Abstract
Flow around a rectangular cylinder in oscillatory flow was studied by a numerical simulation using a finite-volume method. The computations were carried out through Keulegan-Carpenter number(KC) in the range of 3≦KC≦ 12 at Stokes number (β)=95 in the case of D/H=0.6,2.0. At KC=3 and 4,longitudinal vortices arrange periodically along the axis of the cylinder were predicted in both cases of D/H=0.6 and 2.0 such as in the case of circular and square cylinder. For D/H=0.6,at KC=12,"transverse-vortex street" obtained in circular cylinder was also predicted. The characteristics of fluid-dynamic forces were in good agreement with experimental results.
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