Near Wall PIV-Measurements on the Windward Slope of a Hill etc15 Tracking Number 76Presentation: Session: Wall-bounded flows 4 Room: Room B Session start: 10:30 Thu 27 Aug 2015 Daniel Quosdorf daniel.quosdorf@tum.de Affifliation: Chair of Hydromechanics, Technische Universität München, München, Germany Ulrich Schuster ulrich.schuster@tum.de Affifliation: Chair of Hydromechanics, Technische Universität München, München, Germany Michael Manhart m.manhart@bv.tum.de Affifliation: Chair of Hydromechanics, Technische Universität München, München, Germany Topics: - Wall bounded flows Abstract: The turbulent flow over periodic hills was measured near to the wall, using planar Particle-Image-Velocimetry (PIV) at high spatial resolution. Our focus is on the near wall turbulence structure on the windward slope of the hill. For large-eddy simulation (LES) we suspect that, if this was not predicted accurately, it affects the prediction of the velocity profiles over the hill crest which in turn will affect the recirculation length downstream of the hill. Regarding the time averaged velocities, we were able to resolve the linear viscous region of the boundary layer. The velocity distribution and also the Reynolds stress does not comply with the law of the wall as it is valid for a turbulent boundary layer at equilibrium. |