A method for hydrodynamic analysis of perforated breakwaters

Abstract

The invention relates to a hydrodynamic analysis method for a perforated breakwater. The hydrodynamic analysis method comprises the following steps: S1, establishing a drainage basin model in a two-dimensional plane; S2, establishing a numerical model on the basis of a potential flow theory and a dual boundary element method, and adopting a secondary pressure loss boundary condition at the boundary of the perforated plate; and S3, discretizing the boundary of the calculation area and the boundary integral equation, establishing a nonlinear equation set, and obtaining a reflection coefficient CR and a transmission coefficient CT of the breakwater through iterative calculation. According to the hydrodynamic analysis method for a perforated breakwater, secondary pressure loss boundary conditions are applied, the influence of wave height on wave energy dissipation can be directly considered in the analysis process, and a calculation analysis result and a physical model test result are in good conformity. The method has good applicability to the boundary of the degraded perforated thin plate, and the complexity of the problem is reduced. The method is high in calculation speed, the complex shape of the perforated breakwater can be considered, the most unfavorable working condition analysis can be carried out, and an important reference basis is provided for the engineering design ofthe perforated breakwater.

Description

technical field [0001] The invention relates to the field of hydrodynamic analysis, in particular to a hydrodynamic analysis method for an open breakwater. Background technique [0002] The research on open breakwaters is generally divided into theoretical analysis, numerical simulation and model test methods. The theoretical analysis is based on the potential flow theory, using the matching characteristic function expansion method (Liu et al., 2016) or the multipole expansion method (Liuand Li, 2012), etc., to analyze the hydrodynamic characteristics of the breakwater with openings in the frequency domain. Scientific understanding of what goes wrong, but theoretical approaches are not suitable for open breakwaters of complex shape. Numerical simulation generally solves the Navier-Stokes equations to establish a solution model in the time domain (Takahashi et al., 2003; Lara, 2005; Ren and Ma, 2015), which can finely simulate the flow field changes around the open structure...

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Problems solved by technology

The theoretical analysis is based on the potential flow theory, using the matching characteristic function expansion method (Liu et al., 2016) or the multipole expansion method (Liuand Li, 2012), etc., to analyze the hydrodynamic characteristics of the breakwater with openings in the frequency domain. Scientific understanding of what goes wrong, but theoretical approaches are ill-suited for complex-shaped open-cell breakwaters

Numerical simulation generally solves the Navier-Stokes equations to establish a solution model in the time domain (Takahashi et al., 2003; Lara, 2005; Ren and Ma, 2015), which can finely simulate the flow field changes around the open structure However, the calculation efficiency of the time-domain method is poor, and the hardware requirements such as computers are relatively high.

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