scholarly journals Study of motion sickness incidence in ship motion

2015 ◽  
Vol 18 (4) ◽  
pp. 102-109
Author(s):  
Tuan Anh Nguyen ◽  
Tat - Hien Le
Keyword(s):  
Energy Spectrum ◽  
Motion Sickness ◽  
Wave Energy ◽  
Ship Design ◽  
Ship Motion ◽  
Design Stage ◽  
Wave Energy Spectrum

Motion sickness incidence index (MSI) is one of essential issues in ship motion research to access the comfort of passenger on board cruises and yachts. In the paper, wave energy spectrum and MSI will be analyzed. Evaluation will not only provide an initial feedback of passenger’s comfort in ship design stage but also estimate the suitable speed to steer the cruise comfortably.

scholarly journals Gravitational wave energy spectrum of hyperbolic encounters

2012 ◽  
Vol 86 (4) ◽  
Author(s):  
Lorenzo De Vittori ◽  
Philippe Jetzer ◽  
Antoine Klein
Keyword(s):  
Energy Spectrum ◽  
Gravitational Wave ◽  
Wave Energy ◽  
Wave Energy Spectrum

scholarly journals Generation of 3-hr Long-Crested Waves of Extreme Sea States With HOS-NWT Solver

2020 ◽  
Author(s):  
Maxime Canard ◽  
Guillaume Ducrozet ◽  
Benjamin Bouscasse
Keyword(s):  
Energy Spectrum ◽  
Wave Energy ◽  
Wave Spectrum ◽  
Wave Structure ◽  
Spatial Discretization ◽  
Ocean Engineering ◽  
Sea State ◽  
Wave Condition ◽  
Highly Nonlinear ◽  
Wave Energy Spectrum

Abstract The accurate control of wave fields generated in experiments and numerical simulations is of great interest for the ocean engineering community. In the context of wave-structure interactions, the recommended practices of classification societies are indeed based on the definition of a wave spectrum, that needs to be reproduced. The present work intends to address this problem from the numerical point of view, using a Numerical Wave Tank equipped with a wavemaker and an absorbing beach, based on the High-Order Spectral method (HOS-NWT). The challenging case of the generation of 3-hours long-crested extreme sea states is studied in details. An iterative procedure to reproduce a target wave spectrum at a given distance from the wavemaker is proposed. The quality of the sea state obtained is evaluated using several criteria defined from spectral quantities. A validation is first performed with a highly nonlinear but non-breaking sea-state. Statistical crest distributions obtained are compared with the Forristall and Huang distributions [1,2]. Then, the Gulf of Mexico 1,000 Year Return Period wave condition is generated. This corresponds to an extreme sea state with significant wave breaking occurrence. The numerical solver needs to be able to account for this phenomenon [3]. The Tian breaking model [4, 5] is calibrated to realistically reproduce the dissipation due to breaking, with particular attention paid to the spatial discretization, enlightening its significant effect on breaking model actions. Consequences on the iterative correction process are studied. The computed statistical quantities appear to be significantly different changing the spatial discretization, while the wave energy spectrum stands the same. It questions the relevance of the characterization of a sea state with the sole wave energy spectrum.

Optimized design of 3-DOF buoy wave energy converters under a specified wave energy spectrum

2021 ◽  
Vol 116 ◽  
pp. 102885
Author(s):  
Ji Tao ◽  
Feifei Cao ◽  
Xiaochen Dong ◽  
Demin Li ◽  
Hongda Shi
Keyword(s):  
Energy Spectrum ◽  
Wave Energy ◽  
Optimized Design ◽  
Wave Energy Converters ◽  
Wave Energy Spectrum ◽  
Energy Converters

Launching Dynamics Simulation of Ship-Board Rocket Gun

2012 ◽  
Vol 625 ◽  
pp. 140-145
Author(s):  
Wei Zeng ◽  
Yi Jiang
Keyword(s):  
Energy Spectrum ◽  
Dynamic Response ◽  
Spectral Density ◽  
Wave Energy ◽  
Dynamics Simulation ◽  
Irregular Waves ◽  
Dynamics Model ◽  
Energy Spectral Density ◽  
Ocean Wave Energy ◽  
Wave Energy Spectrum

As for the issue of ship-board rocket gun launch, the research on the influence of sea condition on initial disturbances of rockets was conducted. The launch system was simplified and the dynamics model was established. The energy spectral density of motion of ship in irregular waves was calculated based on ocean wave energy spectrum and the dynamic response of launch system was studied under three kinds of sea conditions. The result indicates that amplitudes of pitch and yaw increase, however, the rolling decreases when the sea condition level rises.

scholarly journals Diffusion of inertia-gravity waves by geostrophic turbulence

2019 ◽  
Vol 869 ◽  
Author(s):  
Hossein A. Kafiabad ◽  
Miles A. C. Savva ◽  
Jacques Vanneste
Keyword(s):  
Energy Spectrum ◽  
Gravity Waves ◽  
Wave Energy ◽  
Large Scale ◽  
Three Dimensional ◽  
Boussinesq Equations ◽  
Constant Frequency ◽  
Geostrophic Turbulence ◽  
Wave Energy Spectrum ◽  
Inertia Gravity Waves

The scattering of inertia-gravity waves by large-scale geostrophic turbulence in a rapidly rotating, strongly stratified fluid leads to the diffusion of wave energy on the constant-frequency cone in wavenumber space. We derive the corresponding diffusion equation and relate its diffusivity to the wave characteristics and the energy spectrum of the turbulent flow. We check the predictions of this equation against numerical simulations of the three-dimensional Boussinesq equations in initial-value and forced scenarios with horizontally isotropic wave and flow fields. In the forced case, wavenumber diffusion results in a $k^{-2}$ wave energy spectrum consistent with as-yet-unexplained features of observed atmospheric and oceanic spectra.

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