Suppression of fluid force on flow past a square cylinder with a detached flat plate at low Reynolds number for various spacing ratios

摘要

A numerical study for flow past a square cylinder in a two-dimensional channel with a detached flat plate is investigated in this paper. A flat plate is detached downstream in order to control the flow around and behind the square cylinder. Fluid forces acting on the square cylinder, wake structure mechanism and vortex shedding frequency are presented systematically for different Reynolds numbers and spacing ratios. Effects of Reynolds numbers upon physical parameters are also studied. Variation of Reynolds number is from 75 to 200, based on the incoming flow velocity and width of cylinder. The lattice Boltzmann method is used for this numerical investigation. In this study, we choose three different spacing ratios namely closely, moderately and widely. Numerical studies show that some physical parameters significantly reduced by the detached flat plate for closely spacing ratio. The results which we obtained in this investigation are authentic in the sense that some other experimental observations by different authors can be deduced from our results.