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We study with DNS the stably stratified turbulent Ekman layer at moderately high Reynolds number, 1600 < Re < 2500. Following the standard conventions, Re is defined with the laminar Ekman layer thickness and the geostrophic wind. The stratification is quantified by the friction Monin-Obukhov lengthscale L+, which varies from L+=inf down to L+~300. In the case with the strongest stratification, laminar and turbulent patches in the form of inclined bands coexist in the flow whereas in cases with weaker stratification the turbulence is continuous but strongly affected by stratification. We present one-point and two-point statistics and investigate the influence of rotation and stratification on the length scales and boundary layer height.
Author(s):
Enrico Deusebio
Linne FLOW Centre, Royal Institute of Technology, Stockholm, Sweden
Sweden
Philipp Schlatter
Linne FLOW Centre, Royal Institute of Technology, Stockholm, Sweden
Sweden
Geert Brethouwer
Linne FLOW Centre, Royal Institute of Technology, Stockholm, Sweden
Sweden
Erik Lindborg
Linne FLOW Centre, Royal Institute of Technology, Stockholm, Sweden
Sweden