Author(s): Nima Ikani; Jaan H. Pu
Linked Author(s):
Keywords: No Keywords
Abstract: In this study, the flow characteristics around a complex group-pier in open channel flow were investigated numerically using a second-order characteristic-based numerically approach. The principal aim was to analyse the three-dimensional flow velocity and vortices behaviour along a configuration of three-square bridge piers arranged in tandem in clear water conditions over a smooth bed. This investigation aimed to understand how this complex model can replicate real-world flow behaviours, revealing natural flow dynamics around bridges. The simulation utilized the k-ɛ model, implemented through Ansys Fluent 21 software, to accurately represent free surface flow dynamics. The obtained results were subsequently analysed to determine the vortices’ distribution along and around the piers, based on the velocity distribution at the two specific depths (z/h=0.15, and 0.62). The accuracy of the proposed CFD model was rigorously validated against the experimental data obtained using Acoustic Doppler Velocimeter (ADV) measurements. This validation demonstrated the model's capability to reproduce key aspects of velocity distribution across undisturbed and recovery regions (Pu et al., 2014). Additionally, the simulation results were compared with laboratory experimental data, including flow channel dynamics and pier configurations, to enhance confidence in the model's reliability. Furthermore, the study examined the impact of the piers on flow characteristics by analysing flow patterns and extracting relevant distributions. These findings contribute to the development of effective strategies for mitigating scouring and minimizing destructive vortex effects around bridge structures.
Year: 2024