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Session: Passive Wake flows
Session starts: Wednesday 05 November, 10:20
Presentation starts: 10:20
Room: Commission roon 2

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Parisa Ghanoni Bostanabad ()
Woutijn Baars ()
Marios kotsonis ()

Abstract:
Flow separation with a turbulent incoming boundary layer is common in many wall-bounded flows. Understanding turbulent separated flows is critical, as they exhibit a broad range of unsteadiness. Among the various forms of unsteadiness explored, the large-scale (low-frequency) motion is the most dominant and most energetic feature, yet a consistent physical explanation in the literature is still lacking. To address this gap, the objective of the present experiment is to replicate the key physics of a pressure- induced separating flow, allowing for further investigate the spatial mechanisms linking upstream boundary-layer structures to the large-scale downstream separated region. To achieve this objective, a unique experimental setup was designed to provide initial Turbulent Boundary Layer (TBL) growth over a flat plate, followed by a curvature. Combined with variations in angle of attack, this allows different extents of separated flow without reattachment. A two-dimensional particle image velocimetry (PIV) system with three side-by-side cameras was used to acquire instantaneous velocity fields that simultaneously captured the incoming boundary layer and the separated shear layer.