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
中科院分区:
文献类型:
--
作者:
Aluzas R
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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DOI:
10.1111/j.1365-2966.2010.17391.x
发表时间:
2010
影响因子:
4.8
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期刊:
The Astrophysical Journal Supplement Series
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