Mechanical and hydrodynamic characteristics of emerged porous Gyroid breakwaters based on triply periodic minimal surfaces

Abstract

Porous structures with controllable mechanical and hydrodynamic characteristics are prospective candidates for coastal engineering applications. In this paper, a novel emerged porous breakwater based on triply periodic minimal surface (TPMS) cellular structure is proposed. Mechanical behaviour of TPMS structures is analyzed by conducting uniaxial compressive tests for cubic specimens made of cementious material. Numerical finite element method (FEM) is also employed to evaluate mechanical characteristics of cellular structures and then compared them with experimental results. The results show that experimental and numerical approaches well agree. In addition, the mechanical performance of the gyroid cellular structures is better than lattice ones. A 5% change in porosity of Gyroid structure led to an average 5% change in the maximum load obtained, which is expected mechanical behaviour. The Gyroid cellular structure is therefore considered for breakwaters application. Computational fluid dynamics (CFD) simulation through FLUENT is adopted to assess interactions of solitary wave and emerged porous breakwaters based on Gyroid-TPMS. The CFD simulation results show that incident wave reduces approximately by 50% after approaching the porous structure with a porosity of 50%. Besides, the percentage change in the porosity affected the wave transmission coefficients and the wave-induced forces on the structure (5%, 10%, and 15% respectively). A pilot design of a Gyroid breakwater structure with a pile-supported system as a novel solution is suggested.