期刊
JOURNAL OF FLUID MECHANICS
卷 500, 期 -, 页码 135-144出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S002211200300733X
关键词
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The spectra and correlations of the velocity fluctuations in turbulent channels, especially above the buffer layer, are analysed using new direct numerical simulations with friction Reynolds numbers up to Re(iota) = 4900. It is found, and explained, that their scaling is anomalous in several respects, including a square-root behaviour of their width with respect to their length, and a velocity scaling of the largest modes with the centreline velocity U(c). It is shown that this implies a logarithmic correction to the k(-1) energy spectrum, and that it leads to a scaling of the total fluctuation intensities away from the wall which agrees well with the mixed scaling of de Graaff & Eaton 2000) at intermediate Reynolds numbers, but which tends to a pure scaling with U(c) at very large ones.
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