两相光滑粒子流体动力学方法在动床溃坝问题中的应用

发布时间：2018-06-16 18:31

  本文选题：光滑粒子流体动力学 + 动床　； 参考：《中国科学院大学学报》2017年05期

【摘要】：光滑粒子流体动力学(SPH)方法采用离散分布的粒子作为离散工具,借助粒子和核函数将场变量及其导数以某种加权求和的方式进行计算,使得该方法更适于处理包含大位移、动边界和自由表面的问题。本文在分析动床条件下的溃坝问题时,以Drunker-Prager准则作为底床颗粒物的侵蚀启动判断条件。满足该条件而发生启动的颗粒物将以非牛顿流体的特征发生运动,即以Herschel-Bulkley-Papanastasiou模型来描述;否则,认为底床颗粒物未启动而保持静止状态。为进一步改进计算结果,采用基于体积比的两相SPH方法描述固液混合体的动力学特征,并基于固液混合颗粒流的动力学特征对混合黏度的计算进行改进。基于上述原理,分析动床条件下的溃坝问题,并将数值计算结果与已有的实验数据进行对比,证明本文提出的混合黏度计算公式改进了数值计算结果。
[Abstract]:The smooth particle hydrodynamics (SPH) method uses discrete particles as a discrete tool and computes field variables and their derivatives in a weighted summation way by means of particles and kernel functions, which makes the method more suitable for dealing with large displacements. The problem of moving boundary and free surface. In this paper, the Drunker-Prager criterion is used as the criterion for judging the erosion start of particulate matter in the bottom bed when analyzing the dam-break problem under moving bed conditions. The particles that meet this condition will move in the form of non-Newtonian fluid, that is, the Herschel-Bulkley-Papanastasiou model, otherwise, it is considered that the particles in the bottom bed remain at rest without starting. In order to further improve the calculation results, the two-phase SPH method based on volume ratio is used to describe the dynamic characteristics of solid-liquid mixture, and the calculation of mixing viscosity is improved based on the kinetic characteristics of solid-liquid mixed particle flow. Based on the above principle, the dam-break problem under moving bed condition is analyzed, and the numerical results are compared with the existing experimental data. It is proved that the mixed viscosity calculation formula proposed in this paper improves the numerical results.
【作者单位】： 中国科学院水利部成都山地灾害与环境研究所中国科学院山地灾害与地表过程重点实验室;中国科学院大学;安徽理工大学土木建筑学院;
【基金】：国家自然科学基金(41372331,41672318) 中国科学院西部之光人才培养计划在职博士研究生资助项目资助
【分类号】：O35
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本文编号：2027706