Abstract
A tapered bath agitated by bottom gas injection showed two types of swirl motions; shallow-water wave type and deep-water wave type. The occurrence conditions of the swirl motions were experimentally determined. Empirical equations were proposed for the period and amplitude of the swirl motions of the deep-water wave type. The numerical results for the period and amplitude were in good agreement with the values calculated from the empirical equations even for much larger scale vessels than that used for experiments. This fact suggests that the empirical equations are applicable to real scale baths.
