Numerical analysis of vortex-induced motion of two-dimensional circular cylinder by lattice Boltzmann method

作者：Hirabayashi Shinichiro^*

来源：Journal of Marine Science and Technology (Japan), 2016, 21(3): 426-433.

DOI：10.1007/s00773-015-0365-7

• Vortex-induced motion
• Lattice Boltzmann method
• Moving boundary
• Resonance
• Mooring

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 at Re = 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 low Re, the applicability of the lattice Boltzmann method to vortex-induced motion was confirmed.

• 出版日期2016-9