Anti-hairpin vortices in the buoyancy-driven turbulent boundary layer

2020/10/22 by Cagri Metin, Metin, Cagri, Mehmet Akif Ezan +1
Engineering · Environmental Science · #FOS: Physical sciences #Fluid Dynamics (physics.flu-dyn) #Fluid Dynamics and Turbulent Flows #Heat Transfer Mechanisms #Wind and Air Flow Studies

paper · pdf · doi:10.48550/arxiv.2010.11500

openalex publication_date 2020/10/22 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

Here we show the hairpin vortices point the upstream direction of flow instead of downstream, and this characteristic is found intrinsic behavior for turbulent buoyancy-driven boundary layer. We uncover the coherent vortices straddle high-speed streak instead of low-speed streak; moreover, the quadrant of the tangential Reynolds shear stresses dominates the first and third quadrant instead of the second and fourth one. These findings may help to improve our understanding of buoyancy-driven flow and buoyancy effects in turbulent models.

Related

• Hairpins et al. in Turbulent Boundary Layers
• The structure of a turbulent boundary layer studied by numerical simulation
• The Structure of Turbulence in Pulsatile Flow over Urban Canopies
• Interference and heat transfer between hairpin vortices in wakes behind staggered hills
• Large-scale mean flow and inclination of isolated turbulent band in channel flow