基于等温伪势格子Boltzmann方法模拟精度提高的研究  

Investigation on Improvement of Simulation Accuracy Based on Isothermal Pseudo-Potential Lattice Boltzmann Method

作　　者：杨建华 高明[1] 陶莹 党梦媛 曾柏淋 

机构地区：[1]上海理工大学能源与动力工程学院,上海

出　　处：《建模与仿真》2023年第3期2887-2897,共11页Modeling and Simulation

摘　　要：采用单组分多相格子Boltzmann方法研究单液滴在等温基板上蒸发时,在壁面边界附近施加虚拟流体层来提高模拟精度是十分必要的。本文采用基于伪势法的流固作用模型,结合构造虚拟流体层的不同方法,研究了不同接触角方案对模拟过程中产生的最大虚假速度和近壁面流体密度偏差的影响,结果表明:基于伪势法构造流固作用力,当液滴接触角θ < 120˚时,采用复制流体密度法构建虚拟流体层会产生最小的虚假速度和密度偏差,且存在密度偏差为0的最佳接触角,是较为理想的构建虚拟流体层,提高模拟精度的接触角方案。It is necessary to apply a ghost fluid layer near the wall boundary to improve the simulation accu-racy of the single-component multiphase lattice Boltzmann method for the evaporation of a single droplet on an isothermal substrate. In this paper, the fluid-solid interaction model based on pseu-do-potential method is used, and the effects of different contact angle schemes on the maximum spurious velocity and the near-solid fluid density deviation are studied in combination with differ-ent methods of constructing the ghost fluid layer. The results show that: The pseudo potential method was used to construct the fluid-solid force, when the droplet contact angle θ < 120˚, the du-plicated fluid density method can produce the smallest spurious velocity and density deviation, and there is an optimal contact angle with zero density deviation. It is an ideal contact angle scheme to construct the ghost fluid layer and improve the simulation accuracy.

关 键 词：格子BOLTZMANN方法 流体密度 模拟精度 液滴接触角 密度偏差 单液滴 模拟过程 

分 类 号：TP3[自动化与计算机技术—计算机科学与技术]