Abstract
The flow around a rectangular cylinder which moves over a plate has been simulated by the LES method at Reynolds number of 7,000. The Smagorinsky model was used as a subgrid scale (SGS) model. The time averaged and fluctuating fluid forces were calculated by changing the gap-to-height ratio S/H and the width-to-height ratio B/H of a cross section of the rectangular cylinder, as parameters. The lift force variations from the numerical analysis are in good agreement with those of the experimental data from the towing water tank tests. For S/H ≦ 0.5, the drag forces are not dependent on the width-to-height ratio B/H. It is found that the lift force variations to the gap-to-height ratio S/H relate with the flow pattern of three dimensional vortex structures.
