Wind Load Effects on Tall Structures Using Computational Fluid Dynamics

Abstract

Tall structures such as skyscrapers, transmission towers, and high-rise buildings are highly vulnerable to wind-induced forces, which significantly influence their structural stability, serviceability, and overall safety. Accurate assessment of wind load effects is essential for efficient structural design, particularly in regions exposed to high wind speeds and turbulent atmospheric conditions. This study investigates the wind load effects on tall structures using Computational Fluid Dynamics (CFD) to analyze airflow behavior, pressure distribution, and resulting structural responses. The methodology involves the development of a three-dimensional numerical model of a tall structure subjected to varying wind velocities and flow conditions. The governing Navier–Stokes equations are solved using turbulence models such as k-ε and Large Eddy Simulation (LES) to capture complex flow characteristics around the structure. Wind pressure coefficients, velocity profiles, and vortex shedding effects are analyzed to understand aerodynamic behavior. The simulation results are validated using available wind tunnel experimental data for accuracy assessment. The findings indicate that wind pressure distribution is highly non-uniform, with maximum stress concentrations occurring at the windward face and building corners due to flow separation and vortex formation. Increasing building height and slenderness ratio leads to enhanced dynamic responses and amplified oscillations. It is also observed that structural shape significantly influences wind flow patterns, where aerodynamic modifications can reduce wind-induced forces effectively.