Effects of courtyard and opening on a rectangular plan shaped tall building under wind load

Prasenjit Sanyal,Sujit Kumar Dalui

doi:10.1007/s40091-018-0190-4

Abstract

The variation in pressure on various faces of a rectangular shaped tall building due to the presence of courtyard and opening is examined for a boundary layer flow condition corresponding to terrain category II of IS:875 (Part 3)-2015. ANSYS CFX is used for the simulation. Two turbulence models, k- varepsilon and shear stress transport (SST), are used in the validation of ANSYS CFX, and the results are compared with different international standards. In the presence of courtyard and opening, interesting and unusual pressure distributions on certain faces are observed due to a self-interference effect. Flow patterns around the building for different areas of opening are also studied to explain the phenomena occurring around the building. Furthermore, the polynomial expressions for calculating force coefficients and mean pressure coefficients of each face for different angles of attack and areas of opening are proposed using least-squares regression method. Accuracy of the fitted polynomials is measured by R2 value.

Highlights

With the continuous improvement of modern analysis and design technology and in the context of huge urban growth, the number of tall buildings and skyscrapers is increasing day by day
Unlike Model B, wind directly enters inside the courtyard from the opening for Model C, which causes change in pressure of the inner faces
This paper described the pressure variation on all the surfaces of rectangular plan shaped tall building in the presence of courtyard and opening

Summary

Introduction

With the continuous improvement of modern analysis and design technology and in the context of huge urban growth, the number of tall buildings and skyscrapers is increasing day by day. Wind pressure distribution on various faces was observed to be different from that of a square model. Muehleisen and Patrizi (2013) compared a huge set of data and derived a parametric equation of Cp. Bhattacharyya et al (2014) presented analytical and experimental results of pressure distribution on various faces of ‘E’ plan shape tall buildings for various wind incidence angles.

Results

Conclusion