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DY: Fachverband Dynamik und Statistische Physik

DY 57: Focus Session: Turbulence - From Pattern Formation to Stochastic Disorder

DY 57.4: Vortrag

Donnerstag, 10. März 2016, 16:00–16:15, H46

Multi-PIV Measurements of an Adverse Pressure Gradient Turbulent Boundary Layer — •Christian Willert¹, Christian Kähler², Andreas Schröder³, Julio Soria⁴, Michel Stanislas⁵, and Jean-Marc Foucaut⁵ — ¹Institut für Antriebstechnik, Deutsches Zentrum für Luft- und Raumfahrt (DLR), Köln, Germany — ²Institut für Strömungsmechanik und Aerodynamik, Universität der Bundeswehr München — ³Institut für Aerodynamik und Strömungstechnik, DLR, Göttingen, Germany — ⁴Monash University, Melbourne, Australia — ⁵Laboratoire de Mécanique de Lille, CNRS, Villeneuve d'Ascq, France

We report on a multi-national measurement campaign aimed at providing highly resolved flow field data of a turbulent boundary layer subjected to an adverse pressure gradient (APG). In the case of APGs the structure and dynamics of large scale turbulent flow structures along with their significance on the statistical properties of the flow is not well understood. Hence the fundamental aim was to resolve and characterise the large-scale coherent structures in an APG boundary layer flow. In addition to large-field-of-view PIV measurements using 16 sCMOS cameras along a 3.5m length, stereoscopic PIV measurements were performed at specific locations in order to also resolve the span-wise velocity statistics. Long-distance, high-speed micro-PIV measurements provided near wall statistics at selected locations including the time-resolved wall shear stress. The measurements were performed in the boundary layer wind tunnel of the Laboratoire de Mécanique de Lille (LML) and funded by EuHIT (www.euhit.org).