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Dissertation
Master thesis : The Hull Optimisation for an Open 60 IMOCA Single Handed Race yacht
Authors: --- --- --- ---
Year: 2022 Publisher: Liège Université de Liège (ULiège)

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Abstract

This paper investigates the benefits of using modern foils on an IMOCA 60 sailing boat. This was achieved for a designed IMOCA hull form, and designed foils, using different approaches.

A parametric study and researches on existing IMOCA 60 was first realised. Different hull forms were then modelled in the nurbs-based hull form modelling software Maxsurf. They were investigated through VPP analyses to determine the fastest design. Two of them are the reversed engineered hull forms of Hugo Boss and L'Occitane. They were used as reference to validate the design, by comparing the boat speeds found using the designed hull and these reference ones, in various sailing configurations (headings and wind speeds) chosen in the VPP.

The selected hull form design was manufactured at model scale (1:10) using composite materials, to be tank tested with its keel and foil. Tank tests were realised with and without the foil, at different boat speeds, heel angles, and leeway angles. The data recorded during the tests comprises the total drag, the side force, the roll (or righting) moment, the heave, and the pitch of the boat.
The data measured without foil was subtracted from the one measured with foil, which allowed to determine the effect of the foil on the boat. 

Meanwhile, a theoretical model was developed under the assumptions of the lifting-line theory, to try to predict the hydrodynamic forces generated by the designed foil, and their influence on the overall righting moment of the boat. The results were compared to the experimental foil results, which allowed to validate the model.

Finally, “direct experimental“ VPP analyses were performed based on the experimental data found with and without foil. It enabled to find the gains in boat speed due to the foil, in various sailing configurations. The influence of the righting lever ($GZ$) was also investigated.

%Add the main findings!!
After two iterations including a re-design process, the designed hull form proved to be relatively fast compared to the reversed engineered hull forms. 
Moreover, it was found that the developed theoretical model provides realistic trends when compared to the experimental foil results. The theoretical foil results generally overestimated the experimental ones, which means that the foil was slightly less efficient than predicted in theory. 
The direct experimental VPP analyses showed that the designed foils globally increased the boat speeds, when the increase in $GZ$ was accounted for. 
However, a few boat speeds were smaller with foil than without it, regardless of the $GZ$ values used. It was found to correspond to configurations (boat speeds, heel, and leeway angles) in which the foil ventilated in the tank.
The downwind speeds were unchanged since the foil was not immersed at the corresponding small heel angles. Hence, a design modification was proposed to solve that issue, and also benefit from the lift of the foils when sailing downwind.


Book
Advanced Techniques for Design and Manufacturing in Marine Engineering
Authors: ---
Year: 2022 Publisher: Basel MDPI - Multidisciplinary Digital Publishing Institute

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Abstract

Modern engineering design processes are driven by the extensive use of numerical simulations; naval architecture and ocean engineering are no exception. Computational power has been improved over the last few decades; therefore, the integration of different tools such as CAD, FEM, CFD, and CAM has enabled complex modeling and manufacturing problems to be solved in a more feasible way. Classical naval design methodology can take advantage of this integration, giving rise to more robust designs in terms of shape, structural and hydrodynamic performances, and the manufacturing process.This Special Issue invites researchers and engineers from both academia and the industry to publish the latest progress in design and manufacturing techniques in marine engineering and to debate the current issues and future perspectives in this research area. Suitable topics for this issue include, but are not limited to, the following:CAD-based approaches for designing the hull and appendages of sailing and engine-powered boats and comparisons with traditional techniques;Finite element method applications to predict the structural performance of the whole boat or of a portion of it, with particular attention to the modeling of the material used;Embedded measurement systems for structural health monitoring;Determination of hydrodynamic efficiency using experimental, numerical, or semi-empiric methods for displacement and planning hulls;Topology optimization techniques to overcome traditional scantling criteria based on international standards;Applications of additive manufacturing to derive innovative shapes for internal reinforcements or sandwich hull structures.


Book
Advanced Techniques for Design and Manufacturing in Marine Engineering
Authors: ---
Year: 2022 Publisher: Basel MDPI - Multidisciplinary Digital Publishing Institute

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Abstract

Modern engineering design processes are driven by the extensive use of numerical simulations; naval architecture and ocean engineering are no exception. Computational power has been improved over the last few decades; therefore, the integration of different tools such as CAD, FEM, CFD, and CAM has enabled complex modeling and manufacturing problems to be solved in a more feasible way. Classical naval design methodology can take advantage of this integration, giving rise to more robust designs in terms of shape, structural and hydrodynamic performances, and the manufacturing process.This Special Issue invites researchers and engineers from both academia and the industry to publish the latest progress in design and manufacturing techniques in marine engineering and to debate the current issues and future perspectives in this research area. Suitable topics for this issue include, but are not limited to, the following:CAD-based approaches for designing the hull and appendages of sailing and engine-powered boats and comparisons with traditional techniques;Finite element method applications to predict the structural performance of the whole boat or of a portion of it, with particular attention to the modeling of the material used;Embedded measurement systems for structural health monitoring;Determination of hydrodynamic efficiency using experimental, numerical, or semi-empiric methods for displacement and planning hulls;Topology optimization techniques to overcome traditional scantling criteria based on international standards;Applications of additive manufacturing to derive innovative shapes for internal reinforcements or sandwich hull structures.


Book
Advanced Techniques for Design and Manufacturing in Marine Engineering
Authors: ---
Year: 2022 Publisher: Basel MDPI - Multidisciplinary Digital Publishing Institute

Loading...
Export citation

Choose an application

Bookmark

Abstract

Modern engineering design processes are driven by the extensive use of numerical simulations; naval architecture and ocean engineering are no exception. Computational power has been improved over the last few decades; therefore, the integration of different tools such as CAD, FEM, CFD, and CAM has enabled complex modeling and manufacturing problems to be solved in a more feasible way. Classical naval design methodology can take advantage of this integration, giving rise to more robust designs in terms of shape, structural and hydrodynamic performances, and the manufacturing process.This Special Issue invites researchers and engineers from both academia and the industry to publish the latest progress in design and manufacturing techniques in marine engineering and to debate the current issues and future perspectives in this research area. Suitable topics for this issue include, but are not limited to, the following:CAD-based approaches for designing the hull and appendages of sailing and engine-powered boats and comparisons with traditional techniques;Finite element method applications to predict the structural performance of the whole boat or of a portion of it, with particular attention to the modeling of the material used;Embedded measurement systems for structural health monitoring;Determination of hydrodynamic efficiency using experimental, numerical, or semi-empiric methods for displacement and planning hulls;Topology optimization techniques to overcome traditional scantling criteria based on international standards;Applications of additive manufacturing to derive innovative shapes for internal reinforcements or sandwich hull structures.

Keywords

Technology: general issues --- History of engineering & technology --- wave compensation platform --- 3-SPR parallel platform --- 3-RPS parallel platform --- structure optimization --- workspace analysis --- level 4 sea state --- cryogenic tank --- boil-off gas (BOG) --- boil-off rate (BOR) --- finite element analysis (FEA) --- liquid nitrogen --- near-bottom zooplankton --- multi-net --- visible sampling --- fidelity --- deep sea --- sailing yacht design --- rational Bézier curves --- VBA --- excel --- CAD --- VPP --- computational fluid dynamics --- hull design --- air cavity ships --- hull ventilation --- stepped planing hull --- Cartesian adaptive grids --- immersed boundaries --- LES simulation --- velocity prediction program --- numerical optimization --- High-Fidelity analysis --- geometric parameterization --- multihull design --- finite element method --- FSI --- sail design --- gennaker --- sail loads --- biomimetic design --- lightweight structure --- computer fluid dynamics --- design for additive manufacturing --- autonomous underwater vehicle (AUV) --- collision avoidance planning --- deep reinforcement learning (DRL) --- double-DQN (D-DQN) --- computational model --- oscillating water column --- wave energy converter --- turbulent flows --- Savonius turbine --- wave compensation platform --- 3-SPR parallel platform --- 3-RPS parallel platform --- structure optimization --- workspace analysis --- level 4 sea state --- cryogenic tank --- boil-off gas (BOG) --- boil-off rate (BOR) --- finite element analysis (FEA) --- liquid nitrogen --- near-bottom zooplankton --- multi-net --- visible sampling --- fidelity --- deep sea --- sailing yacht design --- rational Bézier curves --- VBA --- excel --- CAD --- VPP --- computational fluid dynamics --- hull design --- air cavity ships --- hull ventilation --- stepped planing hull --- Cartesian adaptive grids --- immersed boundaries --- LES simulation --- velocity prediction program --- numerical optimization --- High-Fidelity analysis --- geometric parameterization --- multihull design --- finite element method --- FSI --- sail design --- gennaker --- sail loads --- biomimetic design --- lightweight structure --- computer fluid dynamics --- design for additive manufacturing --- autonomous underwater vehicle (AUV) --- collision avoidance planning --- deep reinforcement learning (DRL) --- double-DQN (D-DQN) --- computational model --- oscillating water column --- wave energy converter --- turbulent flows --- Savonius turbine

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