基于LBM的方柱流固耦合数值研究

Numerical study on fluid-structure interaction of square cylinder based on Lattice Boltzmann method

本文采用浸入边界-格子玻尔兹曼法,基于Fortran语言,结合OpenMP并行算法编写程序。计算了静止方柱绕流的升阻力系数及流场形态,将计算结果与已有文献对比。对带弹性支承的方柱振动进行了数值模拟,并将模拟结果与Fluent对比。研究低雷诺数下(Re=100),带弹性支承方柱的流固耦合振动情况,通过分析方柱的振幅和升力系数,探讨了方柱振动响应随折减速度(Ur)的变化规律,以及周围流场的流态的变化情况。

In this paper,Immersed boundary-lattice Boltzmann method(IB-LBM)is used to simulate the vibration of a rectangular square cylinder with elastic support based on Fortran and OpenMP parallel algorithm.The lift and drag coefficient of flow around stationary square cylinder and the flow field are calculated and compared with the previous literature.The vibration of square cylinder with elastic support is numerically simulated,and the simulation results are compared with those of Fluent.Then,the fluid-structure interaction vibration of a square cylinder with elastic support at low Reynolds number(Re=100)is studied.By analyzing the amplitude and lift coefficient of the square cylinder,the vibration response of the square cylinder with the reduced velocity(Ur),the flow patterns of the surrounding flow field are discussed.