NUMERICAL ANALYSIS STUDY OF DEBRIS FLOW BY USING HYDRO DEBRIS 2D MODEL (HD2DM)

This study presents a computational method smoothed particle hydrodynamics (SPH) to model debris flows containing mixed grain consist of two types (10mm and 2.5mm) particles. The two-dimensional numerical simulations are validated by comparing based on the experimental study of hydraulic physical model. This study was performed using particle tracking equations which is lagrangian equation. Numerical calculations were carried out at the waterways (flume inlet channel) which at two places (erodible bed (upstream) and near the bottom of flume channel (downstream)). The ratio of numerical model particle and actual particle mass is 1:1, but the physical shape of the particles are not similar. The numerical simulation frequency distribution results of the velocity shows fairly good agreement with the experimental results