Coherence of Grid-Generated Turbulence

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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.

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