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2 TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

2 2024

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Numerical prrediction of pneumatic Life raft performance

Jachowski J., Książkiewicz E.

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

2024

Vol. 18 No. 1

229--232

The success of the Search and Rescue (SAR) operation depends on the correct assignation of the search area for the drifting pneumatic life raft, with particular emphasis on leeway. The leeway is directly dependent on the hydrodynamic drag and wind pressure force acting on above-water and underwater parts of the life raft. The paper presents the numerical study on the pneumatic life raft performance including hydrodynamic and aerodynamic characteristics in a wide range of operational conditions. The numerical simulation results were compared with model test results obtained in towing tank and wind tunnel. The proper prediction of life raft performance is important for determination of life raft safety function dependent on wind velocity and operational characteristics. The results of numerical simulation are in line with data available in literature and obtained from empirical investigations.

Length of navigation season in current conditions of climate change on the Northern Sea Route

Pastusiak Tadeusz

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

2024

Vol. 18 No. 3

493--502

The paper first analyzed ice maps for the years 2008-2022. Despite the general convergence of trends of opening and closing of navigable season for concentrations 18% and 81% the Eastern Part and Western Part of the NSR looks they are under different driving factors. Found some tendencies and cyclical changes, but not working for the whole studied period. The studied period of 15 navigation seasons from statistical point of view is too short period of time to forecast trends and cycles in the near future. Next, ships traffic and ice conditions being on the NSR for the years 2012, 2013, 2015, 2017, 2018, 2020 and 2021 were examined. The navigable time windows of Arc4, arc5 and Arc7 class ships were determined. Found, the not navigable period of time for any class of merchant ships lasted 3 months.