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arXiv 2211.00554physics.flu-dynmath-phmath.MP
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渐近能量耗散对三阶速度标度的依赖性

Dependence of the asymptotic energy dissipation on third-order velocity scaling

Kartik P. Iyer

AI总结:

本文利用 Kolmogorov 4/5 定律证明,三阶纵向绝对速度增量标度是否超过1决定了无粘极限下平均耗散能否非零,并据此判断湍流“零阶定律”。

摘要:

在三维湍流中,渐近能量耗散通过 Kolmogorov 4/5 定律与纵向速度增量幅值的三阶标度相联系。本文表明,要发生反常耗散,即在无粘极限下平均耗散不消失——也称为湍流的“零阶定律”——三阶纵向绝对速度增量标度不应超过1。相反,如果三阶纵向绝对速度增量标度超过1,则平均耗散必须在渐近意义上消失,并且速度增量场至少在其偏度层面将变得对称。本工作凸显了三阶绝对速度增量标度在评估湍流“零阶定律”地位方面的重要性。

英文摘要:

The asymptotic energy dissipation is connected to the third-order scaling of the longitudinal velocity increment magnitude in three-dimensional turbulence via the Kolmogorov $4/5$ law. It is shown that the third-order longitudinal absolute velocity increment scaling should not exceed unity for anomalous dissipation to occur, that is for non-vanishing average dissipation in the inviscid limit -- also known as the ``zeroth law" of turbulence. Conversely, if the third-order longitudinal absolute velocity increment scaling exceeds unity then the average dissipation must asymptotically vanish and the velocity increment field will becomes symmetric at least at the level of its skewness. This work highlights the importance of the third-order absolute velocity increment scaling in assessing the status of the ``zeroth-law" of turbulence.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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