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| 1 | A Comparison of Conventional and Shear-Rate Dependent Mohr-Coulomb Models for Simulating Landslides显示文摘Landslides may cause many fatalities and heavy economic losses,so it is vital to understand their mechanics so as to take appropriate measures to mitigate their risk.Phenomenally,the loose soil behaves like frictional material in most circumstances,so Mohr-Coulomb type equations are often used to describe their movement.However,these models generally do not consider the influence of the shearrate on the Mohr-Coulomb friction angle,so the shear-rate dependence effect on the soil flow and landslide runout is not well understood.This paper reports on an application of the incompressible Smoothed Particle Hydrodynamics(SPH) method to the dynamics of dry granular assemblies.The traditional model with a constant friction angle is compared with the modified Mohr-Coulomb model with a variable friction angle related to the shear-rate.It is found that the shear-rate dependence effect is negligible for shallow granular flows along mild slopes.With steeper slopes of the ground and larger aspect ratios of the initial soil column,the rate-dependence effect becomes more important. | LIANG Dong-fang HE Xu-zhen | 2014 | Journal of Mountain Science2014，11，6： | 3 |
| 2 | Comparative Study of Different SPH Schemes on Simulating Violent Water Wave Impact Flows显示文摘Free surface flows are of significant interest in Computational Fluid Dynamics(CFD). However, violent water wave impact simulation especially when free surface breaks or impacts on solid wall can be a big challenge for many CFD techniques. Smoothed Particle Hydrodynamics(SPH) has been reported as a robust and reliable method for simulating violent free surface flows. Weakly compressible SPH(WCSPH) uses an equation of state with a large sound speed, and the results of the WCSPH can induce a noisy pressure field and spurious oscillation of pressure in time history for wave impact problem simulation. As a remedy, the truly incompressible SPH(ISPH) technique was introduced, which uses a pressure Poisson equation to calculate the pressure. Although the pressure distribution in the whole field obtained by ISPH is smooth, the stability of the techniques is still an open discussion. In this paper, a new free surface identification scheme and solid boundary handling method are introduced to improve the accuracy of ISPH. This modified ISPH is used to study dam breaking flow and violent tank sloshing flows. On the comparative study of WCSPH and ISPH, the accuracy and efficiency are assessed and the results are compared with the experimental data. | 郑兴 马庆位 段文洋 | 2014 | China Ocean Engineering2014，28，6： | 1 |
| 3 | 用MPS方法数值分析孤立波与平板相互作用问题显示文摘表面孤立波与海洋结构物的相互作用常伴随有砰击、上浪等现象,是船舶与海洋工程领域需要研究的重要问题之一。该文采用基于无网格半隐式移动粒子MPS法开发的MLParticle-SJTU求解器,对孤立波与平板结构相互作用问题进行数值计算分析研究。模拟了二维孤立波对平板的冲击作用过程,得到的平板受力与实验结果吻合良好,验证了MLParticle-SJTU求解器在处理此类问题上的可行性。通过对孤立波与平板相互作用过程的三维模拟,观察到了有别于二维空间下的波浪在平板上表面演化过程,即呈现U型演化过程,说明对此类问题进行三维数值模拟的必要性。 | 张友林 唐振远 万德成 | 2016 | 水动力学研究与进展(A辑)2016，31，4： | 1 |
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