Download or read book Generation of Water Waves by Turbulent Wind Flow written by and published by . This book was released on 1968 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Generation of Water Waves by Turbulent Wind Flow written by Paul Richard Klinedinst and published by . This book was released on 1968 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Generation of Ocean Waves by a Turbulent Wind written by James Hamilton Stuhmiller and published by . This book was released on 1973 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Mixing Length Treatment of the Effect of Turbulence on the Wind Generation of Water Waves written by William Porter Danner and published by . This book was released on 1966 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: A theoretical study is made of the shearing flow over a sinusoidal boundary representing the interface between the ocean and the atmosphere, with the main purpose being to investigate the pressure distribution at the interface and to calculate the energy transfer between the two media. The theory is developed on a model of turbulent flow making use of Prandtl's mixing length theory to represent the shearing stress terms in the basic Navier-Stokes equations. A curvilinear coordinate system which follows the wave train is used in order to simplify the equations, and to allow for a linearized solution which requires only that the wave amplitude be small in comparison to the wave length. All parameters are non-dimensionalized and the analysis is made without restriction as to the type of velocity profile. Various velocity profiles are investigated and, in general, the phase relations between the pressure at the interface and wave elevation imply a situation which could allow an energy input from the air flow to the wave. (Author).
Download or read book On Generation of Ocean Waves by a Turbulent Wind written by Robert Bryan Long and published by . This book was released on 1971 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Interaction of Ocean Waves and Wind written by Peter Janssen and published by Cambridge University Press. This book was released on 2004-10-28 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book was published in 2004. The Interaction of Ocean Waves and Wind describes in detail the two-way interaction between wind and ocean waves and shows how ocean waves affect weather forecasting on timescales of 5 to 90 days. Winds generate ocean waves, but at the same time airflow is modified due to the loss of energy and momentum to the waves; thus, momentum loss from the atmosphere to the ocean depends on the state of the waves. This volume discusses ocean wave evolution according to the energy balance equation. An extensive overview of nonlinear transfer is given, and as a by-product the role of four-wave interactions in the generation of extreme events, such as freak waves, is discussed. Effects on ocean circulation are described. Coupled ocean-wave, atmosphere modelling gives improved weather and wave forecasts. This volume will interest ocean wave modellers, physicists and applied mathematicians, and engineers interested in shipping and coastal protection.
Download or read book An Experimental Investigation of the Structure of a Turbulent Wind Over Water Waves written by Susumu Karaki and published by . This book was released on 1968 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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).
Download or read book Generation of Waves by Wind written by Charles L. Bretschneider and published by . This book was released on 1965 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contents: Practical applications -- deep water Significant wave concept Complex nature of sea surface Wave variability Wave spectrum concepts Froude scaling of the wave spectrum Propagation of waves and swells into shallow water Generation of wind waves in shallow water Generation of wind waves over a bottom of constant depth Decay of waves in deep water Wave statistics Wind speed versus wind speed.
Download or read book An Experimental Investigation of the Generation of Water Waves by Air Shear Flows written by Ashok Kumar Gupta and published by . This book was released on 1966 with total page 127 pages. Available in PDF, EPUB and Kindle. Book excerpt: A tank of length 46 in., width 12 in., and depth 5 1/4 in., tipped with a 4 1/2 in., long aluminum plate was filled with ordinary tap water and was placed parallel with a uniform air stream of low turbulence. Visual observations of the water free surface were made in the air speed range of 2 FPS to 26 FPS. (1) Allowing for the effects of slightly accelerating air flow and the finite length of the tank, the measured mean velocity profiles of the laminar air boundary layer agree in all essential aspects with Lock's velocity profile computed for zero pressure gradient. (2) Water wave generation by wind with laminar boundary layers consists of two phenomena: maintenance of water wave and initiation of water wave. A relatively low air speed can maintain a relatively long water wave but cannot initiate it. For the laminar boundary layer water waves of wavelengths 2 to 3 cm first appear at air speeds of 530 to 595 cm/sec. For the turbulent boundary layer the water waves first appear at air speeds of 350-400 cm/sec. (3) For air speeds greater than 23 FPS with the boundary layer laminar a Kel. Helm. type instability seems to occur. (4) Customary plots of neutral oscillations of Tollmien Schlichting waves modified by the water surface made for air speeds of 11.3, 17.5 and 20.6 FPS suggest a destabilising effect of the water surface.
Download or read book Wind Sea and Swell written by Harald Ulrik Sverdrup and published by . This book was released on 1947 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book On the generation of sea waves by a turbulent wind written by M. J. Manton and published by . This book was released on 1971 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Wind Over Wave Couplings written by S. G. Sajjadi and published by OUP Oxford. This book was released on 1999-04-29 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the most familiar phenomena on the planet, water waves remain an elusive question for science. The way in which wind blows over water and causes waves is a very active area of research for applied mathematicians, as well as for oceanographers and engineers. The basic mechanisms are still a matter of controversy, although the use of modern techniques of asymptotic and non-linear analysis and large-scale computation, as well as experimental structures, are beginning to reveal the underlying mechanics. These studies are resulting in increasingly powerful methods of forecasting waves and of gauging and controlling their effects on such things as sediment, pollution, and offshore structures. This volume covers the wide range of current research on the relationship between wind and waves and includes contributions from many of the leading authorities in the field.
Download or read book The Interaction of Waves and Turbulence in Water written by John David Skoda and published by . This book was released on 1972 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report investigates a system in which water waves are generated and propagated in a turbulent flow field. Growth of wind wave spectra and decay of monochromatic waves are considered. For monochromatic waves the turbulence in the water can greatly increase the rate of wave energy dissipation and that the data can be fitted by an equation with an eddy viscosity term proportional to the wave height, the phase speed of the waves, and the intensity of the larger scale turbulence. Growth of wind waves on turbulent water is faster than in still water; however, maximum wave height in turbulent water is always lower than in still water. Wave energy spectra at the longer fetches in turbulent water show more wave energy at low frequency and less at high frequency than those for still water. Turbulence in water alters the rate of transfer of energy from the wind to the waves, the maximum height allowed and the distribution of wave energy among the various frequencies. (Author).
Download or read book Turbulent Air Flow Over Wind Excited Laboratory Water Waves written by Scott Dudley Veenhuizen and published by . This book was released on 1973 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dynamics of Water Surface Flows and Waves written by Yasunori Watanabe and published by CRC Press. This book was released on 2022-11-11 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dynamics of Water Surface Flows and Waves provides theoretical descriptions of the whole life of water surface waves through their birth, propagation, evolution and finally breaking. While initial capillary waves are created via instability at air-water interfaces, potential wave theories adequately describe interactions of waves with current, bathymetry and structure. In the final breaking stage, potential fluid motions in the waves rapidly evolve into vortical turbulent flows that disturb the surfaces, resulting in entrainment of air-bubbles and ejection of sea spray in bursting bubbles floating on the surface. All theories and analytical methods required to understand the series of wave processes, over diverse areas of subjects, including turbulence, diffusion, vortex and capillary dynamics, shallow water approach, and stability analysis, as well as the conventional potential wave theory, are comprehensively covered in this book. All of the mathematical formulas are consistently developed from theorems and linked with physics, which provides theoretical understanding and further interest in wave dynamics. This is an ideal graduate-level textbook or reference for engineers and researchers in the fields of fluid and wave mechanics, coastal and ocean engineering.
Download or read book Wind Waves written by Blair Kinsman and published by Courier Corporation. This book was released on 1984-01-01 with total page 706 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this classic study, a renowned student of ocean wave theory examines the data requirements and details of the power spectral analysis required to make the wave revolution intelligible. Although the discussions center on waves, once the techniques are understood, they can be applied to many other areas. After outlining the nature of waves and wave processes and their methods of measurement and classification, the author provides a detailed exploration that relies heavily on mathematical models. Topics include perturbations of irrotational motion, energy considerations, wave generations by wind, and much more. The text is enhanced and clarified by 270 photos, figures, and tables. A helpful bibliography and indexes conclude this indispensable addition to the oceanographer's library.
Download or read book A Study of the Turbulent Layer in the Water at an Air water Interface written by Tak Kee Cheung and published by . This book was released on 1985 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt: Because global weather and ocean circulations are driven by energy transfers across the atmosphere-ocean interface, studies of it remain at the forefront of research in atmospheric sciences and oceanography. This experimental program was undertaken with the goal of learning how the energy, which is transferred from the wind, is distributed among the mean, wave, and turbulent flow fields in the water. Model test results show that the waves affect the mean flow, but the mean velocity profiles show logarithmic behavior. The wave field generally agrees with the prediction of a linear water-wave theory. In the wind-wave experiments, the turbulent quantities behave similar to those in flows over flat plates. In the mechanical-wave experiments, the turbulent quantities have different trends from those of the wind-wave cases, which suggests possible weak wave-related turbulence. The mean wave-induced shear stress is negative, which implies that the waves augment the mean flow. Thus, the waves can also transfer energy indirectly to turbulence via the mean flow. The turbulent field draws it energy from the mean flow through the mean turbulent shear stress and from the wave field via the wave-induced turbulent stresses. Keywords include: Ocean surface; and Laser doppler anemometer.
