抄録
Numerical study was performed for flows driven by oscillating bottom wall in two-dimensional square cavity. The unsteady flows are studied for representative values of Reynolds number Re and Froude number Fr with the frequency parameter varied in the range of 0.1 ⪇ ω' (= ωL/U) ⪇ 10.0. It is observed that for high frequency values, i. e. √<(2ν/ω)> / H << 1, the lid-oscillation does not penetrate much into the cavity and top surface naintains flat linear shape. For moderate to low frequency values, i.e. √<(2ν/ω)> / H ⪈ 1, depending on the values of Fr, free-surface motion is stimulated at a particular values of ω'= O (Fr^<-1>).
