上海交通大学学报

上海交通大学学报 ›› 2020, Vol. 54 ›› Issue (1): 20-27.doi: 10.16183/j.cnki.jsjtu.2020.01.003

• 学报（中文） • 上一篇    下一篇

应用改进流体体积法的楔形体斜向入水研究

谢行1,2，任慧龙1，陶凯东1，冯亿坤1   

  1. 1. 哈尔滨工程大学 船舶工程学院， 哈尔滨 150001； 2. 黄淮学院 智能制造学院， 河南 驻马店 463000
  • 出版日期:2020-01-28 发布日期:2020-01-16
  • 通讯作者: 任慧龙，男，教授，博士生导师，电话(Tel.)：0451-82519650；E-mail：renhuilong@hrbeu.edu.cn.
  • 作者简介:谢行(1992-)，男，河南省驻马店市人，副教授，现主要从事结构水动力学分析和智能计算方法研究.
  • 基金资助:
    国家自然科学基金资助项目(51679049, 51709030)，河南省科技厅攻关项目(182102210099)

Study on Oblique Water Entry of Wedge Applying Improved Volume of Fluid Method

XIE Hang 1,2,REN Huilong 1,TAO Kaidong 1,FENG Yikun 1   

  1. 1. College of Shipbuilding Engineering, Harbin Engineering University, Harbin 150001, China; 2. School of Intelligent Manufacturing, Huanghuai University, Zhumadian 463000, Henan, China
  • Online:2020-01-28 Published:2020-01-16

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摘要： 为了精确追踪入水冲击中含有气体的自由面，在现有流体体积(VOF)法中引入连续表面张力(CSF)模型对气-液界面处压力进行连续化处理，添加对流项以减少体积分数的数值耗散，并耦合水平集函数保证自由表面的尖锐性.应用改进的VOF法对多个倾斜角下楔形体的入水过程进行数值模拟，并分析了砰击压力和自由面特性.研究表明：在保证相同自由面分辨率的情况下，改进的VOF法能减少1/3的网格数量；数值结果较好地反映了斜向入水过程中出现的空气流通现象，砰击压力峰值与实验值吻合良好；当底升角小于10° 时出现明显气穴效应，数值结果与实验值相差10%，而解析解的误差达到40%，说明气穴对砰击压力具有重要影响，改进的VOF法对解决这类入水问题具有精度高的优势.

关键词: 流体体积法； 斜向入水； 计算流体动力学； 气-液两相流； 砰击载荷

Abstract: Some improvements based on volume of fluid (VOF) method were done to exactly track the free surface with air pocket during the water entry. A continuum surface force (CSF) model was introduced to serialize the pressure on the interface of air and water. A convective term was added to minimize the numerical dissipation of volume fraction, and the level-set function was coupled to keep the sharpness of free surface. Oblique water entry problems of wedge with various inclination angles were simulated numerically based on the improved VOF method, and the characteristics of pressure and free surface were analyzed. The research shows that the free surface can be exactly reconstructed, and the same resolution can be realized in the improved VOF method through reducing 1/3 total number of mesh. The cavitation during oblique water entry is better reflected by the numerical simulation, and the slamming pressure peak agrees well with the published experimental data. When the deadrise angle is below 10°, an obvious air effect will appear. The error between numerical and experimental results is 10%, while it reaches up to 40% in the analytical solution. The results suggest that the air greatly influences the slamming pressure and the numerical high-precision results can be obtained through the improved VOF method.

Key words: volume of fluid (VOF) method; oblique water entry; computational fluid dynamics; gas-liquid two-phase flow; slamming loads

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