Numerical analysis of vortex-induced motion of two-dimensional circular cylinder by lattice Boltzmann method
Numerical analysis of vortex-induced motion of two-dimensional circular cylinder by lattice Boltzmann method
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DOI：
10.1007/s00773-015-0365-7
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发表时间：
2016-01
影响因子：
2.6
通讯作者：
S. Hirabayashi
中科院分区：
文献类型：
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作者：
S. Hirabayashi
采用格子玻尔兹曼法对二维圆柱体的涡激运动进行了数值分析。与传统方法将计算网格拟合到实体上不同，本方法采用矩形网格，并通过边界条件处理实体的运动，以简化计算。通过对圆柱体表面上的流体动量进行积分来估计作用在圆柱体上的流体动力。对于Re=500的固定圆柱体，仿真结果得到了定量验证。当圆柱体仅在展向方向移动时，涡旋脱落频率与弹簧阻尼力固有频率之间的共振得到证实。当固有频率大于涡旋脱落频率时，会出现二次模态，这可能是非线性效应造成的。最后，考虑了流向和翼展方向的运动，并论证了水平方向的圆柱体运动特性与系泊阻尼力的关系。尽管本研究的目标仅限于二维和低Re，但格子玻尔兹曼方法对涡激运动的适用性得到了证实。
Vortex-induced motion of two-dimensional circular cylinder was numerically analyzed by using the lattice Boltzmann method. Unlike conventional methods, in which the computational grids are fit to the solid body, the present method adopts rectangular grids and the movement of the solid body was treated by the boundary condition for the simplicity of computation. The hydrodynamic force acting on the cylinder was estimated by integrating the momentum of the fluid over the cylinder surface. The quantitative validation of the simulation results was confirmed for the fixed cylinder atRe= 500. When the cylinder is allowed to move only in the spanwise direction, the resonance between the vortex-shedding frequency and the natural frequency of damping force by spring was confirmed. When the natural frequency is larger than the vortex-shedding frequency, secondary mode appears which may be resulted from the nonlinear effect. Finally, the motion in the streamwise direction is considered as well as the spanwise direction and the characteristic of the cylinder motion in the horizontal direction was demonstrated in relation to the damping force by the mooring. Although the target of the present study is limited to two-dimensional and lowRe, the applicability of the lattice Boltzmann method to vortex-induced motion was confirmed.