3D Spatial Correlation Tensor from an L-Shaped SPIV Experiment in the Near Wall Region

Understanding the turbulence organization near a wall is necessary to help improving turbulence models. From the experimental point of view, many researchers have worked on this subject since the fifties. Recently, Foucaut et al. (Exp. Fluids 50(4, Sp. Iss. SI):839–846, 2011) [16] have proposed a new idea to compute the 3D correlation tensor from two normal velocity fields when there are two homogeneous directions in the flow. The idea of the present contribution is to propose a specific SPIV experiment which allows the computation of the full 3D spatial correlation tensor in the near wall region of the TBL. This experiment composed of two Stereoscopic PIV planes normal to the wall which were simultaneously recorded was performed in the LML wind tunnel. The 3D correlation is then computed from the two velocity planes in order to give some information about the near wall turbulence organization. Conditioning the average by specific events allows us to improve the analysis of the organisation. It can evidence the link between the events.