基于SPH 方法的开口沉箱水动力数值研究

部分开口沉箱因其能有效降低波浪力和反射系数被广泛的应用到港口工程领域, 基于修正后的光滑粒子流体 动力学( SPH ) 算法建立了二维数值波浪水槽与开口沉箱数值模型, 并与现有的线性规则波理论进行对比, 验证了 SPH 数值方法的正确性, 同时还对开孔沉箱消浪室内部流体流入流出的复杂运动过程性、总水平力比与其相关因 素的关系进行了深入分析, 并将数值结果与物理模型实验进行对比, 结果表明, 数值结果与实验拟合的线性关系相 一致; 当消浪室相对宽度B/ L 为0. 11 时, 开孔沉箱总水平力减小趋势很明显。最后, 采用了最小二乘法拟合出开 孔沉箱总水平力与其相关因素的非线性回归关系。本研究将为类似工况下开口式沉箱的设计和优化提供一个新的 参考依据。 The perfo rated caisso n can effect ively decrease the w ave fo rce and r eflectio n co eff icient , thus it is w idely used in po rt eng ineering. In this paper, the mo dified Smo othed Particle H ydrodynamics ( SPH) alg or ithm w as used to dev elop a tw o2dimen2 sio nal numerical model of wav e and perfor ated caisson. Compared w ith the results determ ined by the ex isting linear regular wav e theo ry , the numer ical r esults o btained from the SPH method w ere prov ed to be co rrect. Meanw hile, the complex characterist ics of int ernal fluid mo tion in and out o f the wav e dissipat ion chamber , and the r elationship betw een the to tal horizo ntal fo rce and its affecting factor s wer e inv estigated. The numer ical results wer e compar ed with the experimental results, w hich indicated that the numerical calculation of the ratio of to tal ho rizontal force is in go od agr eement w ith t he empir ical reg ression equation obtained from t he ex per imental data, and t he to tal hor izontal fo rce of the per forated caisson t ends to decrease when the r elative w idth of wav e dissipatio n chamber is about 0. 11. Fina lly, t he least squar es method w as used to der ive a nonlinear reg ression equation to represent the r elatio nship bet ween the to tal ho rizontal force and its affecting factor s. The r esear ch can pro vide a new reference for t he design and o ptimization of perfo rated caisso n under the simila r w orking co ndit ions. 国家自然科学基金项目/ 波浪作用下斜坡堤护面块体失移和破坏过程的精细模拟0 ( 51179030)