Abstract
Abstract
Highlights
Identifying the flow structure that dominates the evolution of a turbulent boundary layer is a topic of intense historical and contemporary research
In a canonical turbulent boundary layer (TBL) an increase in Reτ is correlated to an increase in NUMZ, the present analysis demonstrates that increasing u∞/U∞
The instantaneous structure of a TBL subjected to freestream turbulence (FST) was investigated with planar particle image velocimetry (PIV)
Summary
Identifying the flow structure that dominates the evolution of a turbulent boundary layer is a topic of intense historical and contemporary research. Recent works have examined the time evolution of these structures (Laskari et al 2018), and their characteristics as a function of friction velocity Reynolds number Reτ = Uτ δ/ν (de Silva et al 2016), where Uτ is the friction velocity, δ is the boundary layer thickness and ν is the kinematic viscosity These instantaneous flow features were observed through reduced-order models of the large-scale coherence in TBLs based on the Navier–Stokes equations (Saxton-Fox & McKeon 2017; McKeon 2019). UMZs have been used in models that are able to reproduce boundary layer statistics up to fourth order (Bautista et al 2019)
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