The dissipation rate coefficient of turbulence is not universal and depends on the internal stagnation point structure
The dissipation rate coefficient of turbulence is not universal and depends on the internal stagnation point structure
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DOI：
10.1063/1.3085721
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发表时间：
2009-03
影响因子：
4.6
通讯作者：
S. Goto;J. C. Vassilicos
中科院分区：
文献类型：
--
作者：
S. Goto;J. C. Vassilicos
统计上稳定的均匀各向同性湍流的能量耗散率系数取决于维持湍流的外力，而与雷诺数无关。通过证明泰勒长度与驻点之间的平均距离成正比，从而将能量耗散率系数与湍流的驻点结构相关联，而湍流的驻点结构又取决于大涡的结构，确立了这种非普适性。在中等雷诺数下，通过一系列系统改变大尺度强迫的直接数值模拟，对这些关系进行了验证。
The energy dissipation rate coefficient of statistically stationary homogeneous isotropic turbulence depends on the external force sustaining the turbulence irrespective of Reynolds number. This nonuniversality is established by proving that the Taylor length is proportional to the mean distance between stagnation points and thereby relating the energy dissipation rate coefficient to the stagnation point structure of the turbulence which is shown to depend on the structure of the large eddies. Confirmation of these relations is obtained at moderate Reynolds numbers by a series of direct numerical simulations where the large-scale forcing is systematically varied.