TY - JOUR
T1 - Contribution of coastal structures to wave force attenuation
T2 - A numerical investigation of fluid-structure interaction for partially perforated caissons
AU - Aliyari, Mohammadreza
AU - Amini, Erfan
AU - Attarnejad, Reza
AU - Marsooli, Reza
N1 - Publisher Copyright:
© 2023 Elsevier Ltd
PY - 2023/7/15
Y1 - 2023/7/15
N2 - Perforated caissons are increasingly used as an advanced solution for seawalls and breakwaters, even in open, rough seas. Despite their widespread implementation, challenges remain in accurately calculating wave forces acting on these structures. Furthermore, the applicability of common design formulas for determining wave forces on perforated caissons under various hydrodynamic conditions is not fully understood. In this study, the commercial CFD package FLUENT™ is employed to perform three-dimensional RANS-VOF numerical simulations of a partially perforated caisson on a rubble-mound foundation. The numerical model is evaluated from different viewpoints, including the generation of nonlinear waves, interaction between waves and common coastal structures (solid vertical walls) and finally, wave-perforated caisson interactions. A good agreement was obtained between the present model results and previous theoretical and laboratory results. The model is then utilized to qualitatively investigate wave-structure interactions through free surface levels, eddy viscosity, and spatial pressure distributions during various phases of interaction. Furthermore, the applicability of common design formulas and the perforated caisson's performance are thoroughly examined under a wide range of parameters affecting the horizontal wave force on the structure, including rubble mound height, wavelength, wave height, water depth, and berm width. The study finds that the Takahashi formula shows some discrepancies in wave force predictions, while the Tabet-Aoul method struggles to accurately predict wave forces on the front wall of the perforated caisson. The DUT's methods perform well only within the assumptions used in their developments. This research also investigates the effect of different design parameters on the forces acting on the perforated caissons and provides insights into the strengths and limitations of each design formula and discusses the conditions under which partially perforated caissons demonstrate optimal performance compared to conventional solid caissons. This information will aid engineers in determining accurate horizontal wave forces exerted on partially perforated caissons, ultimately contributing to more effective and efficient designs.
AB - Perforated caissons are increasingly used as an advanced solution for seawalls and breakwaters, even in open, rough seas. Despite their widespread implementation, challenges remain in accurately calculating wave forces acting on these structures. Furthermore, the applicability of common design formulas for determining wave forces on perforated caissons under various hydrodynamic conditions is not fully understood. In this study, the commercial CFD package FLUENT™ is employed to perform three-dimensional RANS-VOF numerical simulations of a partially perforated caisson on a rubble-mound foundation. The numerical model is evaluated from different viewpoints, including the generation of nonlinear waves, interaction between waves and common coastal structures (solid vertical walls) and finally, wave-perforated caisson interactions. A good agreement was obtained between the present model results and previous theoretical and laboratory results. The model is then utilized to qualitatively investigate wave-structure interactions through free surface levels, eddy viscosity, and spatial pressure distributions during various phases of interaction. Furthermore, the applicability of common design formulas and the perforated caisson's performance are thoroughly examined under a wide range of parameters affecting the horizontal wave force on the structure, including rubble mound height, wavelength, wave height, water depth, and berm width. The study finds that the Takahashi formula shows some discrepancies in wave force predictions, while the Tabet-Aoul method struggles to accurately predict wave forces on the front wall of the perforated caisson. The DUT's methods perform well only within the assumptions used in their developments. This research also investigates the effect of different design parameters on the forces acting on the perforated caissons and provides insights into the strengths and limitations of each design formula and discusses the conditions under which partially perforated caissons demonstrate optimal performance compared to conventional solid caissons. This information will aid engineers in determining accurate horizontal wave forces exerted on partially perforated caissons, ultimately contributing to more effective and efficient designs.
KW - Coastal resilience
KW - Coastal structure
KW - Computational fluid dynamics
KW - Flood mitigation
KW - Numerical simulation
KW - Partially perforated caissons (PPCs)
KW - Wave force attenuation
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U2 - 10.1016/j.oceaneng.2023.114745
DO - 10.1016/j.oceaneng.2023.114745
M3 - Article
AN - SCOPUS:85162753238
SN - 0029-8018
VL - 280
JO - Ocean Engineering
JF - Ocean Engineering
M1 - 114745
ER -