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Examining the importance of hydrodynamic interaction

AuthorsJohan Dekker
Conference/JournalMARIN Report 132
DateSep 30, 2021
When a ship enters a lock or passes under a narrow bridge, the hydrodynamic effect is obvious, but hydrodynamic
interaction also plays a role in canals, fairways and port areas. The increase in ship sizes stretches the safe use of
existing infrastructure.

When large vessels and a restricted fairway are combined with a fast sailing speed, for instance due to high winds,
this can lead to dangerous situations. An official report into the grounding of the Ever Given in the Suez Canal hasn’t
been published yet, but experts suggest that hydrodynamic interaction effects between the ship and canal banks have played a major role.

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Yangtzekanaal study

Hydrodynamic interaction is also an important factor for sailing vessels in encounter and overtaking manoeuvres in confined waters. Ship-ship interaction has been included in a real-time simulation
study for the approach to Eemshaven/ Emden where fast-sailing car carriers were overtaking slower sailing ships. More recently, encounter manoeuvres in the Yangtzekanaal in the port of Rotterdam were studied. This 570 m wide port basin is used for two-way traffic by ULCSs. Using real-time simulations, the possibilities and restrictions for such encounter manoeuvres in strong winds were investigated.

Wind loads on large container ships ar studied within the Windlass JIP