DEM-SPH Coupling Method for Landslide Surge Based on a GPU Parallel Acceleration Technique

A high-performance DEM-SPH coupling method for landslide surge is proposed based on a graphics processing unit (GPU) parallel acceleration technique. A GPU-based simulation program, namely, G-DeSp, is developed using C++ and Compute Unified Device Architecture language, which can simulate 3D landslide surge with millions of particles precisely and efficiently. A two-phase flow dam-break test is adopted to validate the accuracy and efficiency of G-DeSp. Three-dimensional landslide surge simulations are conducted with the different diameter of solid particles and the maximum climb height of the surge by granular slide and rigid slide is analyzed. Results show that G-DeSp accurately simulates landslide surge, such as the movement and deformation of the landslide, the generation and propagation of surge waves, and the violent interaction of the fluid-solid. The velocity and displacement of the granular slides and surge decrease with the increase in the diameter of solid particles. The maximum climbing height of surge by the rigid slide is 6.5 times that of surge by the granular slide with the same volume, which indicates that the surge hazard induced by the rigid slide is much more serious than that induced by the granular slide.

Automated summary

A high-performance DEM-SPH coupling method based on GPU parallel acceleration technique is proposed for landslide surge simulation. The accuracy and efficiency of the method are validated through simulation experiments, and the effects of different particle diameters and surge climb heights on the simulation results are analyzed.