Numerical analysis of escort tug manoeuvrability characteristics

Piaggio, Benedetto; Villa, Diego; Viviani, Michele

doi:10.1016/j.apor.2020.102075

Cited by 19 publications

(8 citation statements)

References 5 publications

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“…StarCCM+ is a general-purpose finite volume code widely used to solve naval problems. In the last several decades, it has been successfully applied to address several naval problems, ranging from simple cases such as the prediction of the hull resistance [24,25] or the numerical evaluation of the propeller performance [26], to complex interaction problems like rudder-propeller [27], self-propulsion estimations [28,29], or the prediction of ship maneuver characteristics [30]. Regarding applications directly related to the prediction of propeller performance, this code has demonstrated its accuracy in different conditions: with a spatial homogeneous wake [31] (i.e., in open water conditions), with inclined shaft [32], and in behind hull conditions, including cavitation [33].…”

Section: Numerical Methodologymentioning

confidence: 99%

Numerical and Experimental Comparison of Ducted and Non-Ducted Propellers

Villa

Gaggero

Tani

et al. 2020

JMSE

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Ducted propellers are unconventional systems that are usually adopted for ship propulsion. These devices have recently been studied with medium-fidelity computational fluid dynamics code (based on the potential flow hypothesis) with promising results. However, these tools, even though they provide a good prediction of the forces and moments generated by the blades and the duct, are not able to provide insight into the flow field characteristics due to their crude flow approximations. On the contrary, modern high-fidelity viscous-based computational fluid dynamics codes could give a better description of the near and far-field flow of these particular devices. In the present paper, forces and the most significant features of the flow field around two ducted propellers are analyzed by means of both experimental and computational fluid dynamics approaches. In particular, accelerating and decelerating ducts are considered, and we demonstrate the ability of the adopted solver to accurately predict the performance and the flow field for both types. These results, in particular for the less-studied decelerating duct, designate CFD as a useful tool for reliable designs.

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Section: Numerical Methodologymentioning

confidence: 99%

Numerical and Experimental Comparison of Ducted and Non-Ducted Propellers

Villa

Gaggero

Tani

et al. 2020

JMSE

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“…In the present paper, the open-source CFD library OpenFOAM has been considered as flow solver. This code has been demonstrated to be able to tackle marine problems with high quality results (see for instance [29][30][31]). It is designed to solve the flow field characteristics by adopting a general polyhedral mesh with a finite volume approach.…”

Section: Numerical Backgroundmentioning

confidence: 99%

Numerical Analysis of the Rudder–Propeller Interaction

Villa

Franceschi

Viviani

2020

JMSE

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The proper evaluation of the Rudder–Propeller interactions is mandatory to correctly predict the manoeuvring capability of a modern ship, in particular considering the commonly adopted ship layout (rudder often works in the propeller slipstream). Modern Computational Fluid Dynamics (CFD) solvers can provide, not only the performance of the whole system but also an insight into the flow problem. In the present paper, an open-source viscous flow solver has been validated against available literature experimental measurements in different conditions. After an extensive analysis of the numerical influence of the mesh arrangement and the turbulent quantities on the rudder provided forces, the study focused its attention on the forces generated by the rudder varying the propeller loading conditions and the mutual position between the two devices. These analyses give a hint to describe and improve a commonly-used semi-empirical method based on the actuator disk theory. These analyses also demonstrate the ability of these numerical approaches to correctly predict the interaction behaviour in pre-stall conditions with quite reasonable computational requests (proper also for a design stage), giving additional information on the sectional forces distribution along the span-wise rudder direction, useful to further develop a new semi-empirical rudder model.

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“…Tugboat maneuvering dynamics have been tackled using numerical and experimental methods with an eye on the hydrodynamic forces that act on the tugboat hull and appendages, the tug motions, and trajectories at different speeds [8]. Well validated RANS CFD methods could enable the broad derivation of improved hydrodynamic derivatives for use by modular maneuvering models [9].…”

Section: Introductionmentioning

confidence: 99%

Numerical studies on tugboat performance during pushing operations

Abdelghafor,

Taimuri,

Kujala

et al. 2023

IOP Conf. Ser.: Mater. Sci. Eng.

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This paper introduces a RANS CFD methodology for the evaluation of tugboat dynamics during pushing operations. Two- and three- dimensional methods that respectively utilize “Dynamic Fluid Body Interactions - (DFBI)” and “Tug Force Equilibrium kinematics-(TFE)” are assessed and compared with the aim to better understand the influence of fluid modelling on ship dynamics. For the DFBI method, an unsteady RANS solver comprising of a dynamic fluid body interaction module and a contact mechanics coupling algorithm are used to predict the forces between a tugboat and an assisted ship. For the TFE method, a steady RANS method is applied and contact actions are calculated as a sum of the hydrodynamic forces on the hull and the propeller. Whereas DFBI accounts for the time variation of the contact forces, the TFE is more rapid and could be used to derive operational decision support criteria. To demonstrate the latter the TFE method is used to derive the pushing forces based on a set of 16 numerical simulations. It is concluded that irrespective of the model used the tugboat speed and orientation may amplify the pushing forces. This effect could be prominent, especially at slow speeds for which the sway force acts in opposite direction to the tug.

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Numerical analysis of escort tug manoeuvrability characteristics

Cited by 19 publications

References 5 publications

Numerical and Experimental Comparison of Ducted and Non-Ducted Propellers

Numerical and Experimental Comparison of Ducted and Non-Ducted Propellers

Numerical Analysis of the Rudder–Propeller Interaction

Numerical studies on tugboat performance during pushing operations

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