Self-preservation in a zero pressure gradient rough-wall turbulent boundary layer
Self-preservation in a zero pressure gradient rough-wall turbulent boundary layer
复制标题
零压力梯度粗壁湍流边界层的自守
DOI:
10.1017/jfm.2015.665
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发表时间:
2015
影响因子:
3.7
通讯作者:
R. Antonia
中科院分区:
文献类型:
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作者:
K. Talluru;L. Djenidi;M. Kamruzzaman;R. Antonia
A self-preservation (SP) analysis is carried out for a zero pressure gradient (ZPG) rough-wall turbulent boundary layer with a view to establishing the requirements of complete SP (i.e. SP across the entire layer) and determining if these are achievable. The analysis shows that SP is achievable in certain rough-wall boundary layers (irrespectively of the Reynolds number $Re$ ), when the mean viscous stress is zero or negligible compared to the form drag across the entire boundary layer. In this case, the velocity scale $u^{\ast }$ must be constant, the length scale $l$ should vary linearly with the streamwise distance $x$ and the roughness height $k$ must be proportional to $l$ . Although this result is consistent with that of Rotta (Prog. Aeronaut. Sci., vol. 2 (1), 1962, pp. 1–95), it is derived in a more rigorous manner than the method employed by Rotta. Further, it is noted that complete SP is not possible in a smooth-wall ZPG turbulent boundary layer. The SP conditions are tested against published experimental data on both a smooth wall (Kulandaivelu, 2012, PhD thesis, The University of Melbourne) and a rough wall, where the roughness height increases linearly with $x$ (Kameda et al., J. Fluid Sci. Technol., vol. 3 (1), 2008, pp. 31–42). Complete SP in a ZPG rough-wall turbulent boundary layer seems indeed possible when $k\propto x$ .
DOI:
--
发表时间:
2008
期刊:
Journal of Fluid Science and Technology Vol.3
影响因子:
--
作者:
Takatsugu Kameda;Shinsuke Mochizuki;Hideo Osaka;Katsuya Higaki
通讯作者:
Katsuya Higaki