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虚拟流体方法在自由面流动问题中的应用

Application of Ghost Fluid Method in Free Surface Flow
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摘要 在诸如大密度比的水-气两相流动问题中,压力在自由面处不连续。传统的模拟方法难以处理压力跳跃条件,使得自由面处的压力梯度计算不准确,并出现虚假速度。论文基于开源代码平台OpenFOAM,在船海水动力学求解器naoe-FOAM-SJTU中引入虚拟流体方法,自主开发了适用于大密度比两相流动的压力-速度修正模块,并将其与VOF方法相结合,在非结构化网格上准确模拟压力跳跃条件。斜坡流动和波浪传播问题中的计算结果表明,采用虚拟流体方法能在自由面处获得清晰的压力突变,并能有效改善界面附近存在虚假速度的状况。 In two phase flow with large density ratio such as water-air two phase flow,dynamic pressure is discontinuous at the free surface,and a pressure jump is resulted in.Traditional methods for simulating two phase flow are difficult to deal with the pressure jump condition,and will lead to an incorrect calculation of the dynamic pressure gradient and inevitable occurrence of spurious velocities at the free surface.In order to solve this problem,based on the open-source platform OpenFOAM,this paper introduces the ghost fluid method into the marine hydrodynamics solver naoe-FOAM-SJTU,and develops a pressure-velocity correction module independently for two phase flow with large density ratio.Combined with the VOF method,accurate simulation of the pressure jump is achieved on arbitrary polyhedral unstructured meshes.In applications of typical two-dimensional ramp flow and wave propagation,accuracy of the developed module is validated.The results show that the ghost fluid method can obtain a sharp distribution of dynamic pressure at the free surface and reduce spurious velocities effectively.
作者 陈松涛 赵伟文 万德成 CHEN Songtao;ZHAO Weiwen;WAN Decheng(Computational Marine Hydrodynamics Lab(CMHL),School of Naval Architecture,Ocean and Civil Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)
出处 《中国造船》 EI CSCD 北大核心 2022年第4期159-166,共8页 Shipbuilding of China
基金 国家重点研发计划项目(2019YFB1704200) 国家自然科学基金项目(52131102,51879159)。
关键词 虚拟流体方法 大密度比 自由面流动 压力跳跃条件 软件naoe-FOAM-SJTU ghost fluid method large density ratio free surface flow pressure jump condition software naoe-FOAM-SJTU
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