Separating adverse-pressure-gradient and Reynolds-number effects in turbulent boundary layers
Carlos Sanmiguel Vila, Ricardo Vinuesa, Stefano Discetti, Andrea Ianiro, Philipp Schlatter, Ramis Örlü
Abstract
Wall turbulence is characterized by a near-wall cycle of streaks and quasistreamwise vortices apparent as an invariant inner peak in the premultiplied energy spectra. A second, outer peak is known to emerge in this spectral view and become energized with increasing Reynolds number (Re) as well as adverse pressure gradient (APG). An analysis of experimental data sets examines how this outer peak scales with Re and APG and whether their imprint on the near-wall small scales are different.
Topics & Concepts
Reynolds numberTurbulenceAdverse pressure gradientPressure gradientVortexMechanicsBoundary layerFlow separationPhysicsBoundary (topology)Classical mechanicsMathematicsMathematical analysisFluid Dynamics and Turbulent FlowsWind and Air Flow StudiesHeat Transfer Mechanisms