Bridge pier scour is a significant issue in hydraulic engineering, as it has direct implications on the stability and lifespan of bridge foundations. This research investigates the process of scour around a circular pier in an open rectangular channel using a synergy between experimental observations and high-level numerical modelling. The research creates a high-fidelity Computational Fluid Dynamics (CFD) model using ANSYS Fluent to simulate the dynamics of flow, sediment transport, and the progressive formation of scour. To truly represent the intricate interactions between water flow and sediment transport, the research utilizes the k-ε and k-ω turbulence models, which are renowned for their strength in modelling turbulent flows. The Eulerian multiphase model, combined with the Volume of Fluid (VOF) sub-model, also accurately traces the moving water-sediment interface. The numerical simulations give important insights into influential flow phenomena like flow separation, patterns of turbulence, and wake development behind the pier—factors largely impacting the progression of scour. Through the examination of velocity distributions, turbulence properties, and bed shear stress, the research calculates a bed shear stress magnitude of 0.0269 N/m2, with a calculated scour depth of 0.06 m, in close agreement with empirical estimates for sandy materials under comparable flow conditions. The model is further confirmed to be accurate through residual analysis and convergence tests. This study's conclusions are significant to the field of engineering, especially with regards to avoiding hazards from scour. This research helps us understand how sediments behave under piers, laying the groundwork for building stronger hydraulic structures and improving scour prediction and prevention.