A 3D boundary element method for analysing the hydrodynamic performance of a land-fixed oscillating water column device. (May 2022)

• Record Type: Journal Article
• Authors: Medina Rodríguez, Ayrton Alfonso; Silva Casarín, Rodolfo; Blanco Ilzarbe, Jesús María
• Is Part Of: Engineering analysis with boundary elements. Volume 138(2022)
• Page Start: 407
• Page End: 422
• Publication Date: 2022-05
• Subjects: Oscillating water column -- Linear water waves -- Boundary element method -- Hydrodynamic performance -- Capture width -- Free surface elevation; Boundary element methods -- Periodicals; Engineering mathematics -- Periodicals; Équations intégrales de frontière, Méthodes des -- Périodiques; Mathématiques de l'ingénieur -- Périodiques; Boundary element methods; Engineering mathematics; Periodicals; 620.00151
• DOI: 10.1016/j.enganabound.2022.02.014
• Languages: English
• ISSNs: 0955-7997

Abstract

Abstract: In this work, the theoretical hydrodynamic performance of an onshore Oscillating Water Column (OWC) device, subjected to normal wave incidence, is investigated. Based on linear surface-wave theory, the full solution of the boundary value problem (BVP) is obtained by using a three-dimensional (3D) boundary element method (BEM) with nine-noded quadrilateral elements. The method of subdomains is used to solve the BVP by applying the BEM separately to each of its regions, and the continuity of velocity potential and flux are used to match the problem. The capture width, hydrodynamical coefficients and free surface elevations are analysed for different OWC geometric parameters of the chamber. Numerical results for the hydrodynamic performance were found to be in good agreement with cases reported elsewhere. The findings show that the chamber configuration and the linearized air compressibility have a significant impact on the capture width bandwidth, the resonant frequency and the free surface elevation within the chamber. Highlights: 3D interaction of water waves with a land-fixed OWC device. 3D BEM with nine-noded quadrilateral elements. The hydrodynamic performance is influenced by the OWC geometrical configuration. The air compressibility notably affects the bandwidth of the capture width curves.