Assessment of Dynamic Behavior of Solid Cylinders in Different Configurations under Vortex-Induced Vibrations

Abstract

The study of fluid flow around cylindrical structures presents significant challenges due to the generation of drag, lift forces, and vortex-induced vibrations (VIV), which can impact structural stability and energy harvesting applications. This research evaluates the dynamic response of solid cylinders in various configurations under VIV using computational fluid dynamics (CFD). Simulations were conducted using ANSYS Fluent with a 10 m/s inlet airflow surrounding five turbine base-like columns. A structured mesh with 63,699 independent cells ensured numerical accuracy, maintaining a mesh quality of approximately 0.8. Mass conservation reports confirm third-order accuracy, validating the computational model. The velocity vector analysis highlights flow deflection around obstacles, with localized velocity spikes reaching 22.4 m/s, in agreement with Bernoulli’s principle. Contour plots of static and dynamic pressure demonstrate pressure fluctuations upon obstacle interaction, leading to vortex shedding and oscillatory forces. These fluctuations range between 48.9 and 3.98 kPa, significantly influencing the structural response. Findings indicate that VIV-induced oscillations vary with cylinder arrangement, affecting stability and fatigue life. Understanding these interactions is crucial for optimizing offshore wind turbine foundations, marine risers, and energy harvesting devices. The study contributes to the efficient design of offshore structures, reducing fatigue damage and enhancing resilience against fluid-induced vibrations.