Reynolds-number effects on the outer region of adverse-pressure-gradient turbulent boundary layers
Rahul Deshpande, Aron van den Bogaard, Ricardo Vinuesa, Luka Lindić, Ivan Maruŝiĉ
Abstract
Reynolds number (Re) effects are studied in the outer region of moderate adverse-pressure-gradient (APG) turbulent boundary layers (TBLs). This study finds that the small scale (viscous) energy in an APG TBL at near-equilibrium conditions reduces with increasing friction Re. The origin of this trend is traced back to the production of turbulent kinetic energy in an APG TBL, the small scale contribution to which is also found to decrease with Re in the outer region. The results emphasize that new scaling arguments and spatial-resolution corrections should be tested rigorously across a broad range of Re, particularly for pressure gradient TBLs.
Topics & Concepts
Pressure gradientTurbulenceAdverse pressure gradientReynolds numberScalingMechanicsBoundary layerScale (ratio)Boundary (topology)Range (aeronautics)Kinetic energyReynolds stressMaterials sciencePhysicsClassical mechanicsGeometryMathematicsQuantum mechanicsMathematical analysisComposite materialFluid Dynamics and Turbulent FlowsWind and Air Flow StudiesParticle Dynamics in Fluid Flows