Dynamic Pressure Caused by Swashing Fluid in Tanks of Ore-Bulk-Oil Carrier

Abstract

This report presonts the experimental investigation of the dynamic pressure exerted on tank walls of ore-bulk-oil carrier by swashing internal fluid. A tank model of one fiftieth of 88,000 t O/B/O carrier was used as a basic one and for the sake of comparison one rectangular model and two O/B/O tank models with B/D ratio different from that of basic model was used. Tests were carried out by putting the model tanks on a specially designed rolling apparatus. The influencing factors, depth of fluid, tank breadth, amplitude and period of periodical motion of the tank and so on, were varied systematically. At the same time, the effectiveness of bottom-centerline swash girder abating swashing pressure was examined. The distribution of dynamical pressure on the tank side wall was measured together with the motion of tank. The experimental results were expressed with regard to the tank motion. From this experiment, we derived the experimental formula for the pressure acting on the side wall of tank and proved that bottom centerline swash girder was useful for the reduction of dynamic pressure.