波浪与多孔结构流固耦合过程的SPH模拟研究  

Numerical modeling of wave-porous structure interaction process with an SPH model

作　　者：冯殿垒 NEUWEILER Insa 黄雨[3] FENG Dianlei;NEUWEILER Insa;HUANG Yu(Department of Hydraulic Enginering,Tongji University,Shanghai 200092.China;Institute of Fluid Mechanics and Environmental Physics in Civil Engineering,Leibniz University Hannover,Hannover 30167,Germany;Department of Geotechnical Enginering,Tongji University,Shanghai 200092,China)

机构地区：[1]同济大学土木工程学院水利工程系,上海200092 [2]德国汉诺威莱布尼茨大学土木工程学院流体与环境物理研究所,德国汉诺威30167 [3]同济大学土木工程学院地下建筑与工程系,上海200092

出　　处：《中国科学：物理学、力学、天文学》2022年第10期170-179,共10页Scientia Sinica Physica,Mechanica & Astronomica

基　　金：中央高校基本科研业务费专项资金;德国科学基金(编号:FE 1962/1-1)资助项目。

摘　　要：本文针对波浪与高渗透率多孔结构相互作用问题建立了考虑固、液两相材料的光滑粒子动力学(SPH)模型.模型中采用流、固两种SPH粒子进行数值离散,继而能够直接应用于非均匀孔隙率分布问题的研究.为保证拉格朗日粒子在不同孔隙率区域内求解精度的一致性,模型中对流体粒子计算采用了变光滑长度模型.同时,为获得稳定的数值结果,数值模型中考虑了δ-SPH人工耗散项.为描述多孔介质内高雷诺数流动过程,本研究采用非线性Forchheimer方程对流体动量方程进行了修正,数值模拟结果能准确重现实验观测水位演化、分布数据.基于该模型,本文进一步对非均匀分布孔隙率工况进行了研究,并与均匀孔隙率工况进行对比.结果表明本文提出的模型能够有效描述孔隙率变化对波浪消减过程的影响,并能定量描述相应流场演变过程.This paper presents a smoothed particle hydrodynamics(SPH)model for modeling the fluid-structure interaction of waves and porous structures with high permeability.In the proposed model,the solid and fluid phases are discretized with two types of SPH particles;thus,the model can be applied to study heterogeneous problems directly.We use a varying smoothing length model to preserve the numerical accuracy inside and outside the porous media.The SPH artificial numerical viscosity mode is used in this study to achieve stable numerical solutions.Furthermore,the wellknown Forchheimer model has also been used to model the flow in porous media with high Reynolds numbers.With the current model,the experimental observation of the water-level evolutions of a wave-dam interaction benchmark problem has been reproduced.We have also investigated a scenario with a heterogeneous distribution of porosities and compared the simulation results to those of the benchmark problem.Consequently,our model can determine how porous structures can reduce the kinetic energy induced by the waves around the coast.

关 键 词：δ-SPH 非均匀多孔结构 流固耦合 波浪 

分 类 号：P75[天文地球—海洋科学] O353.4[理学—流体力学]