ABSTRACT

In this study, the wave energy dissipation over a horizontal slotted plate with a leeside vertical seawall was extensively investigated by analytical and numerical approaches. The analytical model was developed by using the matched eigenfunction expansion method and the energy dissipation model with a porosity-dependent drag coefficient estimated by computational fluid dynamics (CFD) results from the 2D channel flow with symmetric slats. The energy dissipation of a horizontal slotted plate was assessed by analyzing the variation of the reflection coefficient, wave run-up, vertical wave force on the plate, and horizontal wave force on the vertical wall for different submergence depths, porosities, plate lengths, and wave steepnesses. Results from the analytical model were compared extensively with those from CFD simulations. CFD computations were performed by using an incompressible turbulence model based on Reynolds averaged Navier–Stokes equations and volume of fluid method. Overall, a good agreement was observed between the analytical and CFD results. A qualitative numerical analysis showed that the wave dissipation over a horizontal slotted plate was caused by the generation of higher-harmonic waves, wave breaking, and vortices formation near the slotted plate. The presented analytical and numerical models would provide a mutually complementary tool for the accurate and efficient design of a horizontal slotted plate for reducing the reflection coefficients, wave forces, and wave run-up on seawalls.

抽象的

在这项研究中，通过分析和数值方法广泛研究了具有背风侧垂直海堤的水平缝隙板的波浪能量耗散。通过使用匹配的特征函数展开法和能量耗散模型，建立了解析模型，该模型的耗散模型是由具有对称板条的二维通道流通过计算流体力学（CFD）估算的孔隙率相关的阻力系数。通过分析不同浸没深度，孔隙率，板长和板长的反射系数，波上升，板上的垂直波力和垂直壁上的水平波力的变化，评估了水平开槽板的能量耗散。波陡度。分析模型的结果与CFD模拟的结果进行了广泛的比较。通过使用基于雷诺平均Navier-Stokes方程和流体体积法的不可压缩湍流模型进行CFD计算。总体而言，在分析结果和CFD结果之间观察到良好的一致性。定性的数值分析表明，水平缝隙板的波耗散是由在缝隙板附近产生高次谐波波，断波和形成涡流引起的。提出的分析模型和数值模型将为水平缝板的精确和高效设计提供相互补充的工具，以减少反射系数，波浪力和海堤上的波浪上升。在分析结果和CFD结果之间观察到了很好的一致性。定性的数值分析表明，水平缝隙板的波耗散是由在缝隙板附近产生高次谐波波，断波和形成涡流引起的。提出的分析模型和数值模型将为水平缝板的精确和高效设计提供相互补充的工具，以减少反射系数，波浪力和海堤上的波浪上升。在分析结果和CFD结果之间观察到很好的一致性。定性数值分析表明，水平开缝板上的波消散是由高谐波波的产生，波的破裂以及在开缝板上附近形成涡流引起的。提出的分析模型和数值模型将为水平缝板的精确和高效设计提供相互补充的工具，以减少反射系数，波浪力和海堤上的波浪上升。