Turbulent mixing in the interstellar medium: an application for Lagrangian tracer particles
Turbulent mixing in the interstellar medium: an application for Lagrangian tracer particles
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星际介质中的湍流混合：拉格朗日示踪粒子的应用
DOI：
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发表时间：
2008
期刊：
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通讯作者：
W. Schmidt
中科院分区：
文献类型：
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作者：
C. Federrath;S. Glover;R. Klessen;W. Schmidt
本文采用三维数值模拟的方法，结合拉格朗日示踪粒子，对星际云中氢分子的混合过程进行了研究。示踪粒子用于表示冲击压缩的致密气体，其与H2相关。我们在密度对比度超过10ρ0的区域沉积存款示踪粒子，其中ρ0表示平均密度。根据它们的轨迹和概率分布函数，我们发现H2的混合时间尺度的上限，这是0.3百万年的顺序。这是显着小于分子云的寿命，这表明的重要性，湍流混合的氢作为一个初步阶段，星星的形成。
We use three-dimensional numerical simulations of self-gravitating compressible turbulent gas in combination with Lagrangian tracer particles to investigate the mixing process of molecular hydrogen (H2) in interstellar clouds. Tracer particles are used to represent shock-compressed dense gas, which is associated with H2. We deposit tracer particles in regions of density contrast in excess of 10ρ0, where ρ0 denotes the mean density. Following their trajectories and using probability distribution functions, we find an upper limit for the mixing timescale of H2, which is of the order of 0.3 Myr. This is significantly smaller than the lifetime of molecular clouds, which demonstrates the importance of the turbulent mixing of H2 as a preliminary stage to star formation.