Hull geometry optimisation of wave energy converters: On the choice of the optimisation algorithm and the geometry definition

A review of geometry optimisation of wave energy converters

“…For categories not mentioned here, no geometry studies were available to the knowledge of the authors. point absorbersingle bodyfloating [33], [34], [35], [36], [37], [38], [39], [40], [41], [42], [43], [26], [44], [45], [46], [47], [48], [49], [50] [51], [52], [53], [54], [55], [56], [57], [58], [59], [60], [61], [62], [63] B point absorbersingle bodysubmerged [64], [65], [66] [67], [68], [69] C point absorbertwo body [70], [71], [72] [73], [74], [56],…”

Fast nonlinear Froude–Krylov force calculation for prismatic floating platforms: a wave energy conversion application case

“…However, in order to define a single curve (instead of a piece-wise composition of three curves), a Bezier curve has been fitted to the profile. Bezier curves are generic parametric curves and a flexible tool to represent complex geometries (Garcia-Teruel et al 2020).…”

“…The novel contribution of this paper is to provide a fast NLFK force computation framework, based on the analytical representation of the wetted surface of generic prismatic floaters. State-of-the-art mesh-based NLFK models, although able to handle geometries of arbitrary complexity, are too slow to be applied for computationally demanding tasks, such as power production assessment and control; moreover, mesh-based approaches are less transparent then fully-analytical models: based on a closed-form analytical description of the wetted surface, it is possible to apply advanced model-order reduction techniques (Faedo et al 2020a) and geometry-based optimizations (Garcia-Teruel et al 2020). The modelling approach has been validated against experimental data for an application based on an axisymmetric wave energy converter (Giorgi et al 2020b), providing confidence that such a mathematical framework is appropriate to describe the dynamics also of a pitching wave energy converter under operational conditions, excluding extreme events.…”

Reliability‐based hull geometry optimisation of a point‐absorber wave energy converter with power take‐off structural reliability objectives

“…A more adaptable method able of generating diverse shapes was developed by McCabe et al [9,10], which employs bi-cubic Bspline surfaces to represent the submerged hull. This approach was expanded by Garcia-Teruel et al to be applicable in multiple degrees-of-freedom [11] and to ensure robustness of the method for a number of applications [12]. In these latter studies, costs were represented through the hull's submerged surface area and submerged volume, but reliability was not considered.…”

“…We assume the PTO system is composed of a moving rod welded to the floating body and a fixed component. The geometry is defined so that diverse shapes can be generated through the optimisation approach introduced by McCabe FIGURE 3 Polyhedron with numbered vertices v n and example representations of the interpolated control points in grey [26] et al [10]. The results of the optimisation are compared to a static non-optimised barge shape with dimensions chosen so that its draft (10 m) and characteristic width (20 m) are comparable to the generated, optimal hull shapes.…”