Analysis of the sloshing flows of a LNG cargo tank

The sloshing flows in a LNG cargo tank model (1/50 scale) of a ship are measured by an embedded panoramicPIV system. The measurement system consists of a Nd-Yag laser(120mJ, 15Hz), two cameras(1k x 1k) and a host computer. Four experimental cases were tested for the tank model, in which swaying motions are made by a 6 DOF-motion platform. The amplitudes of swaying are 9.76mm and 29.29mm, and the swaying frequencies are 0.633Hz and 0.828Hz. The measurement regions are the vertical plane 50mm away from the front wall of the tank where a pump tower is installed. It was verified that the flow patterns of the sloshing are similar to each other when the swaying amplitudes are similar.