For a series of five containerships of differing capacities (707, 3400, 5300, 14000 and 18000 TEU) systematic computations were performed to estimate the tow force required in an emergency. Time-average ship positions with respect to the given waves, wind and current directions and the corresponding time-average forces were considered. Current speed was considered to include also towing speed. Directionally aligned as well as not aligned wind and waves were investigated. Wave height, wind speed, and wave and wind direction relative to current direction were systematically varied. Wind speeds based on the Beaufort wind force scale corresponded to significant wave heights for a fully arisen sea. Waves were assumed to be irregular short-crested seaways described by a JONSWAP spectrum with peak parameter 3.3 and cosine squared directional spreading. For each combination of current speed, wave direction, significant wave height and peak wave period, the required tow force and the associated drift angle were calculated. Tow force calculations were based on the solution of equilibrium equations in the horizontal plane. A RANS solver for current and wind forces and a Rankine source-patch method for drift forces in waves computed hydrodynamic forces and moments. Tow forces accounted for steady (calm-water) hydrodynamic forces and moments, constant wind forces and moments, and time-average wave drift forces and moments. Rudder and propeller forces and towline forces were neglected.
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ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering
June 8–13, 2014
San Francisco, California, USA
Conference Sponsors:
- Ocean, Offshore and Arctic Engineering Division
ISBN:
978-0-7918-4549-3
PROCEEDINGS PAPER
Tow Forces for Emergency Towing of Containerships
Vladimir Shigunov,
Vladimir Shigunov
DNV GL, Hamburg, Germany
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Thomas E. Schellin
Thomas E. Schellin
DNV GL, Hamburg, Germany
Search for other works by this author on:
Vladimir Shigunov
DNV GL, Hamburg, Germany
Thomas E. Schellin
DNV GL, Hamburg, Germany
Paper No:
OMAE2014-23918, V007T12A016; 10 pages
Published Online:
October 1, 2014
Citation
Shigunov, V, & Schellin, TE. "Tow Forces for Emergency Towing of Containerships." Proceedings of the ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering. Volume 7: Ocean Space Utilization; Professor Emeritus J. Randolph Paulling Honoring Symposium on Ocean Technology. San Francisco, California, USA. June 8–13, 2014. V007T12A016. ASME. https://doi.org/10.1115/OMAE2014-23918
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