Submarine landslide is one of the main marine geological disasters. Once submarine slide happens

it will cause serious damage to underwater infrastructures. However

there are few researches on the movement and evolution of submarine landslides

especially considering the viscous effect of submarine landslides. A fluid-structure coupling model describing the interaction between water and particles was established by using computational fluid dynamics (CFD) and discrete element method (DEM)

and a cohesive force model was introduced to develop a coupled CFD-DEM analysis method considering the viscous characteristics of sliding body. On this basis

the kinematic characteristics (velocity and distance) and morphological characteristics (length

width

shape

etc.) of the submarine landslide were systematically simulated by considering the viscosity and initial velocity of the landslide

and the influencing mechanism of the evolution process of the landslide movement was investigated in depth. The results show that the coupled method can simulate and reproduce the small-scale movement behavior of the submarine landslide well

the viscous action of the landslide has a remarkable influence on its kinematic and morphological characteristics

and the initial velocity also significantly affects the evolution and distribution characteristics of the particle flow field in each part of the landslide. The results can provide a scientific basis for the evolution process simulation and the effective prediction of submarine landslides.