基于格子Boltzmann的混合过程建模与流致振动特性  

Mixing process modeling and flow-induced vibration characteristics based on lattice Boltzmann method

作　　者：尹亚星 王彤 王承彦 张彦康 徐仕承 谭大鹏[1] YIN Ya-xing;WANG Tong;WANG Cheng-yan;ZHANG Yan-kang;XU Shi-cheng;TAN Da-peng(College of Mechanical Engineering,Zhejiang University of Technology,Hangzhou 310014,China)

机构地区：[1]浙江工业大学机械工程学院,浙江杭州310014

出　　处：《浙江大学学报（工学版）》2023年第11期2217-2226,共10页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(52175124);浙江省重点科学基金资助项目(LZ21E050003).

摘　　要：为了探究静态混合过程中的内流冲击与流致振动特性,提出结合大涡模拟(LES)方法的介观多速度分量格子Boltzmann流固耦合模型.针对静态混合过程伴随强剪切、回流反冲、壁面冲击等特点,以静态混合器为研究对象,对静态混合过程建模,并提出流场-结构场弱耦合求解策略.通过此方法研究静态混合器不同位置位移形变、不同入口速度和不同静态混合器叶片夹角对管壁振动响应的影响.结果表明,叶片作用可以将流体轴向速度转换为切向和径向速度;在入口流速相对较大时,内部流场对静态混合器的振动频率及振幅的影响较为明显;改变混合叶片夹角,会影响流场剪切引流作用,对其纵向位移和轴向位移影响显著,且主要影响低频段.The mesoscopic multi-velocity component lattice Boltzmann fluid-structure interaction model,combined with the large eddy simulation(LES)method,was proposed in order to investigate the in-flow shock and flowinduced vibration characteristics during static mixing.The aim is to explore the static mixing process,including characteristics such as strong shear,backflow recoil,wall impact,and other factors.Taking static mixer as the research object,the model of static mixing process was established,and the weak coupling solution strategy of flow field and structure field was proposed.The proposed method was used to study the effects of different displacement deformations,different inlet velocities and different static mixer blade angles on the vibration response of the tube wall.Results show that blade action can convert the axial velocity of the fluid into tangential and radial velocity.When the inlet velocity is relatively large,the internal flow field has obvious influence on the vibration frequency and amplitude of the static mixer.Changing the mixer blade angle will affect the shear drainage effect of the flow field,and has significant effects on the longitudinal and axial displacement,mainly in the low frequency band.

关 键 词：静态混合 格子Boltzmann方法(LBM) 流固耦合 强剪切 流致振动 

分 类 号：O353.4[理学—流体力学]