A Study of the Normal Turbulence Model in IEC 61400-1

Abstract

This study examines applicability of Normal Turbulence Model (NTM) in IEC 61400-1 for offshore conditions using wind records obtained at an offshore site. The model parameters for estimation of the standard deviation of longitudinal fluctuating velocity, σ₁, in NTM are presented. The identified model parameters for the mean value of σ₁ agree well with those of IEC Normal Turbulence Model, but parameters for the standard deviation of σ₁ are found to be larger than those used in IEC. As a result, the standard deviation of σ₁ obtained by IEC Normal Turbulence Model parameters is underestimated and predicted that by the proposed model parameters shows a good agreement with the observation.

Keywords

Normal Turbulence Model Model parameters Standard deviation of longitudinal fluctuating velocity

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