Intermediate scaling and logarithmic invariance in turbulent pipe flow
Intermediate scaling and logarithmic invariance in turbulent pipe flow
复制标题
湍流管流中的中间标度和对数不变性
DOI:
10.1017/jfm.2021.71
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发表时间:
2021
影响因子:
3.7
通讯作者:
Diwan S
中科院分区:
文献类型:
--
作者:
Diwan S
A three-layer asymptotic structure for turbulent pipe flow is proposed revealing, in terms of intermediate variables, the existence of a Reynolds-number-invariant logarithmic region for the streamwise mean velocity and variance. The formulation proposes a local velocity scale (which is not the friction velocity) for the intermediate layer and results in two overlap layers. We find that the near-wall overlap layer is governed by a power law for the pipe for all Reynolds numbers, whereas the log law emerges in the second overlap layer (the inertial sublayer) for sufficiently high Reynolds numbers () and therefore the approach to an asymptotically invariant state can be expected to be slow.
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DOI:
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发表时间:
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期刊:
Ingenieur-Archiv
影响因子:
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