Multi-fidelity optimization of a high-speed foil-assisted semi-planing catamaran for low wake

Kandasamy, Manivannan; Peri, Daniële; Ooi, Seng Keat; Carrica, Pablo M.; Stern, Frederick; Campana, Emilio F.; Osborne, Philip D.; Cote, Jessica; MacDonald, Neil J.; Waal, Nic de

doi:10.1007/s00773-011-0119-0

Cited by 21 publications

(9 citation statements)

References 10 publications

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“…Stern et al [12,13] have shown interference-induced longitudinal vortices for SWATH. Kandasamy et al [14] demonstrated the possibility of reduced wake signatures for foil-assisted catamarans. Milanov et al [15] discussed about the most relevant issues for the improvement of high-speed catamaran deep/shallow watercourse stability design and of system-based method predictions.…”

Section: Introductionmentioning

confidence: 98%

Numerical analysis of the interference effects on resistance, sinkage and trim of a fast catamaran

Castiglione

Kandasamy

et al. 2014

J Mar Sci Technol

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The purpose of the present paper is the numerical investigation of the interference phenomena between the waves generated by the individual hulls of a catamaran. The study focuses on the effects of both Froude number and demi-hull separation distance on resistance and on sinkage and trim. The numerical simulations are carried out by the URANS solver CFDShip-Iowa V.4 and, to assess the capability for prediction of resistance, sinkage and trim of the URANS code for twin-hull configuration vessels, a verification and validation study is performed for global as well as for local variables. A very good agreement between the numerical results and the experimental data is obtained, and the validation study demonstrates the high level of accuracy of the current predictions, which are used to have a better insight into the interference phenomena. In accordance with the experiments, within Fr = 0.45-0.65, the catamaran has a significantly higher resistance coefficient compared to the mono-hull; furthermore, the C T value increases with decreasing the separation distance between the twin hulls. On the contrary, at Fr lower than 0.45 and at Fr higher than 0.65, the effects of hull spacing on resistance as well as on sinkage and trim can be neglected. The flow field characteristics, wave pattern, wave cuts and pressure distributions are analyzed through the CFD analysis. Finally, the effects of the Reynolds number on resistance are also investigated and results show a small decrease in interference with increasing the Reynolds number.

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Section: Introductionmentioning

confidence: 98%

Numerical analysis of the interference effects on resistance, sinkage and trim of a fast catamaran

Castiglione

Kandasamy

et al. 2014

J Mar Sci Technol

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“…The literature offers several references to hydrofoils application for fast mono and multi hull crafts (Besnard, et al, 1998;Prastowo, et al, 2016;Kandasamy, et al, 2011). An historical review of their application on several types of fast crafts, together with an experimental report of the advantages in several sailing conditions, is reported in (Migeotte, 2002).…”

Section: Introductionmentioning

confidence: 99%

Combining Analytical Models and Mesh Morphing Based Optimization Techniques for the Design of Flying Multihulls Appendages

Cella

Groth

Porziani

et al. 2021

Journal of Sailing Technology

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The fluid dynamic design of hydrofoils involves most of the typical difficulties of aeronautical wings design with additional complexities related to the design of a device operating in a multiphase environment. For this reason, “high fidelity” analysis solvers should be, in general, adopted also in the preliminary design phase. In the case of modern fast foiling sailing yachts, the appendages accomplish both the task of lifting up the boat and to make possible upwind sailing by contributing balance to the sail side force and the heeling moment. Furthermore, their operative design conditions derive from the global equilibrium of forces and moments acting on the system which might vary in a very wide range of values. The result is a design problem defined by a large number of variables operating in a wide design space. In this scenario, the device performing in all conditions has to be identified as a trade-off among several conflicting requirements. One of the most efficient approaches to such a design challenge is to combine multi-objective optimization strategies with experienced aerodynamic design. This paper presents a numerical optimization procedure suitable for foiling multihulls. As a proof of concept, it reports, as an application, the foils design of an A-Class catamaran. The key point of the method is the combination of opportunely developed analytical models of the hull forces with high fidelity multiphase analyses in both upwind and downwind sailing conditions. The analytical formulations were tuned against a database of multiphase analyses of a reference demihull at several attitudes and displacements. An aspect that significantly contributes to both efficiency and robustness of the method is the approach adopted to the geometric parametrization of the foils which was implemented by a mesh morphing technique based on Radial Basis Functions.

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“…Every technique has its own strengths and weaknesses. Thus many research groups are trying either to develop tuning parameters of the methods that is currently in use or introduce new metamodels [19][20][21][22]. In the literature there is variety of different studies that uses metamodeling from chemical industry [23] to aerospace [24] or bio-inspired robots [25].…”

Section: Introductionmentioning

confidence: 99%

Multi-Dimensional Surrogate Based Aft Form Optimization of Ships Using High Fidelity Solvers

Solak

2020

brod

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Surrogate (metamodel) based optimization has numerous potential applications in the field of naval architecture. It is aimed here to establish a methodology for the aft form optimization for minimum viscous resistance, thus the present study is focused on the aft form where the viscous effects become dominant. It is necessary to solve this problem within acceptable time span from practical naval architectural point of view which requires metamodeling techniques currently under investigation. Accordingly, the present paper investigates the metamodeling ability of the Kriging interpolation and attempts to explore its capabilities and limitations in the aft form optimization from viscous resistance point of view. As metamodeling techniques become more widely used, their constraints are more apparent. Especially in highly nonlinear design spaces, the effect of dimensionality should be taken into consideration. Taking all those factors into account, the present paper is to examine the capabilities of Kriging and to establish the learning performance in terms of RMS error, correlation coefficient and required number of training points according to selected optimization algorithm for multidimensional ship design problem. The results show that, at least 5% reduction in viscous pressure drag can be attained by the present optimization methodology.

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Multi-fidelity optimization of a high-speed foil-assisted semi-planing catamaran for low wake

Cited by 21 publications

References 10 publications

Numerical analysis of the interference effects on resistance, sinkage and trim of a fast catamaran

Numerical analysis of the interference effects on resistance, sinkage and trim of a fast catamaran

Combining Analytical Models and Mesh Morphing Based Optimization Techniques for the Design of Flying Multihulls Appendages

Multi-Dimensional Surrogate Based Aft Form Optimization of Ships Using High Fidelity Solvers

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