| Numerical Study on Instantaneous Discharge of Unsorted Particle Cloud in Cross Flow |
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| 作者姓名： | 顾杰 李志伟 杨红 詹咏 |
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| 作者单位： | Department of Environmental Engineering College of Marine Science and Technology，Shanghai Fisheries University，Department of Civil and Structural Engineering，The Hong Kong Polytechnic University，Department of Environmental Engineering，College of Marine Science and Technology，Shanghai Fisheries University，Department of Environmental Engineering，College of Urban Construction and Environment，University of Shanghai for Science and Technology，Shanghai 200090 China，Hunghom，Kowloon，Hong Kong China，Shanghai 200090，China，Shanghai 200093，China |
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| 基金项目： | This work was supported by a grant fromthe Research Grant Council of the Hong Kong Special Administrative Region(Project No5033/98E) |
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| 摘 要： | The mixing characteristics of particles such as dredged sediment of variable size discharged into cross flow are studied by a 3D numerical model, which is developed to model the particle-fluid two-phase flow. The Eulerian method with the modified k-ε parameterization of turbulence for the fluid phase is used to solve fluid phase, while a Lagrangian method for the solid phase (particles), both the processes are coupled through the momentum sources. In the model the wake turbulence induced by particles has been included as additional source term in the k-ε model; and the variable drift velocities of the particles are treated efficiently by the Lagrangian method in which the particles are tracked explicitly and the diffusion process is approximated by a random walk model. The hydrodynamic behavior of dumping a cloud of particles is governed by the total buoyancy of the cloud, the drag force on each particle and the velocity of cross-flow. The computed results show a roughly linear relationship between the displacement of the frontal position and the longitudinal width of the particle cloud. The particle size in the cloud and the velocity of cross flow dominate the flow behavior. The computed results are compared with the results of laboratory experiments and satisfactory agreement is obtained.
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| 关 键 词： | 交叉流 三维数学模型 两相流动 欧拉-拉格朗日方法 |
| 修稿时间： | 2007-01-092007-03-20 |
Numerical Study on Instantaneous Discharge of Unsorted Particle Cloud in Cross Flow |
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| GU Jie,LI Chi-wai,YANG Hong,ZHAN Yong.Numerical Study on Instantaneous Discharge of Unsorted Particle Cloud in Cross Flow[J].China Ocean Engineering,2007,21(2):305-316. |
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| Authors: | GU Jie LI Chi-wai YANG Hong ZHAN Yong |
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| Institution: | Department of Environmental Engineering, College of Marine Science and Technology, Shanghai Fisheries University, Shanghai 200090, China b Department of Civil and Structural Engineering, The Hong Kong Polytechnic University, Hunghom, Kowloon, Hong Kong, China c Department of Environmental Engineering, College of Urban Construction and Environment, University of Shanghai for Science and Technology, Shanghai 200093, China |
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| Abstract: | |
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| Keywords: | 3D numerical model two-phase flow Eulerian-Lagrangian method instantaneous discharge particle cloud cross flow |
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