操縦運動時の船体まわりの流場に関する研究

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An accurate method of estimating ship manoeuvrability needs to be developed to accurately evaluate and improve the manoeuvrability of ships. In order to estimate manoeuvrability by a mathematical model, the hydrodynamic forces acting on a ship in manoeuvring motion need to be estimated, for which information on the flow field around a ship is needed. In this research, we investigated the flow field around a ship and developed a method of estimating the hydrodynamic forces. We measured the flow field at the ship stern in detail, since this information is particularly important for manoeuvrability. We collected data on the characteristics of the flow field around a ship and developed a method to estimate hydrodynamic forces acting on a ship in manoeuvring motion. We studied two methods of estimating hydrodynamic forces. One is a simple, practical method that can be used at the initial designe stage. We proposed an approximation method based on the slender body theory. The other is a precise method called CFD (Computational Fluid Dynamics) that can estimate flow field and hydrodynamic forces in detail. The CFD method is increasingly used in the study of ship resistance and propulsion. We used the CFD method to study oblique towing motion, and confirmed that the method can be used to estimate hydrodynamic forces acting on a ship in manoeuvring motion. In addition to the above researches, we conducted free-running model tests of dry cargo ships to study the effect of loading conditions on manoeuvrability, and found that a change in draft affects the course stability. The results of these studies will facilitate future research of ship manoeuvrability.
独立行政法人海上技術安全研究所の論文
1997-09-10

操縦運動時の船体まわりの流場に関する研究

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