A Study of The Shallow Water Effect on The Ship Resistance and Squat (Case Study :TUKS Tuban)

Abstract

The large tides have a significant effect on the safety of the ship. Ships sailing in shallow waters due to large tides can cause increased resistance values and allow ships to squat. At TUKS Tuban, the depth of seawater from the seabed to the surface is about 8 m which must be passed by a ship with a draft of 6.7 m, so an analysis is needed to compare the resistance value of the ship when sailing in deep water with shallow water using Computational Fluid Dynamics (CFD) simulation and to find out how much the ship's bottom drops due to squat. Resistance analysis has been done on a Platform Supply Vessel (PSV) with a displacement of 6892 tons using CFD simulation based on Reynolds-Averaged Navier-Stokes Equation (RANSE). This study focused on three depth variations, 32 m, 16 m, and 8 m, each depth simulated at six speed variations, 8 knots, 10 knots, 12 knots, 14 knots, 16 knots, and 18 knots. Squat analysis has been done based on the CFD simulation results. The simulation results using CFD method show that the ship sailing at 8 m depth produces greater resistance compared to the ship sailing at 16 m depth at all speed variations. Based on the CFD simulation results, the pressure value at the bottom of the ship that operated at a depth of 8 m at speeds of 14 knots, 16 knots and 18 knots has decreased, thus at this speed when the ship sails in waters with a depth of 8 m, it has the possibility to experience grounding due to squat.