报告题目：The simulation of debris flows as a multiphase medium and their impact on barriers

报告时间：6月16日（周五） 14:00-15:00

报告地点：舟山校区海工楼413会议室

报告人简介：Alessandro Leonardi ，2012年在意大利帕多瓦大学获得土木工程学士和硕士学位，2015年在苏黎世联邦理工学院获得博士学位。已在国际国内重要学术期刊上发表多篇论文，包括 Physical Review E，Computational Particle Mechanics，Computer-Aided Civil and Infrastructure Engineering等期刊，并且与其他作者合作出版了书籍“Lattice-Boltzmann Method for Geophysical Plastic Flows”。曾多次在EGU，IAHR，International Ocean and Polar Engineering Conference等会议上做口头报告。

研究领域：Geophysical flows Sediment transport, Coupled problems in geomechanics, Numerical modeling of granular materials, Lattice-Boltzmann method Discrete element method 

代表论著：

1.  M. Marchelli, A. Leonardi, M. Pirulli. “Efficiency of open barriers on the retention of

dry granular flows: a numerical study”, in preparation, 2017.

2. A. Leonardi, F. Zanello, F. Roman, D. Pokrajac, L. Falcomer, V. Armenio. “Turbulence

exchange at the interface between free flow and a permeable bed”, in preparation,

2017.

3. F. Kyrousi, A. Leonardi, C. Juez, J. Zordan, F. Zanello, L. Falcomer, F. Roman, V. Armenio,

M.J. Franca. “Investigation of entrainment capacity of a lock-exchange gravity current”,

submitted to Journal of Geophysical Research: Oceans, 2017.

4. A. Leonardi, F. K. Wittel, M. Mendoza, R. Vetter, and H. J. Herrmann, “Particle-fluidstructure

interaction for debris flow impact on flexible barriers”, Computer-Aided Civil

and Infrastructure Engineering, vol. 31 (5), pp. 323–333, 2016.

5. A. Leonardi, M. Cabrera, F. K. Wittel, R. Kaitna, M. Mendoza, W. Wu, and H. J. Herrmann,

“Granular front formation in free-surface flow of concentrated suspensions,” Physical

Review E, vol. 92, 052204, 2015.

6. A. Leonardi, F. K. Wittel, M. Mendoza, and H. J. Herrmann, “Lattice-Boltzmann Method

for Geophysical Plastic Flows”, in Recent Advances in Modeling Landslides and Debris Flows

(W. Wu, ed.), pp. 131–140, Springer International Publishing Switzerland, 2014.

本次报告摘要：Debris flow are composed of a liquid fraction mixed with poorly sorted sediments. This makes their behavior difficult to predict and numerically reproduce, which in turn hampers the rational design of mitigation structures. In this seminar, a numerical model is presented, where the multiphase nature is explicitly taken into account by coupling two solvers. The liquid phase is modelled using the Lattice-Boltzmann Method, which also contains a non-Newtonian formulation to address the presence of fine dispersed sediments in the fluid. The large sediments are instead explicitly represented as a collection of Lagrangian particles using the Discrete Element Method. By tuning the rheological parameters of the liquid, one can obtain a realistic description of the material. The model is fully three-dimensional and can be therefore used to simulate the impact on retention structures. Specifically, the problem of interaction with a steel net is investigated, where the capability of the structure to filter the coarser portion of the sediments needs to be correctly reproduced.

欢迎各位老师和同学参加！