Gaussian wave packets — a new approach to seakeeping testsof ocean structures

Clauss, Günther F.; Bergmann, Jan

doi:10.1016/s0141-1187(86)80036-0

Cited by 50 publications

(23 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 4.1 shows the freak wave formation in a dispersive wave packet on shallow water. Similar solutions can be found for wave packet with a gaussian envelope in deep water (Clauss & Bergmann, 1986;Clauss, 1999;Magnusson et al, 1999) Exact solutions can be used for seakeeping tests or simulations of design of storm waves in ocean engineering. It is evident that in the framework of the linear theory it is easy to make a freak wave of any form: symmetric crest, hole in the sea, wave having a steeper forward face preceded by a deep trough (such form is used in some descriptions of the freak waves; see for instance, Lavrenov, 1998a,b).…”

Section: Dispersion Enhancement Of Transient Wave Groups (Spatio-tempmentioning

confidence: 85%

Physical mechanisms of the rogue wave phenomenon

Kharif

Pelinovsky

2003

European Journal of Mechanics - B/Fluids

1,011

764

View full text Add to dashboard Cite

Abstract:A review of physical mechanisms of the rogue wave phenomenon is given. The data of marine observations as well as laboratory experiments are briefly discussed. They demonstrate that freak waves may appear in deep and shallow waters. Simple statistical analysis of the rogue wave probability based on the assumption of a Gaussian wave field is reproduced. In the context of water wave theories the probabilistic approach shows that numerical simulations of freak waves should be made for very long times on large spatial domains and large number of realizations. As linear models of freak waves the following mechanisms are considered: dispersion enhancement of transient wave groups, geometrical focusing in basins of variable depth, and wave-current interaction. Taking into account nonlinearity of the water waves, these mechanisms remain valid but should be modified. Also, the influence of the nonlinear modulational instability (BenjaminFeir instability) on the rogue wave occurence is discussed. Specific numerical simulations were performed in the framework of classical nonlinear evolution equations: the nonlinear Schrödinger equation, the Davey -Stewartson system, the Korteweg -de Vries equation, the Kadomtsev -Petviashvili equation, the Zakharov equation, and the fully nonlinear potential equations. Their results show the main features of the physical mechanisms of rogue wave phenomenon.

show abstract

Section: Dispersion Enhancement Of Transient Wave Groups (Spatio-tempmentioning

confidence: 85%

Physical mechanisms of the rogue wave phenomenon

Kharif

Pelinovsky

2003

European Journal of Mechanics - B/Fluids

1,011

764

View full text Add to dashboard Cite

show abstract

“…At the David Taylor Model Basin, Davis and Zarnick, and Gersten and Johnson (1969) (Takezawa and Takekawa, 1976;Takezawa and Hirayama, 1976). Clauss and Bergmann (1986), Kuehnlein (1994, 1995), and Matos, et al (2005) used a transient wave technique with Gaussian wave-packets to excite model ships and offshore structures in an experimental basin. Further revisions to this technique included using nonlinear transient wave trains and modified wave celerity to generate extreme waves (Clauss, 1999).…”

Section: Administrative Informationmentioning

confidence: 99%

“…The second experiment (Phase II) consisted of two parts. The first part applied the wave-packet method to produce single large-amplitude waves, based on the technique developed by Clauss and Bergmann (1986) and Kuehnlein (1994, 1995).…”

Section: Introductionmentioning

confidence: 99%

“…Tl| second experiment (Phase II) consisted of two parts. The first part applied the wave-pack^ method to produce single large-amplitude waves, based on the technique developed by Clauss and Bergmann (1986) and Kuehnlein (1994, 1995). The second part employed tlj achievements from Phase I to embed grouped extreme waves, obtained through finite regular wa^j superposition in two scaled irregular seaways: a Bretschneider sea state 8 spectrum and a Hurricane Camille spectrum.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Formation of Large-Amplitude Wave Groups in an Experimental Model Basin

Bassler¹,

Lang²,

Lee³

et al. 2008

View full text Add to dashboard Cite

“…The earlier version of the wave packet method used a symmetric Gaussian spectrum (Clauss and Bergmann, 1986). The Gaussian wave packets have been used for example to generate extreme breaking wave impact on a vertical cylinder in an experimental wave flume (Wienke and Oumeraci, 2005).…”

Section: Introductionmentioning

confidence: 99%

Extreme Wave Generation, Breaking and Impact Simulations With REEF3D

Bihs

Kamath

Chella

et al. 2017

Volume 2: Prof. Carl Martin Larsen and Dr. Owen Oakley Honoring Symposia on CFD and VIV

View full text Add to dashboard Cite

An accurate description of extreme waves is necessary in order to estimate maximum wave forces on offshore structures. On several occasions freak waves have been observed in the past, some causing severe damage. In order to model such extreme wave conditions with a computational fluid dynamics (CFD) model, emphasize needs to be put on the wave generation. One possibility is to use focused waves of first or second order based on irregular sea state wave spectra. For focused waves, the wave phase is chosen, so that the waves focus in a predetermined location at a specified time. Numerical tests have shown, that generating extreme waves based on this method is somewhat limited. The individual wave components are steep enough, that they start to break before the focus location. In the current paper, transient wave packets are used for extreme wave generation. This way, extreme waves can be generated that are higher, but only break at the concentration point. The transient wave packets method is implemented in the open-source CFD software REEF3D. This model uses the level set method for interface capturing. For the hydrodynamics, the Navier-Stokes equations are solved in three dimensions. The code employs a staggered Cartesian mesh, ensuring tight pressure-velocity coupling. Complex geometries are handled with a ghost cell immersed boundary method. High-performance computing is enabled through domain decomposition based parallelization. Convection discretization of the different flow variables is performed with the fifth-order WENO (weighted essentially non-oscillatory) scheme. For the explicit time treatment a third-order Runge-Kutta scheme is selected. In order to validate the extreme wave generation, numerical tests in an empty wave tank are performed and compared with experimental data. Then, the extreme wave breaking on a vertical circular cylinder is investigated.

show abstract

Gaussian wave packets — a new approach to seakeeping testsof ocean structures

Cited by 50 publications

References 1 publication

Physical mechanisms of the rogue wave phenomenon

Physical mechanisms of the rogue wave phenomenon

Formation of Large-Amplitude Wave Groups in an Experimental Model Basin

Extreme Wave Generation, Breaking and Impact Simulations With REEF3D

Contact Info

Product

Resources

About