期刊
PHYSICS LETTERS A
卷 373, 期 27-28, 页码 2364-2367出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physleta.2009.04.071
关键词
Anomalous scaling; Inertial range; III-posedness; Strong dissipative events
资金
- US-Israel Binational Foundation (BSF)
- Israel Science Foundation
- Israel Academy of Sciences and Humanities.
The main point of this communication is that there exists a substantial number of strong events, contributing significantly to the PDF of velocity increments in the nominally-defined inertial range, for which viscosity/dissipation is of utmost importance at high Reynolds numbers. This contribution is largest to the tails of the PDF of velocity increments leading to anomalous scaling, especially of higher-order structure functions. Thus the anomalous scaling is not an attribute of the conventionally-defined inertial range, and the latter is not a well-defined concept. The claim above is supported by an analysis of high-Reynolds-number flows in which among other things it was possible to evaluate the instantaneous rate of energy dissipation. (C) 2009 Published by Elsevier B.V.
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