Based on a 3D simulation of the air flow around a vehicle, the Extended Proper Orthogonal Decomposition (EPOD) is employed in order to identify the existing relation between aerodynamic events around the door mirror (Ω domain) and the near acoustic pressure field (S domain). The aerodynamic pressure field on a 2D plan of Ω is decomposed using a classical formulation of POD. These modes are then sorted according to their correlation to the acoustic pressure field. The modes for which this correlation value is higher than a given threshold are selected. The proposed threshold determination is detailed. The selected modes are then employed in an EPOD procedure in order to determine their contribution to the acoustic pressure field. The aerodynamic pressure field reconstructed by these selected modes has a good correlation with the acoustic pressure field. This correlation is higher than the correlation between the aerodynamic pressure field reconstructed by the most energetic modes and the acoustic pressure field.

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