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Relevant bibliographies by topics / Water waves Wave-motion

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Academic literature on the topic 'Water waves Wave-motion'

Author: Grafiati

Published: 4 June 2021

Last updated: 13 February 2022

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Journal articles on the topic "Water waves Wave-motion"

1

Lundgren, H., and Torben Sorensen. "A PULSATING WATER TUNNEL." Coastal Engineering Proceedings 1, no. 6 (January 29, 2011): 21. http://dx.doi.org/10.9753/icce.v6.21.

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Since the basic mechanism of sand transportation in wave motion is so far unknown, there is a great need for observations of such transportation in large waves, especially, because of the possible difference of transportation in prototype wave motion from that in small model waves. By means of the apparatus described in the present paper the water and sediment motion near the bed can be reproduced on a prototype scale with the only modification that velocities at all points are in phase.

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Iversen, H. W. "WAVES AND BREAKERS IN SHOALING WATER." Coastal Engineering Proceedings 1, no. 3 (January 1, 2000): 1. http://dx.doi.org/10.9753/icce.v3.1.

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Wiegel and Johnson (1950) summarized useable wave theories for deep and shallow water. Mason (1950) discussed waves in shoaling water and compared theoretical predictions with measurements. The theories are shown to apply, within practical limits, to periodic systems of deep water waves, and to periodic waves progressing over a shoaling bottom to wave positions near the breaking point. Near and at the breaking position the wave features are not predicted from theory with desired accuracies and measured characteristics are used to describe breakers. The available measurements are limited and do not show the effects of variables such as the beach slope. Recent work at the University of California has resulted in information on the limits of applicability of the linearized wave theories as applied to wave transformation in shoaling water, and on breaker shapes and motion; including the effect of beach slope.

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Fang, Ming-Chung, Ming-Ling Lee, and Chwang-Kuo Lee. "Time Simulation of Water Shipping for a Ship Advancing in Large Longitudinal Waves." Journal of Ship Research 37, no. 02 (June 1, 1993): 126–37. http://dx.doi.org/10.5957/jsr.1993.37.2.126.

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The technique of time-domain numerical simulation for the occurrence of water shipping on board in head waves is presented. The nonlinear effects of the large-amplitude motion are treated. These nonlinear factors include the effect of large wave amplitude, large ship motion, the change of hull configuration below the free surface and the nonlinear resultant wave. Therefore, the variation of the potentials and the hydrodynamic coefficients for a ship at each time step must be carefully treated. While handling the determination of the instantaneous wave surface around the ship hull, the complete incident, diffracted, and radiated wave system is used rather than the incident wave only. The complexity of the ship speed effect on the related terms is also treated at each time step, especially for the radiation problems. An experimental setup is also designed to measure the motion response and the relative motion, and comparisons are made. The results show excellent agreement and the validity of the theory is confirmed. The successful development of the present technique can be extended to analyze the dynamic stability, capsize phenomena, and ship motion in irregular waves

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Ramsden, Jerald D., and John H. Nath. "KINEMATICS AND RETURN FLOW IN A CLOSED WAVE FLUME." Coastal Engineering Proceedings 1, no. 21 (January 29, 1988): 31. http://dx.doi.org/10.9753/icce.v21.31.

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Stokes (1847) showed that finite amplitude progressing waves cause a net drift of fluid, in the direction of wave motion, which occurs in the upper portion of the water column. In a closed wave flume this drift must be accompanied by a return flow toward the wave generator to satisfy the conservation of mass. This study presents Eulerian velocity and water surface measurements soon after the onset of wave motion from 12 locations in a large scale flume. Waves with .67 < kh < 2.29 and .09 < H/h < .39 were produced in a water depth of 3.5 meters. Superimposing the return flow theory of Kim (1984) with seventh order stream function theory is shown to improve the velocity predictions. The measured return flows are a function of time and depth and agree with Kim's theory as a first approximation. The mean water surface set-down agrees with the theory of Brevik (1979) except for the nearly deep water waves.

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Jamali, Mirmosadegh, and Gregory A. Lawrence. "Viscous Wave Interaction Due to Motion of a Surface Wave Over a Sediment Bed." Journal of Offshore Mechanics and Arctic Engineering 128, no. 4 (April 28, 2006): 276–79. http://dx.doi.org/10.1115/1.2217753.

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The results of a flume experiment and a theoretical study of surface wave motion over a fluidized bed are presented. It is shown that a resonant wave interaction between a surface wave and two interfacial waves at the interface of the fresh water and the fluidized bed is a strong mechanism for instability of the interface and the subsequent mixing of the layers. The interfacial waves are subharmonic to the surface wave and form a standing wave at the interface. The interaction is investigated theoretically using a viscous interaction analysis. It is shown that surface wave height and viscous effects are the determining factors in the instability mechanism. The results indicate that the net effect of viscosity on the interaction is to suppress the interfacial waves.

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Bendykowska, Genowefa, and Gosta Werner. "TRANSFORMATION OF SHALLOW WATER WAVE SPECTRA." Coastal Engineering Proceedings 1, no. 21 (January 29, 1988): 44. http://dx.doi.org/10.9753/icce.v21.44.

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Investigations are presented, on some effects of nonlinearity in the motion of shallow water wave spectra. The waves were generated, mechanically in a laboratory wave flume with fixed bottom. Essential differences with the linear dispersion relation are found, showing vanishing dispersivity of higher frequency spectral components in strongly nonlinear spectra. The mean frequency increases with decreasing water depth. The relation of the peak frequency to the mean frequency varied in the experiments from 0.9 to 0.5, for deep to shallow water wave spectra respectively.

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Onu, Kristjan, and N. Sri Namachchivaya. "Stochastically forced water waves in a circular basin." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 466, no. 2120 (March 10, 2010): 2363–81. http://dx.doi.org/10.1098/rspa.2009.0665.

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An analysis of wave motion under stochastic excitation is presented. The starting point is a Hamiltonian model of surface wave motion. This model is augmented with linear damping and stochastic forcing terms. An asymptotic scaling parameter is then introduced to show that the problem has three time scales. Integrability of the system is established for the case of two wave modes near 1:1 resonance. Stochastic averaging is used to reduce the dimensions of the system from four to two and the evolution of surface waves is now described, over long time scales and small amplitude stochastic forcing, by the evolution of the integrals of motion, as a random process. The domain of the generator of this random process is characterized and it includes a ‘gluing’ boundary condition. The adjoint of the generator yields the Fokker–Planck partial-differential equation (FPE). This equation governs the time evolution of the joint probability density of the two integrals of motion. The coefficients of the FPE are calculated numerically and the steady-state solution is found using the finite-element method. Results of the analysis show a distinct peak in the probability density along one edge of the reduced domain.

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Yuan, Peiyin, Pingyi Wang, and Yu Zhao. "Innovative Method for Ship Navigation Safety Risk Response in Landslide-Induced Wave." Advances in Civil Engineering 2021 (May 27, 2021): 1–10. http://dx.doi.org/10.1155/2021/6640548.

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When the bank of a reservoir slope slides along a weak structural plane at a high speed, “landslide slamming” will occur in the nearby water. The formation of landslide-induced waves is a serious threat to the safety of wharfs, shore marks, buildings in the water, and vessels navigating in reservoir areas. To ensure the safety of navigating ships, this study proposes a landslide-induced wave water ship navigation safety risk response technology. The propagation characteristics of landslide-induced waves are analysed based on a physical model experiment, and the characteristics of a ship's motion response and mooring cable tensions are studied under conditions of bow and stern mooring and multipoint mooring. The influences of the landslide-induced wave direction and ship navigation position on the ship rolling motion characteristics are discussed. The results of this study can further improve the navigation safety of ships in landslide-induced wave waters.

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Umeyama, Motohiko. "Dynamic-pressure distributions under Stokes waves with and without a current." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 376, no. 2111 (December 11, 2017): 20170103. http://dx.doi.org/10.1098/rsta.2017.0103.

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To investigate changes in the instability of Stokes waves prior to wave breaking in shallow water, pressure data were recorded vertically over the entire water depth, except in the near-surface layer (from 0 cm to −3 cm), in a recirculating channel. In addition, we checked the pressure asymmetry under several conditions. The phase-averaged dynamic-pressure values for the wave–current motion appear to increase compared with those for the wave-alone motion; however, they scatter in the experimental range. The measured vertical distributions of the dynamic pressure were plotted over one wave cycle and compared to the corresponding predictions on the basis of third-order Stokes wave theory. The dynamic-pressure pattern was not the same during the acceleration and deceleration periods. Spatially, the dynamic pressure varies according to the faces of the wave, i.e. the pressure on the front face is lower than that on the rear face. The direction of wave propagation with respect to the current directly influences the essential features of the resulting dynamic pressure. The results demonstrate that interactions between travelling waves and a current lead more quickly to asymmetry. This article is part of the theme issue ‘Nonlinear water waves’.

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Kilner, F. A. "MODEL TESTS ON THE MOTION OF MOORED SHIPS PLACED ON LONG WAVES." Coastal Engineering Proceedings 1, no. 7 (January 29, 2011): 40. http://dx.doi.org/10.9753/icce.v7.40.

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The equation of motion for a moored ship, subject to stationary wave action, is presented and discussed. The moorings are longitudinal, the ship is considered to be aligned to the direction of wave motion and positioned at a node, and the wave length is assumed long compared with the ship length. If the motion of the ship is assumed to be simple harmonic, and frictional forces between the ship and the water are neglected, an elementary analysis gives the required relation between the amplitudes of the ship's movement and of the water particle motion associated with the wave, A description is given of some tests carried out on model ships moored in a flume where stationary waves can be generated, and the amplitude and period can be varied independently. In these experiments, the amplitude of ship movement could be measured visually, or inferred from strain gauge readings, and the water motion was also observed. The results of these tests are compared with the simple theory. A table tilting harmonically is shown to be a mechanical analogy to stationary wave action on ships. The hydrodynamic mass for a ship moving in surge or sway motion is measured and is found to depend on the depth of water in which the ship is moored.

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Dissertations / Theses on the topic "Water waves Wave-motion"

1

Dally, William R. "Wave transformation in the surf zone." Gainesville, FL, 1987. http://www.archive.org/details/wavetransformati00dall.

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Hoseini, Sayed Mohammad. "Solitary wave interaction and evolution." Access electronically, 2007. http://www.library.uow.edu.au/adt-NWU/public/adt-NWU20080221.110619/index.html.

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Chiu, Ching-Sang Denner Warren W. "Report on the Office of Naval Research USA-China Conference on Shallow Water Acoustics, December 18-21, 1995." Monterey, CA : Naval Postgraduate School, 1997. http://catalog.hathitrust.org/api/volumes/oclc/37486128.html.

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Hoyle, M. Jeremy. "Some approximations to water wave motion over topography." Thesis, University of Reading, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.312539.

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Zhou, Zhengquan. "A theory and analysis of planing catamarans in calm and rough water." ScholarWorks@UNO, 2003. http://louisdl.louislibraries.org/u?/NOD,45.

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Thesis (Ph.D)--University of New Orleans, 2003.
Title from electronic submission form. "A dissertation ... in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Engineering and Applied Science"--Dissertation t.p. Vita. Includes bibliographical references.

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Ussembayev, Nail. "Nonlinear Wave Motion in Viscoelasticity and Free Surface Flows." Diss., 2020. http://hdl.handle.net/10754/664399.

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This dissertation revolves around various mathematical aspects of nonlinear wave motion in viscoelasticity and free surface flows. The introduction is devoted to the physical derivation of the stress-strain constitutive relations from the first principles of Newtonian mechanics and is accessible to a broad audience. This derivation is not necessary for the analysis carried out in the rest of the thesis, however, is very useful to connect the different-looking partial differential equations (PDEs) investigated in each subsequent chapter. In the second chapter we investigate a multi-dimensional scalar wave equation with memory for the motion of a viscoelastic material described by the most general linear constitutive law between the stress, strain and their rates of change. The model equation is rewritten as a system of first-order linear PDEs with relaxation and the well-posedness of the Cauchy problem is established. In the third chapter we consider the Euler equations describing the evolution of a perfect, incompressible, irrotational fluid with a free surface. We focus on the Hamiltonian description of surface waves and obtain a recursion relation which allows to expand the Hamiltonian in powers of wave steepness valid to arbitrary order and in any dimension. In the case of pure gravity waves in a two-dimensional flow there exists a symplectic coordinate transformation that eliminates all cubic terms and puts the Hamiltonian in a Birkhoff normal form up to order four due to the unexpected cancellation of the coefficients of all fourth order non-generic resonant terms. We explain how to obtain higher-order vanishing coefficients. Finally, using the properties of the expansion kernels we derive a set of nonlinear evolution equations for unidirectional gravity waves propagating on the surface of an ideal fluid of infinite depth and show that they admit an exact traveling wave solution expressed in terms of Lambert’s W-function. The only other known deep fluid surface waves are the Gerstner and Stokes waves, with the former being exact but rotational whereas the latter being approximate and irrotational. Our results yield a wave that is both exact and irrotational, however, unlike Gerstner and Stokes waves, it is complex-valued.

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Benevides, Francis Leo. "Estimating ocean wave directional spectra from measurements of water particle motion by a surface buoy acoustic ranging system." Thesis, 1990. http://hdl.handle.net/10125/10001.

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Blackmore, Natalie Lynn. "studies on the brown alga dictyopteris longifolia (Dictyotales), with special reference to the effects of wave action." Thesis, 2016. http://hdl.handle.net/10539/20835.

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A the'.is submitted to the Faculty of Science, University of the Witwatersrand, Johannesburg, in the fulfillment of the requirements of the Degree of Magister Scientae. June 1992
Aspects of the brown alga Pict~'ppt;eris lQ..n..qifolia at. Palm Beach, Natal, were investigated wi\'-;.hspecial reference to the effect of wave expozu~e~ A description of the species is giv~n and the nomencluture discussed. D~strib1i.ltion of n. ).or~gifolia was det~rmimad from literature and herbarium speof.mens . various r(\~:~thodosf measuring wave exposure were assessed and review~~d. At'!;:.emptswere made to quantify sand abrasion and deposition in tihe scudy si.tes. Morphological and structural aspect;s of the cha LLus were found to vary considerably with season and wave exposure" Light and scanning electron microscopy studie.s indicated the relatjvely complex cell organisation of this brown alga. The prolific regeneration from various thallus sections of .Q. longifolia indicate that regenerat.ion is an important survival strate 'JY following damage. Sexual reproduction and tetrasporogenesis were investigated. Sex.ual reproduction was not prolific in the field, however, tetraspores were abundant and are believed to be particul~rly importcmt in high wave exposure areas. 11. _j.Q.ngi;f'clige,x_periences a range of environmental conditions and responds to these with morphological, structural and reproductive &daptations.

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Hwung, Yi-Ping, and 黃一平. "The numerical study of characteristics of wave attenuation and motion amplitude for mooring plate under water surface." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/03238347806192278987.

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Books on the topic "Water waves Wave-motion"

1

G, Mazʹi͡a V., and Vaĭnberg B. R, eds. Linear water waves: A mathematical approach. New York: Cambridge University Press, 2002.

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2

S, Johnson R. A modern introduction to the mathematical theory of water waves. Cambridge: Cambridge University Press, 1997.

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3

Diemer, Ferdinand Joseph. A prony algorithm for shallow water waveguide analysis. Woods Hole, Mass: Woods Hole Oceanographic Institution, 1987.

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M, Rahman. Water waves: Relating modern theory to advanced engineering applications. Oxford: Clarendon Press, 1995.

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Conference on Water Waves: Theory and Experiment (2008 Howard University). Proceedings of the Conference on Water Waves: Theory and Experiment, Howard University, USA, 13-18 May 2008. Edited by Mahmood M. F, Henderson Diane, and Segur Harvey. New Jersey: World Scientific, 2010.

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6

Polukhina, O. E. Dinamika kraevykh voln v okeane. Nizhniĭ Novgorod: Nizhegorodskiĭ gos. tekhnicheskiĭ universitet, 2006.

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Polukhina, O. E. Dinamika kraevykh voln v okeane. Nizhniĭ Novgorod: Nizhegorodskiĭ gos. tekhnicheskiĭ universitet, 2006.

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8

Frisk, George V. Report on the Office of Naval Research Shallow Water Acoustics Workshop: April 24-26, 1991. Woods Hole, Mass: Woods Hole Oceanographic Institution, 1992.

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Smith, Ernest R. Laboratory study on macro-features of wave breaking over bars and artificial reefs. [Vicksburg, Miss: U.S. Army Engineer Waterways Experiment Station, 1990.

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Smith, Ernest R. Laboratory study on macro-features of wave breaking over bars and artificial reefs. [Vicksburg, Miss: U.S. Army Engineer Waterways Experiment Station, 1990.

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Book chapters on the topic "Water waves Wave-motion"

1

Nishimura, H., and S. Takewaka. "Numerical Analysis of Wave Motion Using the Lagrangian Description." In Nonlinear Water Waves, 119–26. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-642-83331-1_13.

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Swan, C. "A Viscous Modification to the Oscillatory Motion Beneath a Series of Progressive Gravity Waves." In Water Wave Kinematics, 313–29. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0531-3_19.

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McIver, P., and M. McIver. "The Forced Motion of Structures that Support Trapped or Near-Trapped Water Waves." In Mathematical and Numerical Aspects of Wave Propagation WAVES 2003, 475–80. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-642-55856-6_76.

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"Linear Water Waves." In Wave Motion, 74–129. Cambridge University Press, 2001. http://dx.doi.org/10.1017/cbo9780511841033.005.

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"Nonlinear Water Waves." In Wave Motion, 269–307. Cambridge University Press, 2001. http://dx.doi.org/10.1017/cbo9780511841033.010.

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Alexeyeva, Lyudmila, and Yergali Kurmanov. "Generalized and Fundamental Solutions of Motion Equations of Two-Component Biot’s Medium." In Mathematical Theorems - Boundary Value Problems and Approximations. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.92064.

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Here processes of wave propagation in a two-component Biot’s medium are considered, which are generated by arbitrary forces actions. By using Fourier transformation of generalized functions, a fundamental solution, Green tensor, of motion equations of this medium has been constructed in a non-stationary case and in the case of stationary harmonic oscillation. These tensors describe the processes of wave propagation (in spaces of dimensions 1, 2, 3) under an action of power sources concentrated at coordinates origin, which are described by a singular delta-function. Based on them, generalized solutions of these equations are constructed under the action of various sources of periodic and non-stationary perturbations, which are described by both regular and singular generalized functions. For regular acting forces, integral representations of solutions are given that can be used to calculate the stress-strain state of a porous water-saturated medium.

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Conference papers on the topic "Water waves Wave-motion"

1

Yan, S., Q. W. Ma, Jinghua Wang, and Juntao Zhou. "Self-Adaptive Wave Absorbing Technique for Nonlinear Shallow Water Waves." In ASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/omae2016-54475.

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A key challenge in long-duration modelling of ocean waves or wave-structure interactions in numerical wave tanks (NWT) is how to effectively absorb undesirable waves on the boundaries of the wave tanks. The self-adaptive wavemaker theory is one technique developed for this purpose. However, it was derived based on the linear wavemaker theory, in which the free surface elevation and the motion of the wavemaker are assumed to be approximately zero. Numerical investigations using the fully nonlinear potential theory based Quasi Arbitrary Lagrangian Eulerian Finite Element Method (QALE-FEM) suggested that its efficiency is relatively lower when dealing with nonlinear waves, especially for shallow water waves due to three typical issues associated with the wave nonlinearity including (1) significant wavemaker motion for extreme waves; (2) the mean wave elevation (i.e. the component corresponding to zero frequency), leading to a constant velocity component, thus a significant slow shift of the wavemaker; (3) the nonlinear components, especially high-order harmonics, may significantly influence the wavemaker transfer functions. The paper presents a new approach to numerically implement the existing self-adaptive wavemaker theory and focuses on its application on the open boundary, where all incident waves are expected to be fully absorbed. The approach is implemented by the NWT based on the QALE-FEM method. A systematic numerical investigation on uni-directional waves is carried out, following the corresponding validation through comparing the numerical prediction with experimental data for highly nonlinear shallow water waves.

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Karmakar, D., and C. Guedes Soares. "Wave Motion Control Over Submerged Horizontal Plates." In ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/omae2015-42070.

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The interaction of surface gravity waves with horizontal pitching plate for actively control waves is investigated based on the linearized theory of water waves. The two dimensional problem is formulated for the submerged plate pitching about its middle point and the other plate is considered to be floating above the submerged plate. The submerged plate’s thickness is considered negligible in comparison with the water depth and wavelength of the incident wave. The study is carried out using the matched eigenfunction expansion method and the analytical solution is developed for the interaction of the surface gravity waves with horizontal submerged structure. The numerical results for the reflection coefficient, transmission coefficient and free surface deflection are computed and analyzed. The study is carried to find the optimal value of the length and depth of the submerged plate at which the dissipation of the incident wave energy is observed. The reduction the wave transformation due to the pitching of the plate with the change in angle of incidence is also analyzed. The present study will be helpful in the analysis of proper functioning of submerged pitching plate to control wave motion for the protection of offshore structures.

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Yoshida, Takero, Daisuke Kitazawa, and Yoichi Mizukami. "Assessment of the Motion of Wave Power Generation by Water Tank Test." In ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/omae2017-61622.

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Installing devices of marine renewable energy is planned off Kamaishi city, Iwate prefecture, Japan. A device of wave power generation was settled at this site as a test case. It is important to coexist the power generation device and local fishermen. Since Kamaishi is known as a good fishing area, acceptance of fishermen is required to run the wave power generation at the test site. Especially, local fishermen in Kamaishi have a concern about how wave power generation moves along with ocean waves and currents. To acquire an acceptance from local fishermen in terms of setting wave power generation, a model test was conducted to understand the device of wave power generation. It consists of float, spar, middle float, gimbal mechanism and anchor. Middle float, gimbal mechanism and anchor are mooring. The submerged weights of the model almost satisfy the targeted values calculated by the scale ratio and actual submerged weights. The experiment was conducted for 1/125 scale model at a water tank in marine environmental and ecosystem laboratory, the university of Tokyo. We monitored the motion of the model under several conditions of regular waves and currents. The motions of the model were recorded by a video camera and were analyzed. The model was moved with respect to the surface waves and currents. We assessed the motions of the float based on the experiment. The experimental results will be used to explain local fishermen.

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Jamali, Mirmosadegh. "BEM Modeling of Viscous Motion of Surface Water Waves." In ASME 2004 23rd International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2004. http://dx.doi.org/10.1115/omae2004-51223.

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This study is concerned with numerical modeling of viscous surface wave motion using boundary element method (BEM). The equations of motion for thin boundary layers at the solid surfaces are coupled with the potential flow in the bulk of the fluid, and a mixed BEM-finite difference technique is used to obtain the surface wave motion characteristics including the decay rate. The technique is presented for a standing surface wave motion. The extension to other free surface problems is discussed.

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Jamali, Mirmosadegh, and Greg A. Lawrence. "Viscous Wave Interaction Due to Motion of a Surface Wave Over a Sediment Bed." In ASME 2004 23rd International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2004. http://dx.doi.org/10.1115/omae2004-51501.

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The results of a flume investigation of surface wave motion over a fluidized bed are presented. It is shown that a resonant wave interaction between a surface wave and two interfacial waves at the interface of the fresh water and the fluidized bed is a strong mechanism for instability of the interface and the subsequent mixing of the layers. The interfacial waves are subharmonic to the surface wave and form a standing wave at the interface. The interaction is investigated theoretically using a fully viscous interaction analysis. It is shown that surface wave height and viscous effects are the determining factors in the instability mechanism. The results indicate that the net effect of viscosity on the interaction process is to suppress the interfacial waves.

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6

Buchner, Bas, and Frederick Jaouen. "‘Inverse’ Concept: Wave Energy Generation by Motion and Green Water Maximisation." In ASME 2009 28th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2009. http://dx.doi.org/10.1115/omae2009-79579.

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This paper presents the initial investigations into the ‘Inverse’ concept for wave energy conversion, based on the maximisation of motions and green water. The ‘Inverse’ concept combines aspects of ‘overtopping’, ‘heaving’ and ‘pitching’ wave energy conversion concepts, but also adds specific aspects such as the use of green water. Instead of reducing the motions and green water as is done in normal offshore hydrodynamics, the ‘Inverse’ concepts tries to maximise the motions and green water to generate energy from the waves. Results are presented of frequency domain calculations for the motion (de-) optimisation. Improved Volume Of Fluid (iVOF) simulations are used to simulate the green water flow on the deck. It is concluded that the potential of the ‘Inverse’ concept is clear. As a result of the double connotation of the word ‘green’, this renewable energy concept could also be called the ‘green water’ concept. Further work needs to be carried out on the further optimisation of the concept.

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Chen, Yu, Yali Zhang, Mimi Gao, Johan Gullman-Strand, Rajeev Kumar Jaiman, MyHa Dao, and Lup Wai Chew. "Numerical Simulation of Oblique Wave in Water Basin." In ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/omae2015-41807.

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Simulation of more realistic ocean conditions in wave basins is becoming important for offshore industry. As spreading wave has become more desirable, the capability of reproducing oblique planar wave train is critical for a wave basin’s performance. In this study, the oblique waves have been simulated in a numerical wave basin based on the volume of fluid (VOF) method and Navier-Stokes solver. Multi-element bottom hinged flap motion using the conventional snake principle has been simulated by moving boundary dynamic mesh in OpenFOAM. Finite length of the entire wave maker and finite width of each paddle caused considerable spatial variations in wave height and wave propagating direction. Beaches with slope have been implemented to minimize the sidewall reflection and improve the uniformity of the oblique wave field. The generated linear oblique waves have been compared with the analytical solutions for validation in terms of uniformity and wave height. The time history of the surface elevation at different locations have been computed to investigate the uniformities of general wave fields. In addition, the free surface along the wave propagating direction has also been investigated to show the quality of the generated wave.

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Waals, Olaf J. "On the Application of Advanced Wave Analysis in Shallow Water Model Testing (Wave Splitting)." In ASME 2009 28th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2009. http://dx.doi.org/10.1115/omae2009-79413.

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The HAWAI JIP originated from the observed differences between model tests and numerical simulations in shallow water. These differences were identified as being caused by spurious free waves and reflected waves in the model basin. Identifying these waves and incorporating them in the numerical simulations greatly improved the agreement between the model test results and the simulation results. Although the effect of spurious waves is also present in deep water, the effect is most profound in shallow water. The research therefore focused on shallow water, further refinement of wave identification, the background and theory behind spurious free waves, the effect of these waves on the motions of a LNG carrier and the occurrence of free waves in reality. In order to identify the different types of wave systems in a model basin a wave splitting (or separation) technique has been developed. This paper describes the current state-of-the-art of wave splitting and its limitations. Results are presented in the form of motion statistics of an LNG carrier that is moored in 15 m and 30 m water depth. The model tests results are compared with simulation results with and without the wave splitting methodology.

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Lin, Ray-Qing, and Weijia Kuang. "Ship Motion Instabilities in Coastal Regions." In ASME 2009 28th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2009. http://dx.doi.org/10.1115/omae2009-79753.

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Ship motion instabilities occur much more frequently in coastal regions than in the deep ocean because both nonlinear wave-wave interactions and wave-current interactions increase significantly as the water depth decreases. This is particularly significant in the coastal regions connecting to the open ocean, since the wave resonant interactions change from the four-equivalent-wave interaction in deep water to the interactions of three local wind waves with a long wave (e.g. swell, edge waves, bottom topography waves, etc.) in shallow water [1, 2], resulting in rapid growth of the incoming long waves. In this study, we use our DiSSEL (Digital, Self-consistent, Ship Experimental Laboratory) Ship Motion Model [3,4,5,6] coupled with our Coastal Wave Model [1,2,11] and an Ocean Circulation Model [7] to simulate strongly nonlinear ship motions in coastal regions, focusing on the ship motion instabilities arising from ship body-surface wave-current interactions.

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Kim, Jeongrok, and Il-Hyoung Cho. "Heave Motion Performance of Multiple Wave Energy Converters Arrayed in a Water Channel Resonator." In ASME 2020 39th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/omae2020-18554.

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Abstract The performance of multiple wave energy converters (WECs) arranged in a Y-shaped water channel resonator (WCR) for amplifying the wave energy with low density was investigated. The WCR consists of a long channel and waveguide installed at the entrance. If the period of the incident wave coincides with the natural period of the fluid in the WCR, then resonance occurs, and the internal fluid is greatly amplified in the form of standing waves. The WECs were positioned at the anti-nodes of standing waves formed in the WCR to maximize energy extraction. We dealt with the heave motion, time-averaged power, and capture width ratio (CWR) of WECs, which are composed of a heaving cylinder and a linear generator. For this purpose, we used the boundary element method and WAMIT commercial code. In parallel, systematic model tests were conducted at the 2D wave tank in Jeju National University to validate the numerical solution. Both results were in good agreement. WECs with a short draft are efficient in energy extraction compared with WECs with a long draft. Numerical and experimental results reveal that the WECs arranged in a WCR have higher efficiency over a wide band of periods than a single WEC without a WCR. Therefore, the wave energy with low density can be amplified by the resonance of the internal fluid in the WCR.

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