WIND ANALYSIS OF SHAPE CONFIGURED HIGH RISE STRUCTURES USING CFD

Abstract

This study focuses on the application of computational fluid dynamics (CFD) for wind analysis, specifically comparing it with conventional wind tunnel experiments. The research investigates the wind response of square and corner cut-shaped building models, particularly examining how wind incidence angle variations affect their optimization. Rigorous experiments were conducted on scaled 1:100 models in a virtual boundary layer wind tunnel. The numerical analysis employed the standard k-ε turbulence model to assess force coefficients, base moments, external surface pressure coefficients, and flow field characteristics of the models under different wind angles of incidence. By comparing the results of the experimental and CFD analyses, it was determined that the computational approach is a viable and accurate method for efficiently analysing wind behaviour in tall structures. The current project focuses on studying the response of a tall building with a 'plus' plan shape, standing at a height of 60m, when subjected to wind loads. The experiment was simulated using ANSYS CFD 2022 R1 in a virtual boundary layer wind tunnel. The simulation results were compared with experimental data and international standards to validate the findings. The numerical analysis employed the k-ε turbulence model to simulate the flow characteristics. The investigations were conducted based on the boundary layer flow in terrain category II, as defined in IS: 875 (Part 3) – 2015, with a mean wind speed of 10m/s. The pressure coefficients on various surfaces of the model were evaluated for wind incidence angles ranging from 0º to 180º. The results obtained from the numerical methods exhibited good agreement with the other approaches used, further demonstrating the accuracy and reliability of the numerical analysis for wind analysis in tall structures.