... ABSTRACT Maneuverability prediction is crucial for the design and operation of high-speed crafts. To evaluate whether the designed 25-meter twin-propeller twin-rudder high-speed workboat meets the requirements of maneuverability specifications, a 3-degree of freedom (DOF) maneuvering motion...

... ABSTRACT In this study, OpenFOAM is utilized to model the flow around a propeller operating in water-air-bubble mixed conditions. Such complex multiphase flow can be encountered in sailing ships. The accumulation of a substantial quantity of bubbles around the propulsion system diminishes...

... ABSTRACT A toroidal propeller is an advanced propulsive system, which is composed of toroidal closed blades and a hub. The open-water performance of the toroidal propeller is numerically simulated in order to examine the influence of the front and aft blades on the tip vortex and wake field...

... of the radial distance between the gate rudder and the propeller is also analyzed, indicating that the open-water efficiency can be improved about 4% when the distance is 1.15 R . The gate rudder system in maneuvering is finally simulated. It shows that the gate rudder can produce more transverse force...

... contain at least two types of energy. Compared with conventional single-screw propulsion (one engine, one propeller), the operating model of HPSs has higher flexibility under complex navigation conditions. By selecting appropriate operating modes, the efficiency of the HPSs can be improved. However, how...

... and losses can make a significant difference to the thrust allocation hence also station keeping. interaction engineering algorithm propeller thrust simulation azimuth thruster dp operation identification mathematics of computing revolution dynamic positioning operation thruster interaction...

... for subsequent parametric research. INTRODUCTION The azimuth thruster combines the propulsion performance of traditional propeller and the operation performance of rudder, and can rotate 360 degrees around its vertical axis, which greatly enhances the flexibility of ship maneuvering. This makes...

... Vortex Element model used for the analysis of propeller(s) operating in the wake field of the ship, in conjunction with seakeeping analysis in regular and irregular waves. INTRODUCTION Requirements and inter-governmental regulations for greening the waterborne transport have recently become very...

...) is required than the traditional design method based on experience in analyzing only the nominal wake field. mathematics of computing simulation sustainable development sustainability propeller social responsibility stator boundary propeller plane wave-making resistance esd numerical...

... ABSTRACT CFD simulations of full-scale self-propulsion are carried out for a bulk carrier ship. A series of speeds around the target speed is selected as a simulation working condition. Utilizing the body-force propeller model, the governing equations are solved with the URANS method...

... ABSTRACT This paper presents a control method for adjusting propeller rotation speed to reduce cavitation observed on the propeller suction side, attributed to a decrease in flow velocity in the wake field. The primary goal is to decrease the cavity volume while concurrently preventing...

.... Novel propulsion concepts enable achieving higher propulsive efficiencies to reduce fuel consumption and emissions. In this paper we present a hydrodynamic and cavitation study of a high efficiency trochoidal propeller by means of computational fluid dynamics (CFD) methods. This type of propeller...

... ABSTRACT The effects of Reynolds number on open-water and self-propulsion performance of a propeller with short chord length are investigated by numerical and experimental methods in the present work. Numerical studies are carried out using the RANS solver together with the γ - Re θ model...

... ABSTRACT In the present study, RANS method and K-omega turbulence model are used to simulate the force characteristics of rudder under different drift angles and propeller faults. K-omega turbulence model includes two extra transport equations to represent the turbulent properties of the flow...

... with the results of the model test, the cavitation pattern is generally in accordance with the test results, and the blade back sheet cavity, blade face cavity, tip vortex cavity and gap vortex cavity are captured very well. Because of the close distance between the stud and the duct propeller, the phenomenon...

... environment and they will be subject to external loads such as wind, wave and current, which require the vent mast to have sufficient strength to ensure the support of the ventilation cap. Apart of this, the ship's main engine and propeller generate some periodic incentives and the deck will transmit...

... ABSTRACT Current propeller monitoring methods are mostly based on dedicated processes e.g. dry-docking inspections or using additional onboard equipment. Potentially, seismic sensors can be deployed to analyze passing ships to draw conclusions about the propeller condition. The advantage...

... typical optimization schemes. The study results indicate that the RDT propeller s unique blade structure eliminates the blade tip leakage vortex and reduces noise. The optimization study shows that ID 68 and ID 375 can reduce the sum of SPL at receiver points 1-7 by about 8 dB and 6 dB, respectively...

... ABSTRACT The acoustic pattern of the twin propellers shows that different phases between their rotation enhance or diminish the noise generated by the propellers. Therefore, a possible solution for reducing noise emissions by marine propellers, which constitute a major environmental hazard...

..., Hubei, China 3.Marine Design and Research Institute of China,Shanghai,China. ABSTRACT The propulsion of the small biomimetic ROV relies primarily on propellers. This project aims to optimize the performance of a ducted propeller by utilizing the StarCCM+ software for computational fluid dynamics...