Under suitable assumptions, the nonlinear dynamics of surface gravity waves can be modeled by one-dimensional Schrödinger equation. Besides traveling wave solutions like solitons, this model admits also breather that are now considered as prototypes rogue in ocean. We propose a novel technique to study interaction between and ships/structures during extreme ocean conditions using such solutions. In particular, we discuss state art sea-keeping test 90-meter long tank creating Peregrine...

We observe the dispersive breaking of cosine-type long waves [Phys. Rev. Lett. 15, 240 (1965)] in shallow water, characterizing highly nonlinear ``multisoliton'' fission over variable conditions. provide new insight into interpretation results by analyzing data terms periodic inverse scattering transform for Korteweg--de Vries equation. In a wide range dispersion and nonlinearity, compare favorably with our analytical estimate, based on rigorous WKB approach, number emerging solitons. are...

This paper discusses the potential of deterministic wave prediction as one basic module for decision support offshore operations. Therefore, methods different complexity—the linear solution, non-linear Schrödinger equation (NLSE) two orders and high-order spectral method (HOSM)—are presented in terms applicability limitations use. For this purpose, irregular sea states with varying parameters are addressed by numerical simulations well model tests controlled environment a seakeeping basin....

The problem of existence stable nonlinear groups gravity waves in deep water is considered by means laboratory and numerical simulations with the focus on strongly waves. Wave steepness up to Acrωm2/g ≈ 0.30 are reproduced experiments (Acr wave crest amplitude, ωm mean angular frequency, g acceleration). We show that remain exhibit neither noticeable radiation nor structural transformation for more than 60 wavelengths or about 15-30 group lengths. These solitary patterns differ from...

Algorithms for reconstructing and predicting nonlinear ocean wave fields from remote measurements are presented. Three types of synthetic observations used to quantify the influence measurement modulation mechanisms on algorithms’ performance. First, correspond randomly distributed surface elevations. Then, they related a marine radar model – second type takes shadowing into account whereas third one also includes tilt modulation. The numerically generated based unidirectional waves various...

The investigation of dynamics intense solitary wave groups collinear surface waves is performed by means numerical simulations the Euler equations and laboratory experiments. processes generation, reflection from a wall, collisions are considered. Steep with characteristic steepness up to kAcr ≈ 0.3 (where k dominant wavenumber Acr crest amplitude) concerned. They approximately restore structure after interactions. In course interaction wall collisions, maximum amplitude crests shown enhance...

The existence of freak waves is indisputable due to observations, registrations, and severe accidents. occurrence extreme waves, their characteristics impact on offshore structures one the main topics ocean engineering research community. Real sea measurements play a major role for complete understanding this phenomenon. In majority cases only single point registrations real are available which hinders draw conclusions formation process spatial development in front behind respective...

The measurement of deep water gravity wave elevations using in situ devices, such as gauges, typically yields spatially sparse data due to the deployment a limited number costly devices. This sparsity complicates reconstruction spatio-temporal extent surface elevation and presents an ill-posed assimilation problem, which is challenging solve with conventional numerical techniques. To address this issue, we propose application physics-informed neural network (PINN) reconstruct physically...

In the past years existence of freak waves has been affirmed by observations, registrations, and severe accidents. Many publications investigated occurrence extreme waves, their characteristics impact on offshore structures, but formation process is still under discussion. One famous real world registrations so called “New Year wave,” recorded in North Sea at Draupner jacket platform January 1st, 1995. Since there only a single point registration available, it not possible to draw...

To ensure survival of floating structures in rough seas, a precise knowledge global and local loads is an inevitable integral part for safe design. One the key parameters vertical bending moment. Not only forces but — as previous investigations revealed also longitudinal significantly contribute to wave Three segmented ships, equipped with force transducers, are investigated systematically high steep regular waves harsh environments at several cruising speeds identify structural loads. The...

The paper presents experimental results from model tests with a containership advancing in abnormal wave conditions and comparisons numerical simulations. A nonlinear time domain method based on strip theory is used for the calculation of vertical ship responses induced by waves. This code combines linear diffraction radiation forces dominant associated response arising Froude-Krylov forces, hydrostatic shipping green water. simulations are compared directly records container deterministic...

Abstract The environment in cold regions undergoes significant changes that manifest rising temperatures and melting ice caps. These processes allow access to new areas for shipping the installation of structures. However, occurring are not solely a reduction ice, but also waves increasingly occur contributing break up Marginal Ice Zone (MIZ) transport towards open sea. Much work has been done combine single topic disciplines: wave-hydrodynamics, mechanics structure wave-structure (WSI)...

The accurate description of the complex genesis and evolution ocean waves, as well associated kinematics dynamics is indispensable for design offshore structures assessment marine operations. In majority cases, water-wave problem reduced to potential flow theory on a somehow simplified level. However, nonlinear terms in surface boundary conditions fact that they must be fulfilled unknown water make value considerably complex. Hereby, contrary objectives with respect very representation...

Abstract This paper presents a comprehensive experimental study on the effect of extreme waves LNG carrier. The carrier model was equipped with variety sensors to measure motions, green water height deck as well local and global loads. Experiments in transient wave packets provided general performance terms response amplitude operators were accompanied by tests regular two different steepness. These allowed detailed insights into nonlinear behavior vertical bending moment steep showing that...

Abstract The behavior of a chemical tanker (CT) in extreme waves was discussed detail, that is, terms rigid body heave and pitch motions, vertical bending moments (VBMs) amidships, green water, slamming impacts through the analysis experimental data from model tests. Regular wave tests conducted for two steepness showed increase caused asymmetry between hogging sagging contribution water on deck to decrease moments. Random uncertainty statistical values irregular with various seeds revealed...

The precise knowledge of loads and motions in extreme sea states is indispensable to ensure reliability survival ships floating offshore structures. In the last decades, several accidents severe weather with disastrous consequences have shown need for further investigations. Besides state behavior local structural loads, one key parameter safe ship design vertical bending moment. Previous investigations revealed that different criteria, such as bow geometry wave board height, affect global...