Study of Two Ships Approaching Process and Towing Motion under Wave Action

The rescue of ships in distress at sea relies mainly on vessels, which includes the approaching process and towing motion two ships. Ship can be reduced to a two-ship problem, primarily involving relative between during rescue. We established mathematical model ship based viscous fluid N-S equation, Wigley under waves was simulated two-dimensional plane. Then, according three-dimensional potential flow theory, coupled response six degrees freedom constructed, calculation models wind, waves, currents other environmental disturbance factors were numerically calculate motion. results show that upstream vessel has lower heave amplitude higher roll process; A ratio 1.5 times width is critical area where interacts with each other; For berthing process, faster active is, will for both downstream vessels. When rough conditions, changes wave height velocity have large influence coupling effect system. towing, head-on low conditions are preferred, should sufficiently high reduce cable self-weight towed ship. According simulations, recommended range 3–5 m/s. Finally, scaling developed similar quasi-Froude number test, simulation verified by conducting parallel tests basin spherical wave-maker device.