The Generation of Periodic Waves in a Laboratory Channel: A Comparison Between Theory and Experiment.

Keating, T.; Webber, Nb; Havelock, Th.H.

doi:10.1680/iicep.1977.3078

Cited by 8 publications

(6 citation statements)

References 1 publication

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“…170-186). Experimental confirmation of far-field wave amplitude predictions is provided, for example, by Ursell, Dean & Yu (1960), Galvin (1964, as referenced by Sulisz & Hudspeth, 1993, Keating & Weber (1977), Patel & Ioannou (1980), Hudspeth, Leonard, & Chen (1981), and Henderson & Lee (1986) for piston and flap-type wavemakers.…”

Section: Wavemaker Considerationsmentioning

confidence: 89%

On the laboratory generation of two-dimensional, progressive, surface waves of nearly permanent form on deep water

2006

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p. 391) explained three of these as being the consequence of sinusoidal forcing by the wavemaker array that did not include forced harmonics, either in time or in the direction parallel to the wavemaker. They predicted that neglected third-harmonic terms cause more serious consequences than neglected second-harmonic terms when the generated wavefields have two-dimensional surface patterns. This paper presents experiments that provide strong evidence that their explanation is correct: including the third-harmonic terms in the wavemaker forcing results in wave patterns that propagate with nearly permanent form.

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Section: Wavemaker Considerationsmentioning

confidence: 89%

On the laboratory generation of two-dimensional, progressive, surface waves of nearly permanent form on deep water

2006

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“…Linear wavemaker theories were derived by Havelock [7] and Biesel and Suquet [1]. Laboratory experiments carried out in wave flumes confirmed suitability of the linear wave theory to mechanically generated waves of low steepness [19,5,9].…”

Section: Introductionmentioning

confidence: 81%

Generation and Propagation of Nonlinear Waves in a Towing Tank

Drzewiecki

Sulisz

2019

Polish Maritime Research

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The paper presents the results of the research focused on linear and nonlinear wave generation and propagation in a deepwater towing tank equipped with a single flap-type wavemaker of variable draft. The problem of wave generation and propagation has been theoretically formulated and solved by applying an analytical method; linear and nonlinear solutions were obtained. The linear solution has been verified experimentally. The laboratory experiments confirmed that a linear model can be applied to predict the generation and propagation of water waves of low steepness. However, according to the analysis, the discrepancies between wave profiles predicted by applying the linear and nonlinear models rapidly increases with increasing wave steepness. Additionally, the secondary phenomena which occur in the towing tank, including: disintegration of wave profile, wave reflections from the beach and wave damping, were analyzed. Knowledge on the nonlinear processes and phenomena is essential for modeling the environmental conditions during tests carried out to secure the safety of the naval and offshore constructions. The theoretical formulation was derived and the solution was obtained by the Institute of Hydroengineering of the Polish Academy of Sciences IBW PAN while the experimental research was carried out in Ship Hydromechanics Division of the Ship Design and Research Centre CTO S.A.

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“…Limited experimental verifications of the Gilbert, et al (1971) design curves were reported by Krishnamacher (1972) and Gilbert, et al (1972). Wave heights predicted by these wavemaker theories have also been verified experimentally for piston wavemakers by Ursell, et al (1960), Galvin (1964), and Keating and Webber (1977); and for hinged wavemakers of variable draft by Galvin (1964), Patel and Ionnaou (1980), . An eigenfunction solution for the fluid motion generated by a generic planar wavemaker is presented that may also be used to analyze waves generated by TYPE E double-actuated wave generators.…”

Section: Résumémentioning

confidence: 99%

TYPE E double-actuated wavemakers

Hudspeth

Grassa

Medina

et al. 1994

Journal of Hydraulic Research

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The Ploeg and Funke TYPE E double-actuated wavemaker has been calibrated at the CEPYC-CEDEX Laboratory in Madrid, Spain. TYPE E double-actuated wavemakers are capable of operating as piston-only, hinged-only, or simultaneously as both piston and hinged wavemakers. An eigenfunction expansion for the fluid motion generated by a generic planar wavemaker of variable-draft is used to describe the motion of double-actuated wavemakers. This generic solution appears to be more robust and easier to apply in numerical codes than the ones that require the amplitude of the wavemaker stroke be specified at the still-water-level and that require the draft of the hinge to be forced to minus infinity in order to recover a piston wavemaker. The dimensionless transfer functions for the ratio of the wavemaker stroke to the wave amplitude are derived by equating the total average power generated by both actuators to the energy flux in the propagating wave. The solution is not unique because both the ratio of the amplitude of the piston actuator to the amplitude of the hinge actuator and the relative phase angle between the motion of the two actuators are arbitrary. Experimental verifications of the theory are given for each actuator operating independently as well as for three ratios of the piston amplitude to hinge amplitude when the relative phase angle is zero. These calibrations indicate that TYPE E double-actuated wavemakers are perhaps the optimum wavemakers for simulating double-peaked spectra such as the six parameter Ochi-Hubble spectra where the hinge actuator is optimum for generating the higher frequency components. RÉSUMÉUn générateur de houle a double actionneur (TYPE E dans la classification de Ploeg et Funke) a été calibre au laboratoire CEPYC-CEDEX a Madrid en Espagne. Les générateurs de houle du TYPE E cumulent les possibilités d'opérer en mode piston, en mode volet ou simultanément en mode mixte piston/volet. Une decomposition du mouvement du fluide produit par un batteur plan de cote variable par rapport au fond sur une base de fonctions propres données est adoptée pour représenter le mouvement de générateur de houle a double actionneur. Cette solution générale apparaït plus robuste et plus facile a appliquer dans les codes numériques que celles qui imposent que l'amplitude du mouvement du batteur soit spécifiée au niveau de la surface libre au repos ou qui obligent a forcer la cote du batteur volet a "moins l'infini" pour retrouver un batteur piston. Les fonctions de transfert adimensionnelles donnant le rapport de la course du batteur a l'amplitude de la houle sont obtenues en égalant l'énergie totale délivrée par les deux actionneurs au flux d'énergie de la houle générée. La solution obtenue n'est pas unique ïi cause des valeurs arbitrages pouvant être choisies pour le rapport des amplitudes de l'actionncur piston et de l'actionneur volet d'une part, et pour le déphasage relatif entre les

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The Generation of Periodic Waves in a Laboratory Channel: A Comparison Between Theory and Experiment.

Cited by 8 publications

References 1 publication

On the laboratory generation of two-dimensional, progressive, surface waves of nearly permanent form on deep water

On the laboratory generation of two-dimensional, progressive, surface waves of nearly permanent form on deep water

Generation and Propagation of Nonlinear Waves in a Towing Tank

TYPE E double-actuated wavemakers

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