Laboratory Study of Wind- and Mechanically-generated Water Waves PDF Download
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Author: Takuji Waseda
Publisher:
ISBN:
Category :
Languages : en
Pages : 352
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Author: Takuji Waseda
Publisher:
ISBN:
Category :
Languages : en
Pages : 352
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Author: Michael Henry Gould
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ISBN:
Category :
Languages : en
Pages :
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Author: D. Lee Harris
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Category : Ocean-atmosphere interaction
Languages : en
Pages : 52
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Author: W. F. Baird
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ISBN:
Category : Ocean wave power
Languages : en
Pages :
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Author: W. Stanley Wilson
Publisher:
ISBN:
Category : Ocean waves
Languages : en
Pages : 110
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Book Description
An experimental study was conducted to measure the growth rates of mechanically generated surface water waves when subjected to fully developed turbulent channel airflow. The study was designed to test the accuracy of the growth rates predicted by the Miles; 1962 Theory. (Author).
Author: G. H. Smith
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Category :
Languages : en
Pages :
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Author: G. H. Smith
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ISBN:
Category :
Languages : en
Pages : 0
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Author: Susumu Karaki
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ISBN:
Category : Ocean waves
Languages : en
Pages : 126
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This investigation presents experimental results from a study of the structure of a turbulent boundary layer developed by air flow over water waves in a lab wind-wave channel. It was demonstrated that the sheared flow region is two-layered, similar to rough wall boundary layers. The inner layer, adjacent to the wall, is describable by the 'law of the wall' and the outer flow by the 'defect law.' The data were taken in two-dimensional flow with small favorable pressure gradients. The first part of the two-part investigation involved air flow over an initially still water surface on which waves developed in response to wind excitation. In the second part, air was passed over water waves of a single frequency and varied amplitude. The results indicated that within the range of this study the water surface can be classed as aerodynamically rough at wind speeds greater than 12 fps and the flow structure of the boundary layer corresponds to that over a rough wall. The velocity decrement due to surface roughness is shown to be a function of the local root-mean-square wave height. The effect of wave-induced fluctuations in the air is limited to a very close neighborhood of the wavy surface. For the specific combination of wind and wave speeds of this study it was found that while the amplitudes of the horizontal components of the fluctuation decreased with increasing elevation, the vertical component increased. (Author).
Author: Steven Roscoe Long
Publisher:
ISBN:
Category : Ocean waves
Languages : en
Pages : 222
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Author: Omar H. Shemdin
Publisher:
ISBN:
Category : Fluid dynamics
Languages : en
Pages : 272
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Book Description
This paper presents a fundamental study of the dynamics of wind in the vicinity of progressive water waves. The normal pressure distribution and the structure of the velocity profile immediately shows progressive water waves are investigated. The theory of Miles (1957) on the generation of surface waves by shear flows predicts a phase shift between the pressure distribution along a wavy surface and the wave itself. This shift becomes responsible for the transfer of energy from air to water due to normal pressure, thereby causing the waves to grow. An experimental verification of this theory is sought. The aerodynamic perturbation-pressure at the air-water interface was measured under two conditions: (1) the pressure sensor following the water surface and (2) the pressure sensor fixed in space above the crest. The results indicate that a pressure shift does exist as predicted by Miles within the assumptions of the theory. Furthermore, the results demonstrate clearly the importance of using a pressure sensor which follows the water surface in obtaining meaningful pressures at the air-water interface. The boundary layer above the water surface was also investigated and the results correlated with the measured pressures. Mean velocity profiles with and without mechanically-generated waves as well as instantaneous velocity profiles above the crest and trough of a mechanically-generated wave were obtained. Contrary to what is normally assumed, the results indicate that there exists a difference in structure between the boundary layer in the vicinity of water waves and that along a flat plate.
