Volumetric Theory of Intermittency in Fully Developed Turbulence
Volumetric Theory of Intermittency in Fully Developed Turbulence
复制标题
充分发展的湍流中间歇性的体积理论
DOI:
10.1007/s00205-023-01878-5
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发表时间:
2023
影响因子:
2.5
通讯作者:
Shvydkoy, Roman
中科院分区:
文献类型:
--
作者:
Cheskidov, Alexey;Shvydkoy, Roman
This study introduces a new family of volumetric flatness factors which give a rigorous parametric description of the phenomenon of intermittency in fully developed turbulent flows. These quantities gather information about the most “active" part of a velocity field at each scale, and allows one to define a dimension functionthat recovers intermittency correction to the structure exponentsin an explicit way. In particular, the predictions of the Frisch–Parisi multifractal formalism can be recovered in a systematic and rigorous way. Within this framework we identify active regions that carry the most energetic part of a velocity field at a given scale. A threshold for what constitutes being active is defined explicitly. Active regions have proven to be experimentally observable in our previous joint work (Nguyenet al. in Phys Rev E 99:053114, 2019), and been shown to capture concentration of the energy cascade as, inCheskidovandShvydkoy(SIAM J Math Anal 46(1):353–374, 2014). We present several examples of fields which exhibit arbitrary multifractal spectrum within theoretically permitted limitations. At the same time we demonstrate, with the use of a probabilistic argument, that a random field is expected to produce the classical K41 spectrum in the limit. Intermittent deviations from K41 theory are estimated at any finite scale also. Lastly, we present a detailed information-theoretic analysis of the introduced objects. In particular, we quantify concentration of a given source-field in terms of the volume factors, thresholds, and active regions.
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影响因子:
2
作者:
Cheskidov, A.;Shvydkoy, R.
通讯作者:
Shvydkoy, R.
影响因子:
8.6
作者:
Sreenivasan;Vainshtein;Bhiladvala;San Gil I;Chen;Cao
通讯作者:
Sreenivasan;Vainshtein;Bhiladvala;San Gil I;Chen;Cao
影响因子:
1.6
作者:
G. Eyink
通讯作者:
G. Eyink
影响因子:
2.4
作者:
Florian Nguyen;J. Laval;Pierre Kestener;A. Cheskidov;R. Shvydkoy;Bérengère Dubrulle
通讯作者:
Bérengère Dubrulle
DOI:
10.1017/prm.2018.33
发表时间:
2019-04-01
影响因子:
1.3
作者:
Cheskidov, Alexey;Dai, Mimi
通讯作者:
Dai, Mimi