Changes in the Hydrodynamic Characteristics of Ships During Port Maneuvers
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초록
To reach a port, a ship must pass through a shallow water zone where seabed effects alter the hydrodynamics acting on the ship. This study examined the maneuvering characteristics of an autonomous surface ship at 3-DOF (Degree of freedom) motion in deep water and shallow water based on the in-port speed of 1.54 m/s. The CFD (Computational fluid dynamics) method was used as a specialized tool in naval hydrodynamics based on the RANS (Reynolds-averaged Navier-Stoke) solver for maneuvering prediction. A virtual captive model test in CFD with various constrained motions, such as static drift, circular motion, and combined circular motion with drift, was performed to determine the hydrodynamic forces and moments of the ship. In addition, a model test was performed in a square tank for a static drift test in deep water to verify the accuracy of the CFD method by comparing the hydrodynamic forces and moments. The results showed changes in hydrodynamic forces and moments in deep and shallow water, with the latter increasing dramatically in very shallow water. The velocity fields demonstrated an increasing change in velocity as water became shallower. The least-squares method was applied to obtain the hydrodynamic coefficients by distinguishing a linear and non-linear model of the hydrodynamic force models. The course stability, maneuverability, and collision avoidance ability were evaluated from the estimated hydrodynamic coefficients. The hydrodynamic characteristics showed that the course stability improved in extremely shallow water. The maneuverability was satisfied with IMO (2002) except for extremely shallow water, and collision avoidance ability was a good performance in deep and shallow water.
Abstract
To reach a port, a ship must pass through a shallow water zone where seabed effects alter the hydrodynamics acting on the ship. This study examined the maneuvering characteristics of an autonomous surface ship at 3-DOF (Degree of freedom) motion in deep water and shallow water based on the in-port speed of 1.54 m/s. The CFD (Computational fluid dynamics) method was used as a specialized tool in naval hydrodynamics based on the RANS (Reynolds-averaged Navier-Stoke) solver for maneuvering prediction. A virtual captive model test in CFD with various constrained motions, such as static drift, circular motion, and combined circular motion with drift, was performed to determine the hydrodynamic forces and moments of the ship. In addition, a model test was performed in a square tank for a static drift test in deep water to verify the accuracy of the CFD method by comparing the hydrodynamic forces and moments. The results showed changes in hydrodynamic forces and moments in deep and shallow water, with the latter increasing dramatically in very shallow water. The velocity fields demonstrated an increasing change in velocity as water became shallower. The least-squares method was applied to obtain the hydrodynamic coefficients by distinguishing a linear and non-linear model of the hydrodynamic force models. The course stability, maneuverability, and collision avoidance ability were evaluated from the estimated hydrodynamic coefficients. The hydrodynamic characteristics showed that the course stability improved in extremely shallow water. The maneuverability was satisfied with IMO (2002) except for extremely shallow water, and collision avoidance ability was a good performance in deep and shallow water.
참고문헌 (20)
- Carrica, P. M, "Direct Simulation and Experimental Study of Zigzag Maneuver of KCS in Shallow Water", Ocean Engineering, 112, pp.117~133 (2016)[DOI]
- Delefortrie, G, "Captive Model Tests Based 6 DOF Shallow Water Manoeuvring Model", Proceedings of the 4th International Conference on Ship Manoeuvring in Shallow and Confined Water (MASHCON), pp.273~286 (2016)
- Di Mascio, A, "Investigation of Twin-Screw Naval Ships Maneuverability Behavior", Journal of Ship Research, 55(4), pp.221~248 (2011)[DOI]
- Duarte, H. O, "Review of Practical Aspects of Shallow Water and Bank Effects", Transactions of the Royal Institution of Naval Architects Part A: International Journal of Maritime Engineering, 158, pp.177~186 (2016)[DOI]
- Fuji, J, "Traffic Capacity", The Journal of Navigation, 24, pp.543~552 (1971)
- ITTC, "ITTC – Recommended Procedures and Guidelines", pp.11~18 (2011)
- Jachowski, J, "Assessment of Ship Squat in Shallow Water Using CFD", Archives of Civil and Mechanical Engineering, 8(1), pp.27~36 (2008)[DOI]
- Khanfir, S, "Manoeuvring Characteristics of Twin-Rudder Systems:Rudder-Hull Interaction Effect on the Manoeuvrability of Twin-Rudder Ships", Journal of Marine Science and Technology, 16(4), pp.472~490 (2011)[DOI]
- Kim, Y. G, "Prediction of the Maneuverability of a Large Container Ship with Twin Propellers and Twin Rudders", Journal of Marine Science and Technology, 12(3), pp.130~138 (2007)[DOI]
- Kim, D. J, "Mathematical Model for Harbour Manoeuvres of Korea Autonomous Surface Ship(KASS)Based on Captive Model Tests", Proceedings of Conference of Korean Association of Ocean Science and Technology Societies (2021)
- 이상민, "Reduction of UKC for Very Large Tanker and Container Ship in Shallow Water", 해양환경안전학회지, 27(3), pp.409~420 (2021), 해양환경안전학회[DOI]
- Sangmin Lee, "Study on the course stability of very large vessels in shallow water using CFD", Ocean Engineering, 145, pp.395~405 (2017), Elsevier BV[DOI]
- Lee, M. C, "A Collision Avoidance Method for Multi-Ship Encounter Situations", Journal of Marine Science and Technology(Japan), 25(3), pp.925~942 (2020)[DOI]
- Thi Loan Mai, "Analysis on Hydrodynamic Force Acting on a Catamaran at Low Speed Using RANS Numerical Method", 한국항해항만학회지, 44(2), pp.53~64 (2020), 한국항해항만학회
- Quérard, A, "Influence of Viscous Effects on the Hydrodynamics of Ship-Like Section Undergoing Symmetric and Anti-Symmetric Motions Using RANS", Proceedings of the 27th International Conference on Offshore Mechanics and Arctic Engineering, pp.683~692 (2008)
- Shaobo, W, "A Collision Avoidance Decision-Making System for Autonomous Ship Based on Modified Velocity Obstacle Method", Ocean Engineering, 215, pp.107910~ (2020)[DOI]
- Taimuri, G, "A 6-DOF Maneuvering Model for the Rapid Estimation of Hydrodynamic Actions in Deep and Shallow Waters", Ocean Engineering, 218, pp.108103~ (2020)[DOI]
- Yasukawa, H, "Introduction of MMG Standard Method for Ship Maneuvering Predictions", Journal of Marine Science and Technology(Japan), 20(1), pp.37~52 (2015)[DOI]
- 윤근항, "KVLCC2 선형의 천수영역에서의 자세 변화에 대한연구", 대한조선학회 논문집, 51(6), pp.539~547 (2014), 대한조선학회
- 임정빈, "자율운항선박의 선회특성이 충돌회피에 미치는 영향", 한국항해항만학회지, 45(6), pp.298~305 (2021), 한국항해항만학회