A comprehensive study on ship motion and load responses in short-crested irregular waves

Jiao, Jing; Chen, Chaohe; Ren, Huilong

doi:10.1016/j.ijnaoe.2018.07.003

Cited by 40 publications

(12 citation statements)

References 17 publications

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“…Chen et al [7] numerically investigated ship motions in long-crested and short-crested irregular waves by 3D time domain potential flow theory. Jiao et al [8] comparatively studied the wave-induced ship motion and load responses in long-and short-crested irregular waves by theoretical and experimental methods. To summarize, the existing investigations on the hydrodynamic behavior of ships in multi-directional waves are mainly conducted by potential flow theory or model experiments, while related investigation by CFD has not been found.…”

Section: Introductionmentioning

confidence: 99%

CFD Simulation of Ship Seakeeping Performance and Slamming Loads in Bi-Directional Cross Wave

Jia

Huang

2020

JMSE

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Accurate prediction of ship seakeeping performance in complex ocean environment is a fundamental requirement for ship design and actual operation in seaways. In this paper, an unsteady Reynolds-averaged Navier–Stokes (RANS) computational fluid dynamics (CFD) solver with overset grid technique was applied to estimate the seakeeping performance of an S175 containership operating in bi-directional cross waves. The cross wave is reproduced by linear superposition of two orthogonal regular waves in a rectangle numerical wave tank. The ship nonlinear motion responses, bow slamming loads, and green water on deck induced by cross wave with different control parameters such as wave length and wave heading angle are systemically analyzed. The results demonstrate that both vertical and transverse motion responses, as well as slamming pressure of ship induced by cross wave, can be quite large, and they are quite different from those in regular wave. Therefore, ship navigational safety when suffering cross waves should be further concerned.

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Section: Introductionmentioning

confidence: 99%

CFD Simulation of Ship Seakeeping Performance and Slamming Loads in Bi-Directional Cross Wave

Jia

Huang

2020

JMSE

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“…In the last decade, a large number of computational analyses concerning ship motions in waves have been published [3,4,5,6,7,8]. However, experiments at the model scale along with full-scale trials [9] are still the most accurate approaches for checking operability criteria, but the cost of model tests sometimes limits the number of considered cases. This study focuses on an experimental approach to roll motion prediction as it plays a very important role in the assessment of ship operability [2], as well as having a significant influence on ship safety during operations in severe seas [10].…”

Section: Introductionmentioning

confidence: 99%

Prediction of Ship Motions in Irregular Waves Based on Response Amplitude Operators Evaluated Experimentally in Noise Waves

Bielicki¹

2021

Polish Maritime Research

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The most common methods for predicting ship roll motions in a specified sea state are direct measurements of motions in a representative irregular wave realisation (time domain) or calculations of motions from response amplitude operators (RAOs) in the frequency domain. The result of the first method is valid only for the tested sea state, whilst the second method is more flexible but less accurate. RAO-based predictions are calculated assuming a linear model of ship motions in waves. RAO functions are usually evaluated by means of tests in regular waves for a limited number of frequencies and a constant wave amplitude. This approach is time-consuming and the discrete form of the RAO functions obtained for a limited number of frequencies may lead to discrepancies in the prediction of seakeeping and often does not allow the actual amplitude of the response in resonant frequency to be determined. Another challenge is the appropriate selection of wave amplitude for tests due to the considerable influence of viscous damping on roll response in irregular sea waves. There are alternative methods for the experimental determination of RAO functions and one of them is presented in this study. The presented approach allows RAO functions to be evaluated in one run by the generation of irregular waves characterised by a white or coloured noise spectrum. This method reduces the experiment duration, with almost continuous RAO characteristics obtained. The flat (white noise) and linear (coloured noise) wave spectral energy characteristics are considered in the experiment and the obtained predictions are compared with the results of accurate measurements in irregular waves.

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“…Naess (1990) conducted a statistical analysis of the non-linear, second-order hydrodynamic forces and motions of a tension leg platform (TLP) subjected to shortcrested waves. Jiao et al (2019) carried out towing tank tests as well as sea trials for a ship model in various wave conditions and concluded that the pitch motion and sectional loads of the ship could be over-estimated in long-crested waves compared with those in short-crested waves. Jian et al (2008) analysed the hydrodynamic forces and water run-up on a fixed vertical cylinder in short-crested waves with influences of water current.…”

Section: Introductionmentioning

confidence: 99%

Short-crestedness effect on the dynamic response of offshore floating wind turbines

Liu

2021

Ships and Offshore Structures

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Previous investigations on the performance of offshore floating wind turbines mostly adopted the long-crested wave model, which propagates along one single direction. In practice, the ocean waves are short-crested and three-dimensional.Unfortunately, the performance of offshore floating wind turbines in shortcrested waves is not fully understood. The primary objective of the present research is to form a better understanding of the dynamics of offshore floating wind turbines in multi-directional waves. The short-crested waves are modelled using a spreading exponent function. The wave directionality effect on the dynamic performance of a semisubmersible offshore floating wind turbine is studied. In short-crested wave, the longitudinal response is reduced whereas the lateral response is amplified. The tower base fore-aft bending moment and the mooring line tension force are reduced. In the meanwhile, the fatigue damages of critical points at tower base are also reduced. It is concluded that shortcrestedness is beneficial to the structural integrity. The present research reveals the importance of wave short-crestedness effect on the performance of offshore floating wind turbines.

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A comprehensive study on ship motion and load responses in short-crested irregular waves

Cited by 40 publications

References 17 publications

CFD Simulation of Ship Seakeeping Performance and Slamming Loads in Bi-Directional Cross Wave

CFD Simulation of Ship Seakeeping Performance and Slamming Loads in Bi-Directional Cross Wave

Prediction of Ship Motions in Irregular Waves Based on Response Amplitude Operators Evaluated Experimentally in Noise Waves

Short-crestedness effect on the dynamic response of offshore floating wind turbines

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