Numerical simulation of submarine landslide tsunamis using particle based methods

• Published in: Journal of hydrodynamics. Series B Vol. 29; no. 4; pp. 542 - 551
• Main Author: 邱流潮 金峰 林鹏智 刘毅 韩宇
• Format: Journal Article
• Language: English
• Published: Singapore Elsevier Ltd 01.08.2017; Springer Singapore; College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China%State Key Laboratory of Hydroscience and Hydraulic Engineering, Tsinghua University, Beijing 100084, China%State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, China%State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, China
• Subjects: discrete element method; Engineering; Engineering Fluid Dynamics; fluid-solid interaction; free-surface flows; Hydrology/Water Resources; Landslide tsunamis; Numerical and Computational Physics; Simulation; smoothed particle hydrodynamics; SPH方法; 光滑粒子流体动力学; 数值模拟; 海啸; 海底滑坡; 粒子法; 运动边界问题; 连续介质力学; free-surface flows; smoothed particle hydrodynamics; Landslide tsunamis; fluid-solid interaction; discrete element method
• ISSN: 1001-6058; 1878-0342
• DOI: 10.1016/S1001-6058(16)60767-9

This paper presents the simulation of tsunamis due to rigid and deformable landslides with consideration of submerged conditions by using particle methods. The smoothed particle hydrodynamics (SPH), as a particle based method, is for solving problems of fast moving boundaries in the field of continuum mechanics. Other particle based methods, like the discrete element method (DEM), are suitable for modeling the displacement and the collision related to the rigid landslides. In the present work, we use the SPH and the DEM to simulate tsunamis generated by rigid and deformable landslides with consideration of submerged conditions. The viscous free-surface flows are solved by a weakly compressible SPH and the displacement and the rotation of the rigid body slides are calculated using a multi-sphere DEM allowing for modeling solids of arbitrarily complex shapes. The fluid-solid interactions are simulated by coupling the SPH and the DEM. A rheology model combining the Papanastasiou and the Herschel-Bulkley models is applied to represent the viscoplastic behavior of the non-Newtonian flow in the submarine deformable landslide cases. Submarine landslide tsunamis due to rigid and deformable landslides are both simulated as typical landslide cases in this investigation. Our simulated results and the previous experimental results in the literatures are in good agreement, which shows that the proposed particle based methods are capable of modeling the submarine landslide tsunamis.