Numerical investigation of fluid mud motion using a three-dimensional hydrodynamic and two-dimensional fluid mud coupling model

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• 作者：Xiaochen Yang (1)
  Qinghe Zhang (2)
  Linnan Hao (3)
  
  1. Research Institute of Water Resources and Hydropower ; Liaoning Province ; Shenyang ; 110003 ; Liaoning Province ; China
  2. State Key Laboratory of Hydraulic Engineering Simulation and Safety ; Tianjin University ; Tianjin ; 300072 ; China
  3. Office of Liaoning Provincial Flood Control and Drought Relief Headquarters ; Shenyang ; 110003 ; China
  
• 关键词：Fluid mud ; Two ; layer model ; Friction factor
• 刊名：Ocean Dynamics
• 出版年：2015
• 出版时间：March 2015
• 年：2015
• 卷：65
• 期：3
• 页码：449-461
• 全文大小：1,468 KB
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• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Oceanography
  Geophysics and Geodesy
  Meteorology and Climatology
  Fluids
  Structural Foundations and Hydraulic Engineering
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1616-7228

文摘

A water-fluid mud coupling model is developed based on the unstructured grid finite volume coastal ocean model (FVCOM) to investigate the fluid mud motion. The hydrodynamics and sediment transport of the overlying water column are solved using the original three-dimensional ocean model. A horizontal two-dimensional fluid mud model is integrated into the FVCOM model to simulate the underlying fluid mud flow. The fluid mud interacts with the water column through the sediment flux, current, and shear stress. The friction factor between the fluid mud and the bed, which is traditionally determined empirically, is derived with the assumption that the vertical distribution of shear stress below the yield surface of fluid mud is identical to that of uniform laminar flow of Newtonian fluid in the open channel. The model is validated by experimental data and reasonable agreement is found. Compared with numerical cases with fixed friction factors, the results simulated with the derived friction factor exhibit the best agreement with the experiment, which demonstrates the necessity of the derivation of the friction factor.