Author(s): Nima Ikani; Jaan H. Pu
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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. The principal aim was to analyse the three-dimensional flow velocity and vortices behaviour around a configuration of three-square bridge piers arranged in tandem in clear water in smooth bed to unerestand how this complex model can be similar to the real-nature flow behavior. The simulation utilized the k-ɛ method, implemented through Ansys Fluent 21 software, to model the free surfaces. The obtained results were subsequently analysed to determine the vortices’ distribution around the piers, based on the velocity distribution at the two different depths (z/h=0.15, and 0.62). The accuracy of the proposed CFD model has been validated through the experimental analysis using Acoustic Doppler Velocimeter (ADV) measurements, demonstrating the model’s ability to reproduce key aspects of velocity distribution across undisturbed and recovery regions (Pu et al., 2014). As part of the validation process, simulation results were compared with data derived from laboratory experiments, including flow channel dynamics and pier configurations. Furthermore, the study examined the impact of the piers on flow characteristics by analysing flow patterns and extracting relevant distributions and can provide effective strategies for controlling scouring and minimizing destructive vortex effects.
Year: 2024