Spectral transfer of self‐similar passive scalar fields in isotropic turbulence
Spectral transfer of self‐similar passive scalar fields in isotropic turbulence
复制标题
各向同性湍流中自相似被动标量场的谱传递
DOI：
10.1063/1.868176
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发表时间：
1994
期刊：
影响因子：
--
通讯作者：
P. Yeung
中科院分区：
文献类型：
--
作者：
P. Yeung
通过稳态各向同性湍流的直接数值模拟研究自相似状态下被动标量的谱传递。在高波数下，主要过程是前向级联局域传输，这是由非局域三元相互作用的结果，通过一种低波数速度模式将两个相似的高波数标量模式耦合在一起。这表明含能量涡流的平流将标量波动转移到更小的尺度。
The spectral transfer of passive scalars in a self‐similar state is studied by direct numerical simulations of stationary isotropic turbulence. At high wave numbers the dominant process is forward cascading local transfer as a result of nonlocal triadic interactions that couple together two similarly high wave‐number scalar modes by one low wave‐number velocity mode. This indicates that advection by the energy‐containing eddies transfers the scalar fluctuations towards smaller scales.