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arXiv 0802.3937physics.flu-dyn
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各向异性turbulence中能量耗散率的测量方法

Methods for measuring energy dissipation rate in anisotropic turbulence

Reginald J. Hill

摘要:

能量耗散率是几乎所有湍流实验的重要参数。在各向异性湍流的情况下,能量耗散率和其他可测量的统计量之间的数学精确关系对实验者是有用的。得到了以三阶和二阶速度结构函数以及加速度-速度结构函数为可测统计量的关系式。这些关系式是使用纳维-斯托克斯方程导出的,无需近似。近似版本的基础上获得的局部平稳性和局部同质性。后者适用于任意雷诺数的稳态均匀湍流情况。数学的精确使用需要在讨论部分中注意。

英文摘要:

Energy dissipation rate is an important parameter for nearly every experiment on turbulent flow. Mathematically precise relationships between energy dissipation rate and other measurable statistics for the case of anisotropic turbulence are useful to experimentalists. Such relationships are obtained for which the measurable statistics are the 3rd-order and 2nd-order velocity structure functions as well as the acceleration-velocity structure function. The relationships are derived using the Navier-Stokes equation without approximation. Approximate versions are obtained on the basis of local stationarity and local homogeneity. The latter are valid for arbitrary Reynolds numbers for the case of stationary, homogeneous turbulence. Precise use of the mathematics requires care noted in the Discussion section.

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