ABSTRACT

This study is designed to participate in the Collaborative Computational Project in Wave Structure Interaction (CCP-WSI) Blind Test Series 4. This test consists of three cases, all involving a submerged flexible membrane subjected to a focused wave event. We employed the Parallel Partitioned Multi-physics Simulation Framework (ParaSiF) code to participate in the blind test. The results presented in this paper represent a preliminary exploration of the problem. Decoupled simulations were carried out in this paper to fine-tune the fluid and structure solvers separately with the premise that the ParaSiF framework already provides a working coupled solution once both aspects are well formed.

INTRODUCTION

Several researchers have investigated the interactions of waves with a submerged flexible membrane towards a high-efficiency wave energy convertor. French applied for a patent on a wave energy conversion device using flexible membranes as early as 1979 (French, 1979). Recently, due to the blooming of the renewable energy industry, the submerged flexible membranes as wave energy converters have re-entered the attention of researchers. There are over 20 designs on wave energy convertors by utilizing a membrane as part of the device, making it a major trend in wave energy designs (Collins et al., 2021). Accurately predicting the responses of flexible offshore structures that interact with waves is crucial to ensure safe and cost-effective design. To address fluid-structure interaction (FSI) problems, a range of theoretical models have been developed and implemented in numerical models and software. In order to evaluate the accuracy, efficiency, and reliability of various models for practical applications, a CCP-WSI blind test was conducted (CCP-WSI Blind Test Series 4, n.d.). This test involved submerged flexible membrane cases subjected to focused wave events. A number of open test cases are also available to enable the characterisation of the structural properties and the hydrodynamic conditions. We will employ the recently developed Parallel Partitioned Multi-physics Simulation Framework (ParaSiF) (Liu et al., 2022) to enable multiphase FSI simulations to simulate these test cases. A finite volume based Computational Fluid Dynamics (CFD) solver and a finite element-based Computational Structural Mechanics (CSM) solver will be used and coupled together through a high-performance general-purpose coupling library.

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