The Experimental Study and Theoretical Analysis About the Ice-Wave Interaction

2003 ◽  
Author(s):  
Heqing Du
Keyword(s):  
Boundary Layer ◽  
Experimental Study ◽  
Numerical Calculation ◽  
Quantitative Analysis ◽  
Theoretical Analysis ◽  
Wave Attenuation ◽  
Ice Sheet ◽  
Wave Interaction ◽  
Ice Floes ◽  
The Waves

Experiments were performed to examine ice-wave interaction that the waves attenuate under continuation ice sheet and at ice floes. The analysis of ice-wave interaction and numerical calculation of the wave attenuation in floe zone are still important problems. It was understood that the reasons of the attenuation are creep, viscous, reflection and collision, and the viscosity has been calculated by using hydrodynamics method in the water boundary layer. Proportion of the every reason and the quantitative analysis has been done.

Experimental study of internal waves over a slope

1974 ◽  
Vol 66 (2) ◽  
pp. 223-239 ◽  
Author(s):  
David Cacchione ◽  
Carl Wunsch
Keyword(s):  
Boundary Layer ◽  
Experimental Study ◽  
Internal Waves ◽  
Spatial Dependence ◽  
Bottom Boundary Layer ◽  
Bottom Slope ◽  
Wave Characteristic ◽  
Bottom Boundary ◽  
The Waves ◽  
Wave Breakdown

Internal waves of the fundamental mode propagating into a shoaling region have been studied experimentally in a continuously stratified fluid. The waves divide into three classes depending upon the ratio of the bottom slope γ to the wave-characteristic slopec. For γ/c< 1, the amplitude and wavenumber changes of the waves over the slope are in reasonable accord with a simple inviscid linear theory, prior to wave breakdown near the intersection of the slope and surface. Considerable mixing occurs in this corner region. When γ/c= 1, a striking instability of the bottom boundary layer is observed and the waves are heavily damped. When γ/c> 1, the waves are inhomogeneous and have complex spatial dependence.

Numerical Simulation of Ice-Wave Interaction by Coupling DEM-CFD

2019 ◽  
Author(s):  
Teng-Chao Lu ◽  
Zao-Jian Zou
Keyword(s):  
Wave Interaction ◽  
Contact Forces ◽  
Discrete Elements ◽  
First Order ◽  
Linear Waves ◽  
Liquid Depth ◽  
Computational Fluid Dynamics Cfd ◽  
Ice Floes ◽  
Depth Ranges ◽  
The Waves

Abstract The motions of ice floes in linear waves were simulated by coupling Discrete Element Method (DEM) and Computational Fluid Dynamics (CFD). The interactions between ice floes are investigated by DEM. The hydrodynamics of ice floes, mainly including the drag force and the buoyancy, are calculated by CFD. In the simulation, the ice floes are treated as discrete elements, and the contact forces between ice floes are determined by the Hertz-Mindlin (no-slip) contact model. The shape of ice floes is an approximate square composed of a number of spherical faces, which can reduce the computation cost. The waves are treated as First Order Airy wave, which is linear in nature and applied to small amplitude waves in shallow liquid depth ranges. The volume of fluid (VOF) method was adopted to capture the free surface. The simulation results are in agreement with the actual situation to a certain extent.

On Turbulence-Induced Vibrations of a Thin Ribbon With Velocity-Dependent Damping

1970 ◽  
Vol 37 (4) ◽  
pp. 1172-1176 ◽  
Author(s):  
M. E. McCormick ◽  
T. C. Ripley
Keyword(s):  
Experimental Data ◽  
Boundary Layer ◽  
Experimental Study ◽  
Theoretical Analysis ◽  
Flat Plate ◽  
Free Stream ◽  
Turbulent Energy ◽  
Stream Velocity ◽  
Random Vibrations ◽  
Amplitude Response

Results of an experimental study of the turbulence-induced random vibrations of a thin metal ribbon show that an interaction between the vibrating surface and the turbulence exists which results in an increase in the turbulent energy within the boundary layer. In addition, the system damping is shown to vary with the free-stream velocity and to be proportional to the amplitude response of the ribbon. The experimental data and an accompanying theoretical analysis give support to the belief that the damping is primarily a velocity-squared type which is characteristic of a flat plate vibrating normally in a fluid.

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