基于SPH方法的明基床开孔沉箱数值模拟研究  

Numerical study of perforated caisson sitting on rubble mound foundation based on SPH method

作　　者：任喜峰[1] 孙昭晨[1] 梁书秀[1] REN Xi-feng;SUN Zhao-chen;LIANG Shu-xiu(State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学海岸及近海工程国家重点实验室,大连116024

出　　处：《水道港口》2018年第4期410-415,共6页Journal of Waterway and Harbor

基　　金：国家重点研发计划(2016YFC1401405);国家自然科学基金(51779038);海洋公益性行业科研专项(201405025-1)

摘　　要：基于光滑粒子流体动力学(SPH)方法,结合域着色(CDP)技术,建立了二维数值水槽。利用数值水槽对典型工况下规则波与明基床上开孔沉箱的相互作用进行数值模拟。对比分析文章CDP-SPH方法与VOF方法计算结果以及实验数据,结果显示文章模型与实验值更加吻合,表明SPH方法在解决大变形自由面问题上具有一定优势。随后,将数值水槽用于模拟多种工况下波浪与明基床开孔沉箱的相互作用,分析了相对基床高度和相对消浪室宽度对明基床上开孔沉箱反射系数的影响。最后,将计算得到的反射系数与实验所得经验公式进行比较,数值模拟结果与实验结果吻合良好。文章采用改进的CDP-SPH方法,大大降低了SPH方法用于计算开孔沉箱的计算量,为开孔沉箱的数值模拟提供了新的手段。Based on the smooth particle hydrodynamics （SPH） method, a 2D numerical flume was developed. The coloring domain particle （CDP） method was applied to enforce the present SPH model. A ease of regular wave-perforated caisson sitting on rubble mound foundation was carried out. By comparing the results of present SPH model, VOF model and the experimental ones of various pressure sensors, the present SPH model is more accurate than VOF model. This also implies the highlight of the adaptability of SPH method to deal with the large deformation of free surface. Then, the impacts of the relative bed height and the relative width of the chamber on the reflection coefficient of the perforated caissons were studied by carrying muhiple test cases. Comparison of estimated results of present SPH model and the empirical formula obtained from the experimental data shows that the reflection coefficient from present SPH model agrees well with the experimental data. The improved CDP-SPH method decreases the computation cost remarkably for simulation of wave-perforated caissons with SPH method, and provides a new method for simulating the interaction between waves and perforated-caisson.

关 键 词：SPH CDP 薄壁结构 透空式沉箱 

分 类 号：TV139.2[水利工程—水力学及河流动力学]