考虑流场黏性的气泡与自由液面作用的数值模拟  

Numerical simulation of interaction between bubble and free surface considering flow field viscosity

作　　者：王加夏 伍师增 刘昆[1] 朱方杰 王禹凯 WANG Jiaxia;WU Shizeng;LIU Kun;ZHU Fangjie;WANG Yukai(School of Naval Architecture and Ocean Engineering,Jiangsu University of Science and Technology,Zhenjiang 212100,China;Shanghai Marine Equipment Research Institute,Shanghai 200031,China)

机构地区：[1]江苏科技大学船舶与海洋工程学院,江苏镇江212100 [2]上海船舶设备研究所,上海200031

出　　处：《中国舰船研究》2024年第3期106-114,共9页Chinese Journal of Ship Research

基　　金：国家自然科学基金资助项目(52171311,52271279);江苏省自然科学基金资助项目(BK20220652)。

摘　　要：[目的]旨在探究计入可压缩性和黏性效应流场中水下爆炸气泡与自由液面相互作用时液面水冢的演化规律。[方法]首先,基于OpenFOAM的可压缩两相流求解器和流体体积法(VOF),建立计入流场可压缩性和黏性效应的水下爆炸气泡与自由液面耦合作用的数值模型;然后,通过与试验结果进行对比,验证数值模型的有效性;最后,研究不同流场黏性和不同距离参数对气泡脉动过程及液面水冢运动的影响。[结果]结果显示,流场黏性效应对于水冢高度、气泡脉动周期、气泡脉动尤其是反弹阶段的气泡形态均有重要影响;低黏度流体中环状气泡形态不易于保持,易出现环状气泡的撕裂现象;随着距离参数的增大,自由表面和气泡之间的耦合效应逐渐减弱,气泡脉动周期增大,主峰和二次水冢尖峰的高度减小,同时主峰和射流的宽度逐渐增大。[结论]所做研究可为气泡在不同黏性流场中的演变机理提供参考。[Objective]This study investigates the evolution of the interaction between an underwater explo-sion bubble and the free liquid surface in terms of compressibility and viscous effect.[Methods]A numeric-al model of an underwater explosion bubble coupled with the free liquid surface is developed on the basis of the compressible two-phase flow solver of OpenFOAM and the volume of fluid method(VOF).The validity of the numerical model is then verified by comparison with the experimental results.The effects of different flow field viscosities and distance parameters on the bubble pulsation process and free-surface spike motion are also investigated.[Results]The flow field viscosity effect has an important influence on the surface spike height,bubble pulsation period and bubble pulsation,especially the bubble morphology in the rebound phase.Ring bubble morphology is not easy to maintain in low viscosity fluid,so the tearing phenomenon of the bubble can easily occur.As the distance parameter increases,the coupling effect between the free surface and the bubble gradually decreases,the bubble pulsation period increases,the heights of the primary and second-ary surface spikes decrease,and the widths of the primary spike and liquid jet gradually increase.[Conclusion]The results of this study can provide useful references for determining the evolution mechan-ism of bubbles under different flow field viscosities.

关 键 词：水下爆炸气泡 自由液面 流场黏性 距离参数 液面水冢 

分 类 号：U674.941[交通运输工程—船舶及航道工程]