基于OpenFOAM的桩基透空堤结构尺度其透射系数的影响

Influence on transmission coefficient of pile-foundation penetrated breakwater structural scale based on OpenFOAM

为探讨透空堤相对堤宽和挡板相对入水深度在工程中的合理取值范围,本文采用某交通码头改扩建工程物理模型试验与开源软件OpenFOAM数值模拟,进行了透空式防波堤相对堤宽和挡板相对入水深度对透射系数的影响研究,并分析了透空堤流场变化机理。结果表明:随着相对堤宽(B/L,B为堤宽,L为波长)增大,透空堤透射系数减小,当相对堤宽比大于0.35L后透射系数趋于稳定;随着挡板入水深度(Δ)增加,透射系数减小,当挡板相对入水深度(Δ/H,H为透射波高)大于1.0H时,透射系数趋于稳定;透空堤流场图显示,随着相对堤宽的增大,波浪发生紊乱,震荡空间变大使得波浪耗散增加,随着挡板入水深度增大,波浪与结构物作用面积增大使得波浪耗散增加。研究表明,结合港口现行规范,在实际工程中相对堤宽适宜范围应为0.25~0.35L,挡板相对入水深度适宜范围应大于1.0H。

To explore nearby dam embankment width,and the relative water depth of a relative baffle in the reasonable scope of the project,the effects of openwork breakwater relative dike of wave plate width,and relative water depth on the transmission coefficient were investigated by a traffic terminal projects of physical model test and open source software OpenFOAM numerical simulation,and the mechanism of the flow field changes was analyzed.It was found that the transmission coefficient was decreases with the increase in the relative dike width(B/L=dike width/dike length),and tends to be stable when the relative dike width ratio was greater than 0.35L.The transmission coefficient was shown to be decreased with the increase in the water depth of the baffle,and tended to be stable when the relative water depth of the baffle(Δ/H,H is the height of incident wave)was greater than 1.0H.The observation of the flow field diagram revealed that the waves were in disorder and the space becames more with the increase in the width relative to the dike,resulting in the increase in wave dissipation.The interaction area between waves and structures was increased with the increase in the water depth of the baffle,resulting in the increase in wave dissipation.The finding indicates that in combination with the current port code,the appropriate range of relative dike width is 0.25-0.35L,and that the appropriate range of relative water entry depth of baffle is greater than 1.0H in actual engineering.