Abstract
The purpose of this research is to investigate the wind flow pattern and pressure distributions on the re-entrant wing facades of an irregular L-cross sectional shape model over the range of wind incidence angles. Computational simulation with ANSYS (CFX) solver has been used for the study on model of the building of cross-sectional area 300m<sup>2</sup> and height 50m at a length scale of 1:100. ANSYS (CFX) is a finite element modelling CFD program of pressure-based solver technology suitable for low Mach No. (Ma) fluid flow. Homogeneous flow of steady wind with gustiness of 5% turbulence in boundary layer of atmosphere is taken for the study. Investigation has been conducted for a range of wind angle of attack from 0° to 180° @ 15° interval. The findings were confirmed by examining similar wind flow on a rectangular model of same cross-sectional area and height under same boundary conditions as applied to L shape model. The results were compared with the values given in various international wind design codes/standards. For a better understanding of the flow characteristics around the L shape model in terms of flow stagnation, flow separation, creation of wakes & vortices and reattachment of flow; illustrations of flow patterns around the model for certain specific wind incidence angles are presented. On the basis of study of surface pressure generated on the model envelope, coefficient of pressure on the re-entrant corner faces has been discussed. The pressure on these wing faces has been found critical between 75° & 180° wind incident angles.
Highlights
With the rising use of new façade assemblies and unique shapes in the design of high-rise buildings, a precise description of wind action and its interaction with building shape is essential for a rational structural design approach
While considerable study has been done on regular cross-sectional shape buildings, on the basis of which many international wind design codes have been formulated, few research studies have been found on irregular-shape buildings
The present study shows that the wind incident angle has significant impact on the L shape building
Summary
With the rising use of new façade assemblies and unique shapes in the design of high-rise buildings, a precise description of wind action and its interaction with building shape is essential for a rational structural design approach. A general estimation of magnitude of wind pressure on surfaces of a bluff body is the mean pressure coefficient (CPe) , which is pressure normalised by upwind velocity/dynamic pressure 12 ρu at roof height, where ρ is density of air and u is mean wind velocity at roof height. It is a dimensionless measure independent of the velocity of flow. The oblique wind causes a varied wind flow pattern around the body, as well as varying impact pressure on the surfaces themselves
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