Self-regularization in turbulence from the Kolmogorov 4/5-law and alignment
Self-regularization in turbulence from the Kolmogorov 4/5-law and alignment
复制标题
柯尔莫哥洛夫 4/5 定律的湍流自调节和对齐
DOI:
10.1098/rsta.2021.0033
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发表时间:
2022
期刊:
影响因子:
--
通讯作者:
Drivas, Theodore D.
中科院分区:
文献类型:
--
作者:
Drivas, Theodore D.
A defining feature of three-dimensional hydrodynamic turbulence is that the rate of energy dissipation is bounded away from zero as viscosity is decreased (Reynolds number increased). This phenomenon—anomalous dissipation—is sometimes called the ‘zeroth law of turbulence’ as it underpins many celebrated theoretical predictions. Another robust feature observed in turbulence is that velocity structure functions Sp(ℓ):=⟨|δℓu|p⟩ exhibit persistent power-law scaling in the inertial range, namelyfor exponentsover an ever increasing (with Reynolds) range of scales. This behaviour indicates that the velocity field retains some fractional differentiability uniformly in the Reynolds number. The Kolmogorov 1941 theory of turbulence predicts thatfor alland Onsager’s 1949 theory establishes the requirement thatforfor consistency with the zeroth law. Empirically,and, suggesting that turbulent Navier–Stokes solutions approximate dissipative weak solutions of the Euler equations possessing (nearly) the minimal degree of singularity required to sustain anomalous dissipation. In this note, we adopt an experimentally supported hypothesis on the anti-alignment of velocity increments with their separation vectors and demonstrate that the inertial dissipation provides a regularization mechanism via the Kolmogorov 4/5-law.This article is part of the theme issue ‘Mathematical problems in physical fluid dynamics (part 2)’.
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DOI:
--
发表时间:
2014
期刊:
影响因子:
--
作者:
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通讯作者:
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影响因子:
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作者:
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作者:
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影响因子:
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作者:
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影响因子:
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作者:
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