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Numerical study on interference effects and wetted area pattern of asymmetric planing catamarans

Yengejeh, Mortaza Azizi and Amiri, Mojtaba Maali and Mehdigholi, Hamid and Seif, Mohammad Saeed and Yaakob, Omar (2016) Numerical study on interference effects and wetted area pattern of asymmetric planing catamarans. Proceedings Of The Institution Of Mechanical Engineers Part M-Journal Of Engineering For The Maritime Environment, 230 (2). pp. 417-433. ISSN 1475-0902

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Official URL: http://dx.doi.org/10.1177/1475090215586638


Asymmetrical planing catamarans are increasingly used in moderate to very high-speed applications due to some tempting qualities such as less wetted surface and better seakeeping behavior. The present numerical study attempts to provide new insight into hydrodynamics of such vessels by highlighting the distinguishing aspects and employing novel appropriate approaches to deal with them. A systematic investigation has been carried out on a prismatic geometry at various demihull separations (including zero separation, that is, symmetric monohull) and different trim angles in a wide range of speed coefficients, using a computational fluid dynamics solver. Obtained numerical results of steady-state resistance and lift forces are compared against different empirical methods. In order to offer an adequate explanation about the nature of forces and interference mechanisms, an analysis has been performed on viscous and pressure resistance components. Furthermore, the ability of the employed numerical method in estimation of wetted area pattern at the bottom of the planing hulls has been evaluated to provide explanation for some observed hydrodynamic behaviors of the asymmetric planing catamarans. It is seen that a significant reduction is reached in wetted surface area of catamaran configuration in comparison with corresponding monohull.

Item Type:Article
Uncontrolled Keywords:interference, Savitsky's method, wetted surface
Subjects:G Geography. Anthropology. Recreation > GV Recreation Leisure
Divisions:Mechanical Engineering
ID Code:70084
Deposited By: Narimah Nawil
Deposited On:22 Nov 2017 00:45
Last Modified:22 Nov 2017 00:45

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