Aerodynamic Effects on V plan Shaped Tall Buildings

Abstract

This study investigates the behaviour of V plan shaped buildings under wind from various directions using CFD and wind tunnel experiments. CFD simulations were conducted in ANSYS CFX with RANS equations and grid independence tests for accuracy. Wind incidence angles ranged from 0° to 180°, and wind tunnel tests at IIEST Shibpur validated CFD results. Side ratio effects were studied by varying it from 1.5 to 5, maintaining constant plan area and height, to analyze pressure and force coefficients and flow patterns. Further, Single Tuned Mass Damper (STMD) and Multiple Tuned Mass Damper (MTMD) were examined for vibration control considering different mass and tuning ratios. MTMDs proved more effective than STMDs in reducing displacement, acceleration, base shear, moment, and torsion. The role of MTMD with varying internal limb angles (40° 150°) was analyzed, and polynomial expressions were proposed to compute force and moment coefficients efficiently. Dynamic analysis showed significant reduction in responses using MTMD. Additionally, aerodynamic modifications like corner chamfering and rounding were studied, showing that corner modification reduces force and displacement while MTMD drastically reduces acceleration, suggesting their combined use enhances performance. To further improve MTMD efficiency, optimum locations were identified using ANN, Response Surface Methodology, and Multi-Objective Grey Wolf Optimization (MOGWO). Latin Hypercube Sampling (LHS) minimized simulation numbers, and regression models were developed for displacement and acceleration reduction efficiencies. Results indicated strategic placement of MTMDs maximizes reduction of along and across wind responses. Overall, combining aerodynamic modifications with optimally located MTMDs effectively mitigates wind-induced vibration in V plan-shaped tall buildings. newline