Vol 20, No 1 (2016) > Marine Engineering >

Maneuverability of Ships with small Draught in Steady Wind

Daeng Paroka 1 , Andi Haris Muhammad 2 , Syamsul Asri 2

Affiliations:

  1. Department of Naval Architect Hasanuddin University
  2. Department of Naval Architects, Faculty of Engineering, Hasanuddin University, Makassar, Indonesia 990245)

 

Abstract: Wind force and moment may force a ship to drastically decrease its speed and use a large drift angle as well as a large rudder angle in order to maintain its course. Shipswith a small draught might have more risk in maneuvering to its point of view compared with a ship with a larger draught. This paper discusses maneuverability of a ship with a small draught in steady wind. The effect of wind on ship speed, drift angle, and rudder angle are investigated in a steady state condition. Five different ratios of wind velocity to ship speed from 1.0 to 20.0 are used in the simulation. The variation in wind direction is examined from 0°to 180°. Results of the numerical simulation show that thewind has a significant effect on the reduction in ship speed with a wind direction less than 100°. The drift angle increases due to increasing wind velocity in the same wind direction. Wind direction also has a significant effect on the drift angle especially when the wind direction is less than 140°. The same phenomenon was found for the rudder angle. The necessary rudder angle is greater than the maximum rudder angle of the ship when the wind direction is 60°with a wind velocity to ship speed ratio of 20 or more.
Keywords: drift angle, maneuverability, rudder angle, ship speed, wind
Published at: Vol 20, No 1 (2016) pages: 24-30
DOI:

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