compression and re-expansion is generally weaker when there are nearby neighbouring clouds; (vi) the plasma β in cloud material can vary rapidly as clouds collide with one another, but low values of β are always transitory. This work is relevant to studies of multiphase regions, where fast, low-density gas interacts with dense clouds, such as in circumstellar bubbles, supernova remnants, superbubbles and galactic winds.
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