Renmin Zhujiang (Jul 2024)
Improvement of Discrete Phase Model for Particles and Its Validation for Application in Numerical Simulation of Landslide Surges
Abstract
The evolution of landslide surge chain-generated hazards involves complex landslide-stream interactions, and the application of fluid-solid coupling methods at the granular scale is becoming more and more prominent. In order to study this problem in depth, this study adopts the CFD (Computational Fluid Dynamics)-DEM (Discrete Element Method) fluid-solid coupling method at the granular scale. The UDF is written to improve the disadvantage that the discrete phase model in the Computational Fluid Dynamics software FLUENT can only perform momentum exchange but cannot consider the drainage effect. This not only improves the volume replacement problem between landslides and fluids, but also overcomes the limitation of the critical size ratio of mesh particles. In the simulation of particle accumulation body collapse-surge test, the maximum surge height obtained by numerical simulation is 8.67 cm, which is more consistent with the physical test results, proving that the improved CFD-DEM fluid-solid coupling model proposed in this paper can effectively restore the particle motion state and the fluctuation change of the surge, and it can meet the needs of the coarse-grained material modeling of landslides in the simulation of the landslide surge process and the high-resolution real topography grid in the simulation of landslide surge process.
