Author(s): Truc Tran; Chu Chia-Ren

Linked Author(s):

Keywords: Narrow Channel; Blockage Ratios; Hydrodynamics Loading; Vorticity Distribution

Abstract: This study investigates the effect of blockage ratios on vorticity distribution and hydrodynamic forces around a circular cylinder in a narrow channel using a three-dimensional numerical model that combines Large Eddy Simulation (LES) with the Volume of Fluid (VOF) method. The simulation, conducted with Truchas software, explores blockage ratios ranging from 10% to 25%, analyzing drag coefficients, Strouhal numbers, and vorticity distribution. Model validation against experimental results confirms the accuracy of the LES model, demonstrating strong agreement in drag and Strouhal number measurements. The findings reveal that higher blockage ratios significantly intensify vortical flows and turbulence, potentially increasing structural loading on cylindrical structures in confined environments. The vorticity distributions exhibit more robust and expansive vortex structures at higher blockage ratios, indicating increased turbulence, which may cause erosion around the piers of the bridge and along both sides of the channel.

DOI: https://doi.org/10.64697/978-90-835589-7-4_41WC-P1653-cd

Year: 2025