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1. Hydraulic properties in the flow with floating plants | |||
Han Jie,Huai Wenxin,Zhao Mingdeng | |||
Hydraulic Engineering 21 January 2011 | |||
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Abstract:This paper focuses on the hydraulic properties of a turbulent flow with floating plants in straight ditches. Light plastic clusters were used to simulate the floating plants in laboratory and Micro ADV with the maximum frequency of 50 Hz was adopted to measure the turbulent flow. Experimental results of stream-wise velocity shows that the flow can be divided into a roots layer with uniform velocity and a water layer, which can be further divided into an upper and a lower sub-layer. As the theoretical analysis, the poroelastic theory is applied by regarding plant roots as an immovable skeleton. The control equations are simplified and solved to give the vertical distribution of velocity and shear stress, which agree well with the experimental data. The results indicate that the velocity distribution fits to the logarithm law in both upper and lower water layers. Otherwise, as the roughness of the roots is greater than the bed, the boundary of the two sub-layers is closer to the bed. | |||
TO cite this article:Han Jie,Huai Wenxin,Zhao Mingdeng. Hydraulic properties in the flow with floating plants[OL].[21 January 2011] http://en.paper.edu.cn/en_releasepaper/content/4408166 |
2. LES OF VERTICAL BUOYANT JETS IN JONSWAP WAVES | |||
Lu Jun,Wang Lingling,Zhu Hai | |||
Hydraulic Engineering 29 December 2010 | |||
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Abstract:A buoyant jet in irregular waves has been investigated by using large eddy simulation technique. The three dimensional filtered N-S and energy equation are numerically solved by fractional-step method in sigma-coordinate. The subgrid turbulent stress is modeled by a dynamic coherent eddy model proposed by the authors and the subgrid heat flux is also given by a dynamic eddy diffusivity model. The objective of this study is to investigate the characteristics of the buoyant jet with heat transfer in JONSWAP waves. The instantaneous process of diffusion of jet with heat transfer in random wave is given. The process of the jet-wave interaction is analyzed. The numerical result is of great theoretical importance for the understanding of jet behaviors in random waves. | |||
TO cite this article:Lu Jun,Wang Lingling,Zhu Hai. LES OF VERTICAL BUOYANT JETS IN JONSWAP WAVES[OL].[29 December 2010] http://en.paper.edu.cn/en_releasepaper/content/4402348 |
3. Investigations of Turbulent Wakes Past a Circular Cylinder | |||
Jiang Chunbo,Yang Chen | |||
Hydraulic Engineering 20 May 2008 | |||
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Abstract:Turbulent wakes past a circular cylinder are investigated by using both the numerical model and the digital Particle Image Velocimetry (PIV) technique. The fractional step finite element scheme is extended to simulate the turbulent wakes, it has good accuracy and stability properties, and is suitable for convection dominated flows in the wake region. The emphasize is put on simulating the unsteady vortex shedding processes and the saddle position, which are important for understanding the mechanism of the turbulent wakes. The time mean velocity properties are obtained, which show the recirculation region and the similarity characteristics are exist in the near region of the turbulent wakes. The numerical results are compared with the PIV measurements. | |||
TO cite this article:Jiang Chunbo,Yang Chen. Investigations of Turbulent Wakes Past a Circular Cylinder [OL].[20 May 2008] http://en.paper.edu.cn/en_releasepaper/content/21580 |
4. The Calculation of Optimal Hydraulic Cross Section in cubic Parabola-Shape Canal | |||
Yang Guoli,Wei Wenli,Yang Jie | |||
Hydraulic Engineering 21 December 2006 | |||
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Abstract:The formula of discharge varying with normal water depth in cubic parabola shape open channel uniform flow and the conditions satisfied by the optimal hydraulic cross section in the cubic parabola shape channel were deduced, according to the theory of open channel uniform flow. Compared with other types of open channel cross section, the cubic parabola shape open channel is one of the open channels which convey water more efficiently. | |||
TO cite this article:Yang Guoli,Wei Wenli,Yang Jie. The Calculation of Optimal Hydraulic Cross Section in cubic Parabola-Shape Canal[OL].[21 December 2006] http://en.paper.edu.cn/en_releasepaper/content/10424 |
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