Knowledge Management System of Institue of Mechanics, CAS
| Statistics of Turbulence in Benthal Boundary Layers | |
Zhou JF(周济福) ; Yang SH; Zhou JF(周济福)
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| Source Publication | Second International Conference on Estuaries and Coasts |
| 2006-11-28 | |
| Pages | 1229-1235 |
| Conference Name | ICEC-2006 |
| Conference Date | 2006 |
| Conference Place | Guangzhou,China |
| Abstract | This paper deals with turbulence behavior inbenthalboundarylayers by means of large eddy simulation (LES). The flow is modeled by moving an infinite plate in an otherwise quiescent water with an oscillatory and a steady velocity components. The oscillatory one aims to simulate wave effect on the flow. A number of large-scale turbulence databases have been established, based on which we have obtained turbulencestatisticsof the boundarylayers, such as Reynolds stress, turbulence intensity, skewness and flatness ofturbulence, and temporal and spatial scales of turbulent bursts, etc. Particular attention is paid to the dependences of those statistics on two nondimensional parameters, namely the Reynolds number and the current-wave velocity ratio defined as the steady current velocity over the oscillatory velocity amplitude. It is found that the Reynolds stress and turbulence intensity profile differently from phase to phase, and exhibit two types of distributions in an oscillatory cycle. One is monotonic occurring during the time when current and wave-induced components are in the same direction, and the other inflectional occurring during the time when current and wave-induced components are in opposite directions. Current component makes an asymmetrical time series of Reynolds stress, as well as turbulence intensity, although the mean velocity series is symmetrical as a sine/cosine function. The skewness and flatness variations suggest that the turbulence distribution is not a normal function but approaches to a normal one with the increasing of Reynolds number and the current-wave velocity ratio as well. As for turbulent bursting, the dimensionless period and the mean area of all bursts per unit bed area tend to increase with Reynolds number and current-wave velocity ratio, rather than being constant as in steady channel flows. |
| Language | 英语 |
| Document Type | 会议论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/13930 |
| Collection | 力学所知识产出(1956-2008) |
| Corresponding Author | Zhou JF(周济福) |
| Recommended Citation GB/T 7714 | Zhou JF,Yang SH,Zhou JF. Statistics of Turbulence in Benthal Boundary Layers[C]Second International Conference on Estuaries and Coasts,2006:1229-1235. |
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| bj01301748.pdf（254KB） | 开放获取 | -- | View Application Full Text | |||
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