Study on the validity of wave prediction models by direct numerical simulations

直接数值模拟研究波浪预测模型的有效性

基本信息

  • 批准号:
    15540419
  • 负责人:
  • 金额:
    $ 1.73万
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
  • 财政年份:
    2003
  • 资助国家:
    日本
  • 起止时间:
    2003 至 2005
  • 项目状态:
    已结题

项目摘要

It has become possible to perform routinely numerical wave forecast with practically sufficient accuracy. But much of this success owes the parameterizations of the models based on huge amount of data acquired by in situ observations and satellite remote-sensing, and it does not necessarily mean the success of elucidating all the basic mechanisms that are relevant to the evolution of the ocean wave spectrum. This project aims at investigating the validity of various assumptions and hypothesis included in the present-day wave forecasting models through comparative study with large-scale direct numerical simulations.We first performed a series of direct numerical simulations of the wave fields without input from wind or dissipation due to breaking to detect the change of spectrum due to nonlinear interactions among component waves, and found that the rate of change of the spectrum which the direct simulations gives agrees quite well with the prediction by wave forecast models. This apparently supports the validity of the wave forecast models. However, the fact that the rate of the change of the spectrum was observed at every instant of time in a rather short-term deterministic evolution seems to throw some doubt on the way of derivation of the nonlinear term of the wave forecast models which are currently accepted, and further investigation should be necessary.With regard to the dissipation due to breaking, we have newly developed a simple but efficient model which can be built in the deterministic direct numerical simulations. When applied to random wave fields with JONSWAP or P-M spectrum, the model was found to generate a dissipation spectrum which agrees fairly well with the standard model employed by the WAM model. Application of this model to various studies, such as the effect of breaking on the wave-height distributions is now underway. As a byproduct of this study, we also investigated the phenomenon of freak waves and obtained various interesting results.
它已成为可能进行日常数值波浪预报实际上足够的精度。但这一成功很大程度上归功于基于大量现场观测和卫星遥感数据的模式参数化,并不一定意味着成功地阐明了与海浪谱演化相关的所有基本机制。本研究旨在通过与大尺度直接数值模拟的对比研究,考察目前波浪预报模型中各种假设和假设的有效性。首先,我们对无风输入或破碎耗散的波浪场进行了一系列直接数值模拟,以检测由于分量波之间的非线性相互作用引起的谱变化,并发现直接模拟所得的谱变化率与波浪预报模式的预报相当吻合。这显然支持海浪预报模型的有效性。然而,在相当短的时间内,在每一时刻都观察到谱的变化率的确定性演变,这一事实似乎对目前公认的波浪预报模式的非线性项的推导方法提出了一些疑问,需要进一步的研究。我们最近开发了一个简单而有效的模型,可以建立在确定性的直接数值模拟。当应用于JONSWAP或P-M谱的随机波场时,发现该模型产生的耗散谱与WAM模型所采用的标准模型相当吻合。该模型在破碎对波高分布的影响等各种研究中的应用正在进行中。作为这项研究的副产品,我们还研究了畸形波的现象,并获得了各种有趣的结果。

项目成果

期刊论文数量(34)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Numerical study on the relation between the occurrence probability of freak waves and the nonlinearity
畸形波发生概率与非线性关系的数值研究
  • DOI:
  • 发表时间:
    2005
  • 期刊:
  • 影响因子:
    0
  • 作者:
    田中光宏;佐藤寛之;田中光宏;M.Tanaka;田中光宏;M.Tanaka
  • 通讯作者:
    M.Tanaka
Development of a simple numerical model for breaking of surface water waves
开发用于破坏表面水波的简单数值模型
水面波の砕波に対する簡便な数値モデルの開発に向けて
开发一个简单的破碎水波数值模型
On the effects of discretization of the spectrum in numerical study of water wave turbulence
水波湍流数值研究中频谱离散化的影响
  • DOI:
  • 发表时间:
    2004
  • 期刊:
  • 影响因子:
    0
  • 作者:
    M.Tanaka;N.Yokoyama
  • 通讯作者:
    N.Yokoyama
Effects of nonlinearity on the occurrence probability of freak waves
非线性对畸形波发生概率的影响
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TANAKA Mitsuhiro其他文献

TANAKA Mitsuhiro的其他文献

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{{ truncateString('TANAKA Mitsuhiro', 18)}}的其他基金

Elucidation of the occurrence mechanism of freak waves via strongly nonlinear wave group solutions
通过强非线性波群解阐明畸形波的发生机制
  • 批准号:
    21540451
  • 财政年份:
    2009
  • 资助金额:
    $ 1.73万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)

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Investigation of the influence of the mechanism of freak wave generation on the vertical bending response of a ship
畸形波产生机理对船舶垂向弯曲响应影响的研究
  • 批准号:
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关注波浪非线性的畸形波中船舶横摇运动研究
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    15K18295
  • 财政年份:
    2015
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Observational study to determine the causes of the freak wave generation in the open ocean
确定公海异常波产生原因的观测研究
  • 批准号:
    20676008
  • 财政年份:
    2008
  • 资助金额:
    $ 1.73万
  • 项目类别:
    Grant-in-Aid for Young Scientists (S)
Study on forecast and evading of Freak wave
畸形波预报与规避研究
  • 批准号:
    19106016
  • 财政年份:
    2007
  • 资助金额:
    $ 1.73万
  • 项目类别:
    Grant-in-Aid for Scientific Research (S)
Development of freak wave prediction method
畸形波预测方法的发展
  • 批准号:
    19360225
  • 财政年份:
    2007
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Impact Failure Limit against Freak Wave and Development of the Collision-Avoidance System
反常波冲击失效极限及防撞系统的研制
  • 批准号:
    16206082
  • 财政年份:
    2004
  • 资助金额:
    $ 1.73万
  • 项目类别:
    Grant-in-Aid for Scientific Research (A)
北太平洋におけるFREAK WAVEの解明と克服のための基礎研究
阐明和克服北太平洋异常波浪的基础研究
  • 批准号:
    16636024
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    2004
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