A Numerical Study on Water Waves Generated by A Submerged Moving Body in A Two-Layer Fluid System  

作　　者：杨嘉桢 吴朝安 张道华 

机构地区：[1]Department of Mechanical Engineering, The University of Hong Kong

出　　处：《China Ocean Engineering》2009年第3期441-458,共18页中国海洋工程（英文版）

基　　金：supported by the Research Grants Council of the Hong Kong Special Administrative Region, China(Grant No. HKU7199/03E)

摘　　要：This is a numerical study on the time development of surface waves generated by a submerged body moving steadily in a two-layer fluid system, in which a layer of water is underlain by a layer of viscous mud. The fully nonlinear Navier- Stokes equations are solved on FLUENT with the Volume-of-Fluid （VOF） mnltiphase scheme in order to simulate, the free surface waves as wen as the water-mud interface waves as functions of time. The numerical model is validated by mimicking a reported experiment in a one-layer system before it is applied to a two-layer system. It is found that the presence of bottom mud in a water layer can lead to large viscous damping of the surface waves. For the investigation of the problem systematically, the effects of the Froude number and the mud layer thickness, density and viscosity relative to those of water are evaluated and discussed in detail.This is a numerical study on the time development of surface waves generated by a submerged body moving steadily in a two-layer fluid system, in which a layer of water is underlain by a layer of viscous mud. The fully nonlinear Navier- Stokes equations are solved on FLUENT with the Volume-of-Fluid （VOF） mnltiphase scheme in order to simulate, the free surface waves as wen as the water-mud interface waves as functions of time. The numerical model is validated by mimicking a reported experiment in a one-layer system before it is applied to a two-layer system. It is found that the presence of bottom mud in a water layer can lead to large viscous damping of the surface waves. For the investigation of the problem systematically, the effects of the Froude number and the mud layer thickness, density and viscosity relative to those of water are evaluated and discussed in detail.

关 键 词：wave-mud interaction solitary waves underwater moving body 

分 类 号：O357.1[理学—流体力学] TL411[理学—力学]