In this mini-symposium, we invite world-leading researchers to present and discuss recent advances in the numerical modelling of granular and multi-phase flows. The focus will encompass a broad spectrum of numerical techniques, including but not limited to the Discrete Element Method (DEM), Smoothed Particle Hydrodynamics (SPH), Moving Particle Simulation (MPS), Volume-of-Fluid (VOF), and the Lattice Boltzmann Method (LBM). We also encourage contributions that integrate data-driven approaches, such as surrogate modelling, reduced-order modelling, and machine learning frameworks, to enhance, accelerate, or augment these numerical simulations. The symposium aims to foster interdisciplinary discussions that bridge fundamental modelling, computational techniques, and applications across science and engineering, thereby highlighting both methodological innovations and practical impacts.