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Wave overtopping analysis by an enhanced SPH method considering the porosity structure of wave-dissipating blocks.

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Title: Wave overtopping analysis by an enhanced SPH method considering the porosity structure of wave-dissipating blocks.
Authors: Gotoh, Takafumi1 (AUTHOR) taka.gotoh@ku.pmres.jp, Tsuruta, Naoki2 (AUTHOR), Yamanaka, Shun3 (AUTHOR), Khayyer, Abbas3 (AUTHOR), Gotoh, Hitoshi3 (AUTHOR)
Source: Coastal Engineering Journal. Dec2025, Vol. 67 Issue 4, p609-624. 16p.
Subjects: Particle methods (Numerical analysis), Hydraulic structures, Computer simulation, Flow velocity, Computational fluid dynamics, Hydraulic models, Water waves, Coastal engineering
Abstract: In the modeling of wave-dissipating blocks for wave overtopping simulations over wave-dissipating block seawall, the so-called porous models have been widely used. In conventional porous models, resistance for fluid is evaluated by applying semi-empirical experimental constants to the target permeable area, neglecting local flow velocities through the gaps between the blocks. This results in poor reproducibility, especially under wave-breaking conditions where complex flow through the gaps between the block becomes prominent. To address this issue and to reproduce the complex local flow field within the wave-dissipating blocks area, this study proposes a novel permeable boundary model that explicitly represents the shielding regions and flow channels by a group of blocks and thereby aims to achieve an enhanced wave overtopping simulation targeting a seawall with wave-dissipating blocks with a practical computational load. In the proposed model, the 3-D arrangement characteristics of individual wave-dissipating blocks are projected onto a 2-D cross-section, and the boundaries of the flow paths between the blocks are given by fixed particles. The proposed model is implemented into a particle method, and simulations of wave overtopping over wave-dissipating block seawalls are conducted to verify the reproducibility of overtopping flow rates and an observed process of wave overtopping. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:In the modeling of wave-dissipating blocks for wave overtopping simulations over wave-dissipating block seawall, the so-called porous models have been widely used. In conventional porous models, resistance for fluid is evaluated by applying semi-empirical experimental constants to the target permeable area, neglecting local flow velocities through the gaps between the blocks. This results in poor reproducibility, especially under wave-breaking conditions where complex flow through the gaps between the block becomes prominent. To address this issue and to reproduce the complex local flow field within the wave-dissipating blocks area, this study proposes a novel permeable boundary model that explicitly represents the shielding regions and flow channels by a group of blocks and thereby aims to achieve an enhanced wave overtopping simulation targeting a seawall with wave-dissipating blocks with a practical computational load. In the proposed model, the 3-D arrangement characteristics of individual wave-dissipating blocks are projected onto a 2-D cross-section, and the boundaries of the flow paths between the blocks are given by fixed particles. The proposed model is implemented into a particle method, and simulations of wave overtopping over wave-dissipating block seawalls are conducted to verify the reproducibility of overtopping flow rates and an observed process of wave overtopping. [ABSTRACT FROM AUTHOR]
ISSN:21664250
DOI:10.1080/21664250.2025.2531704