Multimode stretched spiral vortex and nonequilibrium energy spectrum in homogeneous shear flow turbulence
Multimode stretched spiral vortex and nonequilibrium energy spectrum in homogeneous shear flow turbulence
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DOI：
10.1063/1.3567252
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发表时间：
2011-03
影响因子：
4.6
通讯作者：
K. Horiuti;T. Ozawa
中科院分区：
文献类型：
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作者：
K. Horiuti;T. Ozawa
拉伸螺旋涡[T. S. Lundgren，“Strained spiral vortex model for turbulent structures，”Phys.Fluids 25，2193（1982）]在均匀剪切流中的湍流中被识别，并且使用直接数值模拟数据来研究这种流的谱特性。阐明了平均切变对螺旋涡的产生、增长和湮灭过程的影响，并说明了螺旋涡在湍流产生中的作用。在均匀各向同性湍流[K。Horiuti和T. Fujisawa，“The multi mode stretched spiral vortex in homogeneous isotropic turbulence，”J.Fluid Mech.595，341（2008）]，提取螺旋涡流的多模。在涡核区涡量沿涡管沿着排列和双涡面绕涡管螺旋流动的情况下，常出现两种对称的构型模式。两个对称模态中的一个是由单个展向剪切层的常规卷起产生的。另一个是由Conve...
The stretched spiral vortex [T. S. Lundgren, “Strained spiral vortex model for turbulent structures,” Phys. Fluids 25, 2193 (1982)] is identified in turbulence in homogeneous shear flow and the spectral properties of this flow are studied using direct-numerical simulation data. The effects of mean shear on the genesis, growth, and annihilation processes of the spiral vortex are elucidated, and the role of the spiral vortex in the generation of turbulence is shown. As in homogeneous isotropic turbulence [K. Horiuti and T. Fujisawa, “The multi mode stretched spiral vortex in homogeneous isotropic turbulence,” J. Fluid Mech. 595, 341 (2008)], multimodes of the spiral vortex are extracted. Two symmetric modes of configurations with regard to the vorticity alignment along the vortex tube in the core region and dual vortex sheets spiraling around the tube are often educed. One of the two symmetric modes is created by a conventional rolling-up of a single spanwise shear layer. Another one is created by the conve...