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Numerical investigation of water entry of a wedge into waves with current effects using a fully nonlinear HOBEM

机译：利用完全非线性HOBEM对楔形水进入具有电流效应的波浪的数值研究

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摘要

This paper concerns the hydrodynamic performance of a two-dimensional asymmetric wedge entering waves obliquely with gravity effect in the presence of a uniform current. A time-domain higher-order boundary element method (HOBEM) based on potential theory with fully nonlinear boundary conditions is developed to solve this problem. A stretched coordinate system is adopted in the spatial domain to avoid a large number of elements discretized in fixed computational domain at the initial stage. During mesh regriding and interpolation, a rotation scheme of the stretched coordinate system is employed to meet the requirement of continuity of flux at the intersection points. An auxiliary function is introduced to calculate pressure distribution on body surface. The present model is validated against the published numerical results for vertical wave entry in the absence of currents. Numerical calculations are conducted to analyze the dependence of the free surface elevation and the pressure distribution on the physical parameters, such as current velocity, incident wave amplitude, entry location, heel angle and oblique motion. It is found that the variation of current velocity has obvious effect on both the horizontal velocity of fluid and the wave steepness, which play a major role on free surface and pressure.
机译：本文研究了在均匀电流作用下，二维非对称楔形楔形波在重力作用下倾斜进入水波的流体力学性能。为解决这一问题，提出了一种基于势能理论的时域高阶边界元方法（HOBEM）。在空间域中采用拉伸坐标系，以避免在初始阶段在固定计算域中离散大量元素。在网格再网格化和插值过程中，采用拉伸坐标系的旋转方案来满足交点处通量连续性的要求。引入了一个辅助函数来计算体表上的压力分布。在没有电流的情况下，针对已发布的垂直波进入的数值结果对本模型进行了验证。进行了数值计算，以分析自由表面高度和压力分布对物理参数（如电流速度，入射波幅度，进入位置，横倾角和倾斜运动）的依赖性。研究发现，流速的变化对流体的水平速度和波速都具有明显的影响，这对自由表面和压力起着重要的作用。

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  • 来源
    《Ocean Engineering》 |2018年第1期|33-52|共20页
  • 作者

    Cheng Yong; Ji Chunyan; Zhai Gangjun; Oleg Gaidai;

  • 作者单位

    Jiangsu Univ Sci & Technol, Sch Naval Architecture & Ocean Engn, Zhenjiang 212003, Peoples R China;

    Jiangsu Univ Sci & Technol, Sch Naval Architecture & Ocean Engn, Zhenjiang 212003, Peoples R China;

    Dalian Univ Technol, Deepwater Engn Res Ctr, Dalian 116024, Peoples R China;

    Norwegian Univ Sci & Technol, Ctr Ships & Ocean Struct, NO-7491 Trondheim, Norway;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    HOBEM; Wave-current interaction; Water entry; Fully nonlinear; Asymmetric wedge;

    机译：HOBEM;波流相互作用;进水;完全非线性;不对称楔形;

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