Journal ArticleDOI
Coherence of Grid-Generated Turbulence
John B. Roberts,David Surry +1 more
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TLDR
In this article, the lateral coherence of the upstream velocity fluctuations is derived from theoretical considerations and a simple method of computing this function from any arbitrary power spectrum is derived, which facilitates determination of the dynamic response of slender structures to wind loading.Abstract:
For the purpose of predicting the dynamic response of structures and buildings to turbulent winds, a knowledge of the lateral coherence of the upstream velocity fluctuations is essential. For the special case of isotropic turbulence, the character of the coherence function is deduced from theoretical considerations and a simple method of computing this function from any arbitrary power spectrum is derived. Particular emphasis is placed on the range of validity of simple collapsing parameters, associated with certain spectral models. The theoretical predictions are confirmed by extensive hot-wire measurements taken in grid-generated turbulence. This result facilitates determination of the dynamic response of slender structures to wind loading.read more
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Journal ArticleDOI
Lateral coherence in isotropic turbulence and in the natural wind
L. Kristensen,N. O. Jensen +1 more
TL;DR: In this paper, a short review of experimental findings is given, followed by a theoretical derivation, based on Taylor's hypothesis, of formulas for lateral coherences, assuming that the flow is stationary and homogeneous.
Journal ArticleDOI
Buffeting response of long-span cable-supported bridges under skew winds. Part 2: case study
You Lin Xu,Ledong Zhu +1 more
TL;DR: In this paper, a finite element-based framework for buffeting analysis of long-span cable-supported bridges under skew winds has been presented, which is applied to the Tsing Ma Suspension Bridge in Hong Kong.
Journal ArticleDOI
The lift on an aerofoil in grid-generated turbulence
TL;DR: In this article, a general approach, expressed in terms of a two-dimensional Fourier transform of the correlation of the buffeting force, is proposed to identify the two-wavenumber spectrum and aerodynamic admittance of the lift force on an aerofoil.
Journal ArticleDOI
Direct measurements of buffeting wind forces on bridge decks
TL;DR: In this paper, the authors evaluated the error margin of the wind load prediction based on the strip assumption for closed-box girder bridge decks, and illustrated the main findings of the experiments and illustrates the impetus behind this research.
Journal ArticleDOI
Horizontal, Two Point Coherence for Separations Greater Than the Measurement Height
W. Schlez,David Infield +1 more
TL;DR: In this paper, a new model for longitudinal and lateral coherence is proposed based on the classical exponential approach, which takes into account the influence of turbulence intensity and models the angular dependence of horizontal coherence.