TopTier model tests and simulations on parametric roll behaviour of two large container vessels

Running from end of 2021 to early 2025, the TopTier Joint Industry Project, with 40 participants, focused on enhancing cargo securing safety on container ships. Many aspects were covered in the project, ranging from container and lashing strength, stowage, stack dynamics, operational guidance to rules and regulations.

This paper focuses on parametric rolling ship motion. It is of key importance to know in which wave conditions large roll might occur. For this reason, seakeeping model tests were performed for two large container vessels with a capacity of 10,000 and 15,000 containers. 190 tests in regular waves and 42 tests in irregular seas (most of them with 3-h duration) were performed, most of which were performed in stern and bow quartering seas. Both synchronous and parametric roll were studied in wave conditions around the boundary of in- and off-design motions. Together with several other participants, calculations were done to compare and validate tools and their ability to predict the wave conditions in which off-design roll motions are likely to occur. The tools are detailed and compared against each other as well as the experimental results, revealing both capabilities and challenges in the assessment of parametric rolling.

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