谱尾对随机海峰度演化的影响

IF 1.3 4区 工程技术 Q3 ENGINEERING, MECHANICAL
D. Barratt, T. S. van den Bremer, Thomas A. A. Adcock
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引用次数: 2

摘要

我们基于具有方向扩展的窄带谱对随机海进行模拟。我们的波场在空间上是均匀的,在时间上是非平稳的。我们截断了不同截止波数下初始条件下的谱尾,以评估谱尾对峰度和谱演化的影响。我们考虑两种基于在k/kp=2.4和k/kp=6处波数尾的截断的情况。我们的模拟表明,如果尾部在|k|/kp=2.4而不是k/kp=6处截断,则峰值峰度值会增加。对于波数截止为k/kp=2.4的情况,峰度增加伴随着相对更积极的光谱变化,包括光谱尾部的再开发。在波数截止值为|k|/kp=6的情况下观察到类似的趋势,但光谱变化不那么显著。因此,光谱尾部似乎在减少光谱变化并降低峰值峰度值的光谱平衡形式中发挥着重要作用。我们的研究结果表明,为了模拟/实验的目的,在截断光谱尾部时应该小心。我们还发现Fedele方程(2015,\textit{J.Fluid Mech.},第782卷,第25-36页)提供了峰度峰值的极好估计。然而,带宽参数必须考虑到谱尾,以提供峰值峰度的精确估计。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The impact of the spectral tail on the evolution of the kurtosis of random seas
We perform simulations of random seas based on narrow-banded spectra with directional spreading. Our wavefields are spatially homogeneous and non-stationary in time. We truncate the spectral tail for the initial conditions at different cut-off wavenumbers to assess the impact of the spectral tail on the kurtosis and spectral evolution. We consider two cases based on truncation of the wavenumber tail at k/kp = 2.4 and k/kp = 6. Our simulations indicate that the peak kurtosis value increases if the tail is truncated at |k|/kp = 2.4 rather than k/kp = 6. For the case with a wavenumber cut-off at k/kp = 2.4, augmented kurtosis is accompanied by comparatively more aggressive spectral changes including redevelopment of the spectral tail. Similar trends are observed for the case with a wavenumber cut-off at |k|/kp = 6, but the spectral changes are less substantial. Thus, the spectral tail appears to play an important role in a form of spectral equilibrium that reduces spectral changes and decreases the peak kurtosis value. Our findings suggest that care should be taken when truncating the spectral tail for the purpose of simulations/experiments. We also find that the equation of Fedele (2015, \textit{J. Fluid Mech.}, vol. 782, pp. 25--36) provides an excellent estimate of the peak kurtosis value. However, the bandwidth parameter must account for the spectral tail to provide accurate estimates of the peak kurtosis.
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来源期刊
CiteScore
4.20
自引率
6.20%
发文量
63
审稿时长
6-12 weeks
期刊介绍: The Journal of Offshore Mechanics and Arctic Engineering is an international resource for original peer-reviewed research that advances the state of knowledge on all aspects of analysis, design, and technology development in ocean, offshore, arctic, and related fields. Its main goals are to provide a forum for timely and in-depth exchanges of scientific and technical information among researchers and engineers. It emphasizes fundamental research and development studies as well as review articles that offer either retrospective perspectives on well-established topics or exposures to innovative or novel developments. Case histories are not encouraged. The journal also documents significant developments in related fields and major accomplishments of renowned scientists by programming themed issues to record such events. Scope: Offshore Mechanics, Drilling Technology, Fixed and Floating Production Systems; Ocean Engineering, Hydrodynamics, and Ship Motions; Ocean Climate Statistics, Storms, Extremes, and Hurricanes; Structural Mechanics; Safety, Reliability, Risk Assessment, and Uncertainty Quantification; Riser Mechanics, Cable and Mooring Dynamics, Pipeline and Subsea Technology; Materials Engineering, Fatigue, Fracture, Welding Technology, Non-destructive Testing, Inspection Technologies, Corrosion Protection and Control; Fluid-structure Interaction, Computational Fluid Dynamics, Flow and Vortex-Induced Vibrations; Marine and Offshore Geotechnics, Soil Mechanics, Soil-pipeline Interaction; Ocean Renewable Energy; Ocean Space Utilization and Aquaculture Engineering; Petroleum Technology; Polar and Arctic Science and Technology, Ice Mechanics, Arctic Drilling and Exploration, Arctic Structures, Ice-structure and Ship Interaction, Permafrost Engineering, Arctic and Thermal Design.
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