CN-122021452-A - Wave characteristic numerical simulation method and system for transparent breakwater structure

CN122021452ACN 122021452 ACN122021452 ACN 122021452ACN-122021452-A

Abstract

The invention relates to the technical field of ocean engineering, and discloses a wave characteristic numerical simulation method and system of a permeable breakwater structure. Firstly, establishing a numerical model of a permeable breakwater structure, wherein the numerical model comprises pile foundation arrangement and geometric parameters of a breakwater body, then setting wave condition parameters and structural parameters, wherein the structural parameters comprise pile diameter, pile spacing, depth of water before the breakwater and wave crossing amount, then simulating interaction of waves and the permeable breakwater based on a computational fluid dynamics method, calculating wave transmission coefficients and structural stress, and finally analyzing influence rules of the parameters on the wave transmission coefficients and extracting structural stress distribution under the wave action. According to the invention, the wave characteristics of the transparent breakwater are systematically researched through a numerical simulation method, so that the design efficiency is remarkably improved, the physical experiment cost is reduced while the calculation accuracy is ensured, and a basis is provided for the optimal design of the transparent breakwater.

Inventors

ZHANG GUIPING
BIE SHEAN
LI WEIHAO
LI SHUO
SU TAO
LI XIAONING

Assignees

天津大学
天津水运工程研究院有限公司

Dates

Publication Date: 20260512
Application Date: 20260225

Claims (6)

1. The wave characteristic numerical simulation method of the transparent breakwater structure is characterized by comprising the following steps of: s1, establishing a numerical model of a permeable breakwater structure, wherein the numerical model comprises pile foundation arrangement modes, geometric shapes and sizes of breakwater bodies; s2, setting wave condition parameters including wave height, wave period and wave incidence angle; S3, setting structural parameters including pile diameter, pile spacing, water depth in front of the dike and wave-crossing quantity; S4, simulating the interaction process of waves and the permeable breakwater based on a computational fluid dynamics method; S5, calculating a wave transmission coefficient and structural stress, wherein the wave transmission coefficient is defined as the ratio of the transmitted wave height to the incident wave height, and the structural stress comprises stress distribution of pile foundations and dykes; S6, analyzing the influence rule of pile diameter, pile spacing, water depth in front of the dike and wave crossing quantity on the wave transmission coefficient, and extracting structural stress data under the action of waves; In the step S4, the computational fluid dynamics method adopts a VOF method to track the free liquid level, adopts a k-epsilon turbulence model to simulate wave breaking and energy dissipation, adopts a dynamic time step adjustment strategy in the simulation process, automatically adjusts the time step according to CFL conditions, and adopts a PISO algorithm to carry out pressure-speed coupling solution; in step S5, the wave transmission coefficient is obtained by monitoring the incident wave and the transmitted wave height, and the structural stress is obtained by extracting the stress distribution of pile foundations and dyke bodies through a finite element method; in step S6, through a multi-objective optimization algorithm, the minimum transmission coefficient, the minimum structure maximum stress and the minimum material consumption are simultaneously considered, so that a Pareto optimal solution set is obtained, and the transparent breakwater is optimally designed.
2. A method according to claim 1, wherein in step S1 the numerical model is modeled using three-dimensional geometry, including circular cross-sections of pile foundations and open sections of dykes, and the model mesh is discretized using unstructured mesh.
3. The method according to claim 1, wherein in step S1, the numerical model comprises a calculation domain comprising a wave generation zone, a structural action zone and a wave extinction zone, wherein the wave generation zone is not less than 3 wavelengths long, the wave extinction zone is not less than 5 wavelengths long, and the calculation domain depth is 1.5-2 times the water depth in front of the dike.
4. The method according to claim 1, characterized in that in step S2 the wave condition parameters are defined based on a wave spectrum comprising a PM spectrum or JONSWAP spectrum for generating irregular waves and taking into account oblique incidence situations where the wave incidence angle is in the range of 0 ° to 45 °.
5. A method according to claim 1, wherein in step S3, the pile diameter in the structural parameter ranges from 0.5 to 2 meters, the pile pitch ranges from 1 to 5 meters, and the depth of water in front of the dike ranges from 5 to 20 meters.
6. A wave characteristic numerical simulation system of a permeable breakwater structure implementing the method of any one of claims 1-5, comprising: the model building module is used for building a numerical model of the transparent breakwater structure; the parameter setting module is used for setting wave condition parameters and structure parameters; a simulation calculation module for simulating the interaction of waves with the structure based on a computational fluid dynamics method; and the post-processing module is used for calculating the wave transmission coefficient and structural stress and analyzing the parameter influence rule.

Description

Wave characteristic numerical simulation method and system for transparent breakwater structure Technical Field The invention relates to the technical field of ocean engineering, in particular to a wave characteristic numerical simulation method and system of a permeable breakwater structure. Specifically, the invention provides a comprehensive numerical simulation method based on computational fluid dynamics, which is used for accurately predicting hydrodynamic performance and structural response of the transparent breakwater under the wave action and provides technical support for coastal engineering design and optimization. Background The transparent breakwater is a common coast protection structure, and the transparent breakwater body supported by pile foundations allows partial waves to pass through, so that wave energy is reduced, and ports and coastlines are protected. Compared with the traditional solid breakwater, the transparent breakwater has the advantages of not influencing water body exchange, reducing sediment and reducing structural cost, and is widely applied to coastal engineering in recent years. However, the design of the open breakwater is complex, and the wave characteristics are affected by various parameters, such as pile diameter, pile spacing, depth of water in front of the breakwater, surmounting amount, and the like, which directly affect the transmission coefficient of waves and the stress condition of the structure. The wave transmission coefficient is a key index for evaluating the performance of the breakwater, and is defined as the ratio of the transmitted wave height to the incident wave height, and the smaller the value is, the better the wave-absorbing effect of the breakwater is. Structural stresses are related to the safety and durability of the breakwater and require accurate assessment during the design phase. At present, research on the permeable breakwater mainly depends on physical model experiments and simplified numerical simulation. Physical model experiments measure wave parameters and structural response by constructing a scale model in a water tank, and have the advantages of reliable results, high cost, long period and difficult coverage of all design conditions. Simplified numerical simulation methods, such as calculations based on potential flow theory or empirical formulas, tend to ignore wave nonlinearities, structural details, and fluid-structure interactions, though computationally efficient, resulting in poor accuracy. Particularly under complex wave conditions, such as irregular waves or extreme waves, it is difficult for existing methods to accurately predict wave transmission coefficients and structural stresses. In addition, the existing research focuses on the influence of a single parameter, and lacks system analysis on the synergistic effect of multiple parameters such as pile diameter, pile spacing, water depth, wave crossing amount and the like, which limits the optimal design of the transparent breakwater. Along with the development of computer technology, the computational fluid dynamics method is gradually applied to the field of ocean engineering, and can accurately simulate the interaction of waves and structures. However, the existing computational fluid dynamics (Computational Fluid Dynamics, CFD) model still faces challenges in the application of the transparent breakwater, namely firstly, the complexity of grid generation, the transparent structure contains a large number of tiny features, the requirement on grid quality is extremely high, secondly, the requirement on computational resources is large, the high-precision wave simulation needs a large amount of computation time and storage space, and furthermore, the existing research focuses on the influence analysis of a single parameter, and lacks systematic research on the synergistic effect of multiple parameters, which severely limits the optimal design of the transparent breakwater. Therefore, an efficient and accurate numerical simulation method is needed, and the wave characteristics of the transparent breakwater are systematically researched, so that reliable basis is provided for engineering design. Disclosure of Invention The invention provides a wave characteristic numerical simulation method and system of a transparent breakwater structure, which are used for solving the problems of high physical experiment cost, insufficient numerical simulation precision and no system for multi-parameter influence analysis in the prior art. According to the invention, by establishing a complete numerical simulation frame, accurate prediction and system analysis of wave characteristics of the transparent breakwater are realized, and reliable technical support is provided for engineering design. The method comprises the following steps of firstly, establishing a numerical model of a transparent breakwater structure, including pile foundation arrangement modes, geometric shapes and sizes o