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Numerical simulation of water impact of solid bodies with vertical and oblique entries

机译：具有垂直和倾斜入口的固体水冲击的数值模拟

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摘要

The flow problem of hydrodynamic impact during water entry of solid objects of various shapes and configurations is simulated by a two-fluid free surface code based on the solution of the Navier-Stokes equations (NSE) on a fixed Cartesian grid. In the numerical model the free surface is captured by the level set function, and the partial cell method combined with a local relative velocity approach is applied to the simulation of moving bodies. The code is firstly validated using experimental data and other numerical results in terms of the impact forces and surface pressure distributions for the vertical entry of a semi-circular cylinder and a symmetric wedge. Then configurations of oblique water entry of a wedge are simulated and the predicted free surface profiles during impact are compared with experimental results showing a good agreement. Finally, a series of tests involving vertical and oblique water entry of wedges with different heel angles are simulated and the results compared with published numerical results. It is found that the surface pressure distributions and forces predicted by the present model generally agree very well with other numerical results based on the potential flow theory. However, as the current model is based on the solution of the NSE, it is more robust and can therefore predict, for example, the formation and separation of the thin flow jets (spray) from surface of the wedge and associated ventilation phenomena for the cases of oblique water entry when the horizontal velocity is dominant. It is also noted that the potential flow theory can result in over-estimated negative pressures at the tip of the wedge due to its inherent restriction to nonseparated flows.
机译：通过在固定笛卡尔网格上基于Navier-Stokes方程（NSE）的解，通过双流体自由表面代码模拟了各种形状和构造的固体物体入水期间的流体动力冲击流动问题。在数值模型中，自由曲面由水平集函数捕获，并且将局部单元方法与局部相对速度方法相结合应用于运动体的仿真。该代码首先使用实验数据和其他数值结果进行验证，以用于半圆形圆柱体和对称楔块的垂直进入的冲击力和表面压力分布。然后，模拟了楔形水进入斜面的构型，并将在撞击过程中预测的自由表面轮廓与实验结果进行了比较，表明吻合良好。最后，模拟了一系列测试，这些测试涉及具有不同后倾角的楔子的垂直和倾斜进水，并且将结果与公开的数值结果进行了比较。可以发现，本模型预测的表面压力分布和作用力通常与基于势流理论的其他数值结果非常吻合。但是，由于当前模型基于NSE的解决方案，因此它更加健壮，因此可以预测例如楔形表面细流射流（喷雾）的形成和分离以及与之相关的通风现象。水平速度占主导的倾斜水进入的情况。还应注意的是，由于潜在的流动理论固有地限制了不可分离的流动，因此潜在的流动理论可能会在楔形的尖端导致高估的负压。

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  • 来源
    《Ocean Engineering》 |2014年第1期|128-137|共10页
  • 作者

    H.B. Gu; L. Qian; D.M. Causon; C.G. Mingham; P. Lin;

  • 作者单位

    Centre for Mathematical Modelling and Flow Analysis, School of Computing, Mathematics and Digital Technology, The Manchester Metropolitan University, Manchester M1 5GD, UK;

    Centre for Mathematical Modelling and Flow Analysis, School of Computing, Mathematics and Digital Technology, The Manchester Metropolitan University, Manchester M1 5GD, UK;

    Centre for Mathematical Modelling and Flow Analysis, School of Computing, Mathematics and Digital Technology, The Manchester Metropolitan University, Manchester M1 5GD, UK;

    Centre for Mathematical Modelling and Flow Analysis, School of Computing, Mathematics and Digital Technology, The Manchester Metropolitan University, Manchester M1 5GD, UK;

    State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Water impact; Vertical and oblique water entry; Two-phase flow; Level set; Free-surface; Partial cell; Local relatively stationary method; Moving body;

    机译：水影响;垂直和倾斜进水;两相流;水平设置;自由表面部分细胞;局部相对平稳的方法;移动体;

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