Journal ArticleDOI
A wind tunnel study of the mean pressure forces acting on large groups of low-rise buildings
M. Hussain,B.E. Lee +1 more
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In this paper, the results of a series of wind tunnel tests in which the surface pressure fields of low-rise buildings have been studied were presented, showing that it is possible to describe the surface pressures on groups of lowrise buildings in terms of three types of flow regimes known to exist for the flow over general arrays of roughness elements on a surface.About:
This article is published in Journal of Wind Engineering and Industrial Aerodynamics.The article was published on 1980-10-01. It has received 127 citations till now. The article focuses on the topics: Natural ventilation & Wind tunnel.read more
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Aerodynamic Properties of Urban Areas Derived from Analysis of Surface Form
C. S. B. Grimmond,Timothy R. Oke +1 more
TL;DR: In this paper, several methods to determine the aerodynamic characteristics of a site through analysis of its surface form (morphometry) are considered in relation to cities, including zero-plane displacement length (zd), roughness length(z0), depth of the roughness sublayer, and aerodynamic conductance.
Journal ArticleDOI
The fluid mechanics of natural ventilation
TL;DR: In this paper, two forms of ventilation are discussed: mixing ventilation and displacement ventilation, where the interior is at an approximately uniform temperature and there is strong internal stratification, respectively, and the effects of wind on them are examined.
Journal ArticleDOI
Representative roughness parameters for homogeneous terrain
TL;DR: In this article, the authors draw up a set of objective requirements for experimental determination of the roughness of homogeneous terrain, particularly with respect to matching of the observation array to a terrain situation with given fetch, blending height and displacement length.
The fluid mechanics of natural ventilation
TL;DR: In this paper, two forms of ventilation are discussed: mixing ventilation and displacement ventilation, where the interior is at an approximately uniform temperature and there is strong internal stratification, respectively, and the effects of wind on them are examined.
Journal ArticleDOI
An improved method for the estimation of surface roughness of obstacle arrays
TL;DR: In this paper, an improvement upon the Lettau relationship is derived starting from fundamental principles, based on certain assumptions about the velocity profile, and the improved model includes the obstacle drag coefficient explicitly, and accounts for the peak in the z 0 versus area density curve.
References
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Journal ArticleDOI
The flow around a surface-mounted cube in uniform and turbulent streams
Ian P. Castro,A. G. Robins +1 more
TL;DR: In this article, an experimental investigation of the flow around surface mounted cubes in both uniform, irrotational and sheared, turbulent flows is described, and comparisons with the somewhat sparse measurements of previous workers are made and the relevance of recent theoretical attempts to describe the flow, as opposed to numerical calculation techniques to predict it, is briefly discussed.
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Drag measurements in roughness arrays of varying density and distribution
TL;DR: In this article, the authors examined the effect of roughness elements on the total shearing stress of cylinders of diameter/height ratio d/H of 0.5-5.
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Rough-wall boundary layers in adverse pressure gradients
A. E. Perry,P. N. Joubert +1 more
TL;DR: In this article, the effect of roughness on the flow away from the wall can be accounted for by using an equivalent viscosity νe, which depends only on the variables at the wall, such as shear stress τ 0, fluid density ρ, and the roughness size and geometry.
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Wind tunnel determination of the roughness length as a function of the fetch and the roughness density of three-dimensional roughness elements
TL;DR: In this article, the roughness length (y 0 ) has been evaluated from wind tunnel tests for various distributions of roughness elements at a number of stages in the growth of the associated boundary layer.
Journal ArticleDOI
Flow in Rough Conduits
TL;DR: In this article, a new concept of flow over rough pipe and channel surfaces is presented, based particularly on the effect of the longitudinal spacing of surface-roughness elements and their associat...