English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Tidal stream power generation represents a promising source of renewableenergy. In order to extract an economically useful amount of power, tens tohundreds of tidal turbines need to be placed within an array. The layout ofthese turbines can have a significant impact on the power extracted and henceon the viability of the site. Funke et al. formulated the question of the bestturbine layout as an optimisation problem constrained by the shallow waterequations and solved it using a local, gradient-based optimisation algorithm.Given the local nature of this approach, the question arises of how optimal thelayouts actually are. This becomes particularly important for scenarios withcomplex bathymetry and layout constraints, both of which typically introducelocally optimal layouts. Optimisation algorithms which find the global optimagenerally require orders of magnitude more iterations than local optimisationalgorithms and are thus infeasible in combination with an expensive flow model.This paper presents an analytical wake model to act as an efficient proxy tothe shallow water model. Based upon this, a hybrid global-local two-stageoptimisation approach is presented in which turbine layouts are first optimisedwith the analytical wake model via a global optimisation algorithm, and furtheroptimised with the shallow water model via a local gradient-based optimisationalgorithm. This procedure is applied to a number of idealised cases and a morerealistic case with complex bathymetry in the Pentland Firth, Scotland. It isshown that in cases where bathymetry is considered, the two-stage optimisationprocedure is able to improve the power extracted from the array by as much as25% compared to local optimisation for idealised scenarios and by as much as12% for the more realistic Pentland Firth scenario whilst in many casesreducing the overall computation time by approximately 35%.

Hybrid global-local optimisation algorithms for the layout design of tidal turbine arrays