Print Email Facebook Twitter The near-wake of discrete roughness elements on swept wings Title The near-wake of discrete roughness elements on swept wings: Tomographic PTV measurements Author Zoppini, G. (TU Delft Aerodynamics) Michelis, Theodorus (TU Delft Aerodynamics) Ragni, D. (TU Delft Wind Energy) Kotsonis, M. (TU Delft Aerodynamics) Date 2022 Abstract This work presents the first reported experimental characterization of the flow field in the direct vicinity of discrete roughness elements (DRE), in a swept wing boundary layer. High magnification tomographic Particle Tracking Velocimetry (3D-PTV) measurements are used to acquire time-averaged velocity and standard deviation fields in a 3D volume directly aft of the DRE elements. The collected data detail the near-element flow topology, providing information on the developing wake and emerging flow structures, their organization and amplitude evolution. A transient growth behaviour is identified in the element wake, while onset and growth of crossflow instabilities is observed further downstream. As such, the near element flow is confirmed to be a fundamental part of the receptivity process, contributing in setting the initial amplitudes for the crossflow instability evolution. To reference this document use: http://resolver.tudelft.nl/uuid:696e5ee9-db20-4e93-b9da-29c2e86d4643 Embargo date 2023-06-01 Event 12th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2022, 2022-07-19 → 2022-07-22, Osaka, Virtual, Japan Bibliographical note Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public. Part of collection Institutional Repository Document type conference paper Rights © 2022 G. Zoppini, Theodorus Michelis, D. Ragni, M. Kotsonis Files PDF 18.pdf 2.65 MB Close viewer /islandora/object/uuid:696e5ee9-db20-4e93-b9da-29c2e86d4643/datastream/OBJ/view