Effect of Perforated Baffle Shapes on Sloshing Reduction in Prismatic Tanks Using SPH Analysis

Sloshing is a phenomenon that is nonlinear in a liquid carrier, such as LNG or a tanker ship. One type of LNG carrier is the membrane-type carrier. The membrane type is similar to a prismatic tank, whose shape is suitable for a ship. This paper investigates the mitigation of sloshing in a prismatic tank by implementing a perforated baffle. There are four models of perforated baffle circles, rectangular, long ellipsoid, and short ellipsoid. The baffle position is at the midpoint of the tank, with a longitudinal position to suppress fluid in rolling motion. The filling ratios of the tank are 25% and 50%, mimicking experimental conditions with the excitation force rolling. The pressure sensor located near the free surface in 25% filling ratio was used to validate and verify the numerical approach of smoothed particle hydrodynamics (SPH). SPH is one of the numerical approaches for computational fluid dynamics (CFD) based on the particle method, which is suitable for large deformations and nonlinear free surface flows, such as sloshing. The dynamic pressure and free surface deformation after installation of the perforated baffle significantly decreased and proved the perforated baffle design suitable for the prismatic tank.