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INVESTIGATION OF THE TURBULENT NEAR-WAKE SQUARE CYLINDER BY MEANS OF THE EMPIRICAL MODE DECOMPOSITION

Nicolas Mazellier
Laboratoire PRISME, Universite d'Orleans, 8, rue Leonard de Vinci, 45071 Orleans cedex 2, France

Stephane Loyer
Laboratoire PRISME Universite d'Orleans 8 rue Leonard de Vinci 45072 Orleans cedex 2 France

Azeddine Kourta
Univ. Orleans, INSA-CVL, PRISME EA 4229, F45072, Orleans, France

Résumé

The near-wake of a square cylinder is investigated by means of the Empirical Mode Decomposition. This processing technique is coupled to a separation criterion to extract both the coherent and the turbulent fluctuations of the experimental time series. The performance of the extraction procedure is emphasized by analysing energy spectrum and probability density functions. The statistics of the Reynolds stresses of both the coherent and turbulent fluctuations are then reported and analysed. It is found that the properties of the coherent and turbulent fluctuations differ noticeably.