基于LBM方法的圆盘等速入水空泡的数值模拟  

Numerical simulation of constant speed water-entry cavity based on LBM

作　　者：张珂[1] 颜开[1] 褚学森[1] 程贯一[1] 

机构地区：[1]中国船舶科学研究中心,江苏无锡214082

出　　处：《船舶力学》2010年第10期1129-1133,共5页Journal of Ship Mechanics

摘　　要：采用单相格子Boltzmann模型进行了物体垂直入水问题的研究。该模型适用于大密度比的气液两相流动,其特点是忽略了系统中气相对液相的动力学影响。模拟了圆盘垂直等速入水过程,给出了入水过程中空泡与自由面的变化规律,研究了圆盘入水空泡相对闭合深度与Froude数之间的关系。数值模拟结果与相关的实验结果吻合良好,验证了格子Boltzmann方法(LBM:Lattice Boltzmann Method)模拟物体入水问题的可行性。A single phase free surface lattice Boltzmann model is implemented to the simulation of the process of body entering water vertically.The single-phase model,which is characterized by neglecting the in-fluence of the gas phase to the liquid phase in the system,is applied as it is mostly valid for the gas-liquid two-phase flow with high density ratio.A three dimensional disk entering water vertically at constant speed is simulated.The process of the interaction of cavity with free surface and the relationship between the relative depth of cavity closure and the Froude number are studied.The numerical results agree well with the experimental results,showing that the single-phase model of the LBM is applicable to the simulation of water-entry.

关 键 词：入水空泡 数值模拟 格子Boltzmann方法(LBM) 自由面流动 

分 类 号：U661.1[交通运输工程—船舶及航道工程]