Abstract
A numerical investigation is performed on the flow-induced vibrations (FIVs) of two coupled cylinders with various cross-sections and their performance on power scavenging. The shear stress transport (SST) k - ω turbulence model is employed to study the turbulent conditions. The center distance ratio (l*) values of cylinders are divided into four cases (1.5D, 2D, 2.5D, and 3D) for comparative analysis. The results demonstrate that the reduced velocity and Reynolds number play key roles in the wake motion and dynamic responses of the coupled system. It has also been proven that the square-based cylinder system exhibits galloping without the presence of any vortex-induced vibration through four benchmarks of computational fluid-structure interaction (FSI) models. Considering the coupled square and circular cylinder system, the results indicate that depending on the distance between the two connected cylinders, the Reynolds number and the reduced velocity have a significant influence on the dynamics and efficiency of the system. Additionally, galloping dominants for all considered distances between the square and circular cylinders.
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