Wave interactions with multi-float structures: SPH model, experimental validation, and parametric study

He, Ming; Liang, Dongfang; Ren, Bing; Li, Jiaye; Shao, Songdong

doi:10.1016/j.coastaleng.2023.104333

Cited by 26 publications

(4 citation statements)

References 72 publications

(74 reference statements)

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“…The calculated density is further smoothed by the mean density of fluid particles within the kernel support ( Cheng et al, 2021 ) as Eq. 17 :

where subscripts k and i refer to a DBP and its neighbouring fluid particle, respectively; subscript z denotes the vertical component;

is the corrected density; N p is the total number of fluid particles within the kernel support; χ is a weighted coefficient varying from 0 to 0.5 ( He et al, 2021 ; He et al, 2023 ).…”

Section: Methodsmentioning

confidence: 99%

“…where subscripts k and i refer to a DBP and its neighbouring fluid particle, respectively; subscript z denotes the vertical component; ρk is the corrected density; N p is the total number of fluid particles within the kernel support; χ is a weighted coefficient varying from 0 to 0.5 (He et al, 2021;He et al, 2023). DBPs at the channel bottom are not included in Eq.…”

Section: Solid Boundarymentioning

confidence: 99%

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Analysis of fluid force and flow fields during gliding in swimming using smoothed particle hydrodynamics method

Liu,

Yu,

Meng

et al. 2024

Front. Bioeng. Biotechnol.

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Gliding is a crucial phase in swimming, yet the understanding of fluid force and flow fields during gliding remains incomplete. This study analyzes gliding through Computational Fluid Dynamics simulations. Specifically, a numerical model based on the Smoothed Particle Hydrodynamics (SPH) method for flow-object interactions is established. Fluid motion is governed by continuity, Navier-Stokes, state, and displacement equations. Modified dynamic boundary particles are used to implement solid boundaries, and steady and uniform flows are generated with inflow and outflow conditions. The reliability of the SPH model is validated by replicating a documented laboratory experiment on a circular cylinder advancing steadily beneath a free surface. Reasonable agreement is observed between the numerical and experimental drag force and lift force. After the validation, the SPH model is employed to analyze the passive drag, vertical force, and pitching moment acting on a streamlined gliding 2D swimmer model as well as the surrounding velocity and vorticity fields, spanning gliding velocities from 1 m/s to 2.5 m/s, submergence depths from 0.2 m to 1 m, and attack angles from −10° to 10°. The results indicate that with the increasing gliding velocity, passive drag and pitching moment increase whereas vertical force decreases. The wake flow and free surface demonstrate signs of instability. Conversely, as the submergence depth increases, there is a decrease in passive drag and pitching moment, accompanied by an increase in vertical force. The undulation of the free surface and its interference in flow fields diminish. With the increase in the attack angle, passive drag and vertical force decrease whereas pitching moment increases, along with the alteration in wake direction and the increasing complexity of the free surface. These outcomes offer valuable insights into gliding dynamics, furnishing swimmers with a scientific basis for selecting appropriate submergence depth and attack angle.

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“…The calculated density is further smoothed by the mean density of fluid particles within the kernel support ( Cheng et al, 2021 ) as Eq. 17 :

where subscripts k and i refer to a DBP and its neighbouring fluid particle, respectively; subscript z denotes the vertical component;

is the corrected density; N p is the total number of fluid particles within the kernel support; χ is a weighted coefficient varying from 0 to 0.5 ( He et al, 2021 ; He et al, 2023 ).…”

Section: Methodsmentioning

confidence: 99%

Section: Solid Boundarymentioning

confidence: 99%

Analysis of fluid force and flow fields during gliding in swimming using smoothed particle hydrodynamics method

Liu,

Yu,

Meng

et al. 2024

Front. Bioeng. Biotechnol.

Self Cite

View full text Add to dashboard Cite

show abstract

“…It represents the ratio of transmitted wave height to incident wave height and serves as a measure of FBW performance. Various structural and hydrodynamic factors influence the wave-transmission coefficient and have been the focus of research by many scientists in this field [14,15]. Floating breakwaters effectively reduce wave energy and erosion.…”

Section: Introductionmentioning

confidence: 99%

Enhancing Hydrodynamic Performance of Floating Breakwaters Using Wing Plates

Al-Sairafi,

Zhang,

Jiang

et al. 2024

Water

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Understanding the dynamic response of floating breakwaters to wave forces is essential for optimizing their design and improving coastal protection. The response amplitude operator serves as a key parameter in accurately predicting the structural response amplitudes at different frequencies and wave angles. By incorporating this knowledge, adjustments can be made to enhance the effectiveness of floating breakwaters. In this study, a comprehensive 3D model of the mooring system is developed to simulate its behavior under various wave and current conditions. The model takes into account critical design factors such as pontoon shapes, anchor types, placements, and configurations. Through simulations, valuable insights are obtained regarding the performance of the wing-plate floating breakwater mooring system across different operational settings. These findings contribute to the optimization of floating breakwaters and their ability to protect coastlines from wave impacts.

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“…The wave structure interactions are widely concerned in the marine science (Wang et al, 2011;Wang et al, 2013;Ding et al, 2020;Gao et al, 2020;Gao et al, 2021b;Gao et al, 2023;He et al, 2023) due to its significant effects on the safety and disaster prevention of marine and coastal engineering. For example, Sampath et al (2016) simulated the large-scale solitary with incompressible SPH method.…”

Section: Introductionmentioning

confidence: 99%

Verification of solitary wave numerical simulation and case study on interaction between solitary wave and semi-submerged structures based on SPH model

Lin,

Hu,

et al. 2023

Front. Mar. Sci.

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Due to significant influence on the safety of marine structures, the interaction between extreme waves and structures is a crucial area of study in marine science. This paper focus on the verification of a solitary wave meshless SPH model and the application of the model on the interaction between solitary waves and semi-submersible structures. A solitary wave propagation model is established based on the SPH method combined with Rayleigh solitary wave theory, quintic kernel function, artificial viscosity, and Symplectic Method. The accuracy of the model is validated by comparing the calculated wave height with the theoretical value. The calculated results with relative particle spacing H0/d0 ≥ 20 are in good agreement with the analytical solution. The simulated solitary wave is also quite stable with a maximum L2 error 0.016. Therefore, the proposed SPH model can accurately simulate the propagation of the solitary waves. A case study on the interaction between solitary waves and semi-submersible platforms is conducted. The results show that the interaction between solitary waves and semi-submersible causes two double peaks with wave heights of 0.398 m and 0.410 m, respectively, induced by overtopping at the center of the platform. The wave transmission coefficient Kt is 0.880 due to that the solitary wave height reduces from 0.498 m to 0.438 m after the solitary wave propagates through the semi-submersible structure. In addition, the solitary wave induces significant vertical wave loads of the structure with a load amplitude of 0.688, while horizontal wave loads are relatively small with a load amplitude of 0.089. The solitary wave arrived the structure induces the upstream and downstream overtopping and forms a hydraulic jump leading to the complex flow field. The maximum velocity at the top and bottom of the structure is 2.2 m/s and 0.8 m/s respectively. Positive or negative vortex are formed at the bottom of the leading edge, top and downstream of the structure with the maximum intensity 28 s-1 and -40 s-1. In a word, the meshless SPH model can conveniently and accurately simulate the propagation of the solitary waves, and be applied to the investigation of the wave height, velocity, vorticity, wave load, and wave breaking of the interaction between solitary waves and structures in ocean engineering.

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Wave interactions with multi-float structures: SPH model, experimental validation, and parametric study

Cited by 26 publications

References 72 publications

Analysis of fluid force and flow fields during gliding in swimming using smoothed particle hydrodynamics method

Analysis of fluid force and flow fields during gliding in swimming using smoothed particle hydrodynamics method

Enhancing Hydrodynamic Performance of Floating Breakwaters Using Wing Plates

Verification of solitary wave numerical simulation and case study on interaction between solitary wave and semi-submerged structures based on SPH model

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