Title: CFD validation of wind pressure distribution on a tall building under the influence of upstream terrain

Authors: K.B. Rajasekarababu; G. Vinayagamurthy

Addresses: Aerodynamics Laboratory, School of Mechanical Engineering (SMEC), Vellore Institute of Technology, Chennai, Vandalur – Kelambakkam Road, Chennai – 600127, Tamil Nadu, India ' Aerodynamics Laboratory, School of Mechanical Engineering (SMEC), Vellore Institute of Technology, Chennai, Vandalur – Kelambakkam Road, Chennai – 600127, Tamil Nadu, India

Abstract: It is essential to investigate the pressure distribution, aerodynamic coefficients and wind flow fields in-order to predict the wind loads and wind behaviour in building environments. Most of the investigations and international wind load standards haven't highlighted the wind load and wind environment on-and-around buildings under different terrains. The main objective of this investigation is to explore a practical numerical approach for the accurate estimation of wind loads and their impact on buildings under different upstream conditions. In this investigation, simulations are done in IDDES turbulence model along with the formulation of k-ω SST using CFD. Results indicated the influence of ground roughness in pressure distribution on building faces. Furthermore, CFD results over-predicted the experimental values near the edges due to strong shear-flow and expanding wake-vortices. The cross-validation of the mean drag coefficients showed good-agreement. Hence this investigation promotes the practice of IDDES in wind-resistant designs for tall buildings.

Keywords: wind pressure distribution; upstream terrain; open and suburban winds; wake recirculation length; aerodynamic coefficients; rectangle building; improved detached eddy simulation; computational fluid dynamics; CFD.

DOI: 10.1504/PCFD.2020.109905

Progress in Computational Fluid Dynamics, An International Journal, 2020 Vol.20 No.5, pp.284 - 298

Received: 29 Jun 2019
Accepted: 18 Jan 2020

Published online: 02 Sep 2020 *

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