Journal of Ocean Engineering and Technology (한국해양공학회지)

Korean Society of Ocean Engineers (한국해양공학회)
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Change in Turning Ability According to the Side Fin Angle of a Ship Based on a Mathematical Model

  • Lee, WangGook (Department of Naval Architecture & Ocean Engineering, Inha University) ;
  • Kim, Sang-Hyun (Department of Naval Architecture & Ocean Engineering, Inha University) ;
  • Jung, DooJin (Department of Naval Architecture & Ocean Engineering, Inha University) ;
  • Kwon, Sooyeon (Department of Naval Architecture & Ocean Engineering, Inha University)
  • Received : 2021.12.27
  • Accepted : 2022.02.27
  • Published : 2022.04.30
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Abstract

In general, the effect of roll motion is not considered in the study on maneuverability in calm water. However, for high-speed twin-screw ships such as the DTMB 5415, the coupling effects of roll and other motions should be considered. Therefore, in this study, the estimation of maneuverability using a 4-degree-of-freedom (DOF; surge, sway, roll, yaw) maneuvering mathematical group (MMG) model was conducted for the DTMB 5415, to improve the estimation accuracy of its maneuverability. Furthermore, a study on the change in turning performance according to the fin angle was conducted. To accurately calculate the lift and drag forces generated by the fins, it is necessary to consider the three-dimensional shape of the wing, submerged depth, and effect of interference with the hull. First, a maneuvering simulation model was developed based on the 4-DOF MMG mathematical model, and the lift force and moment generated by the side fins were considered as external force terms. By employing the CFD model, the lift and drag forces generated from the side fins during ship operation were calculated, and the results were adopted as the external force terms of the 4-DOF MMG mathematical model. A 35° turning simulation was conducted by altering the ship's speed and the angle of the side fins. Accordingly, it was confirmed that the MMG simulation model constructed with the lift force of the fins calculated through CFD can sufficiently estimate maneuverability. It was confirmed that the heel angle changes according to the fin angle during steady turning, and the turning performance changes accordingly. In addition, it was verified that the turning performance could be improved by increasing the heel angle in the outward turning direction using the side fin, and that the sway speed of the ship during turning can affect the turning performance. Hence, it is considered necessary to study the effect of the sway speed on the turning performance of a ship during turning.

Keywords

Acknowledgement

This study is the result of research conducted with the support of the Korea Institute for Advancement of Technology (KIAT) with the funding of the Ministry of Trade, Industry and Energy's "Industrial Professionals Competency Reinforcement Project" Basic research project (No. 2020R1F1A1071610) supported by the National Research Foundation with funding from the Ministry of Communications) and CO2 (DFOC) reduction based on the real operation of medium-sized ships conducted with the funding of the Ministry of Trade, the Industry and Energy's "Medium Shipyard Innovation Growth Development Project" with the support of Technology Development (Project No.: 20007847), and research project of Inha University (Project No.: 62968).

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