Coupled Hydrodynamics and FEM Simulation of Catamaran Pontoon

Shallow water infrastructure needs to support increased activity on the shores of Semarang. This study chooses several pontoons because of their good stability, rolling motion, and more expansive space. A coupled simulation method consisting of hydrodynamic and structural calculations has been used to evaluate a catamaran pontoon’s motion and structural integrity. Four different space sizes are set for the pontoon system: 5 m, 5.5 m, 6 m, and 6.5 m. The frequency domain shows that the pontoon space affects the RAO in wave periods ranging from 3 s to 5 s. At wave periods of 3 s, 4 s, and 5 s, the pontoon space significantly affects the maximum motion and chain tension parameter values, which are evaluated via time domain simulation. The critical stress of the pontoon is shown at a wave period of 5 s for 5 m and 5.5 m of pontoon space, which shows that the stress can reach 248 MPa.