ABSTRACT

In recent years, there has been growing interest in the use of the flexible membrane-type structures as floating breakwaters or wave energy absorption devices. Thus, it is of high importance to study the reliability and survivability of these flexible membrane structures during their interactions with waves. In this paper, a 2-D numerical method based on SPH including a hybrid model for wave generating and a simple fluid-structure interface method is presented to simulate the focused wave interactions with a submerged flexible membrane. In order to understand the true predictive capability of the numerical model, the presented numerical model will be applied to the CCP-WSI Blind Test Series 4 on modelling focused wave interactions with a submerged flexible membrane. More validations for the numerical model will be conducted after the release of experimental data including the wave surface elevation with the membrane structure and the membrane deformation under wave action.

INTRODUCTION

In recent years, there is great interest in utilizing the floating/submerged flexible membrane-type structure as breakwater for protection of coastal areas or as part of the Wave Energy Converter device (Collins et al., 2021). Therefore, there is a need to understand the mechanics of wave-flexible membrane interaction, especially the wave-induced responses and deformation of the membrane structure.

In the past few years, some numerical studies for wave interaction with floating and submerged flexible membrane were carried out. Karmakar and Guedes Soares (2012) investigated the interaction of oblique incident wave with a moored floating membrane as a breakwater based on the linearized water wave theory. Koley and Sahoo (2017) studied the scattering of obliquely incident surface gravity waves with a submerged permeable vertical flexible membrane barrier in water of finite depth based on three-dimensional linear water wave theory. Liu and Huang (2019) presented a time-domain potential flow solver based on a Lagrangian-Eulerian formulation for fully nonlinear waves interacting with a fluid-filled membrane mounted on the seabed. Guo et al. (2020) presented an analytical model for studying the oblique wave interaction with submerged horizontal flexible porous membrane under small amplitude water wave theory and membrane response in finite water depth. Koley et al. (2022) have adopted Dual boundary element method for solving the problem of water wave interaction with the flexible membrane in conjunction with a thick porous barrier for efficient attenuation of waves near a partially reflecting sea wall.

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