Investigation on forces exerted on a sediment particle in current and wave boundary layer through 3D lattice Boltzmann simulation
The 3-D lattice Boltzmann method is applied to evaluate the forces exerted on a stationary spherical particle in current and wave boundary layer flow in order to analyze the forces contributing to the incipient motion of the sediment particle. Results indicate that for current, the forces reach statistically steady finally at a relative low particle Reynolds number (less than 40). The streamwise drag force is the main driven force while the effect of the spanwise force can be ignored. The reason that results in the phenomenon is also discussed. As for the wave, the cyclical nature of the flow makes the evolution of drag and lift forces become quasiperiodic. The streamwise drag force is still the main driven force, but it changes direction with the flow.Meanwhile, the spanwise vorticity and the pressure around the particle show asymmetric distribution. The influence of spanwise force on the particle can not be neglected.
lattice Boltzmann method drag force lift force a stationary spherical particle smooth turbulent openchannel flow oscillatory boundary layer flow
Qing-he Zhang Lei Ding
School of Civil Engineering,Tianjin University&Key Laboratory of Harbor and Ocean Engineering(Tianjin University),Ministry of Education,Tianjin ,China
国际会议
9th International Conference on Hydrodynamics(第九届国际水动力学会议 ICHD2010)
上海
英文
266-271
2010-10-11（万方平台首次上网日期，不代表论文的发表时间）