• Corpus ID: 238408142

Geometry and organization of coherent structures in stably stratified atmospheric boundary layers

  title={Geometry and organization of coherent structures in stably stratified atmospheric boundary layers},
  author={Abhishek Harikrishnan and Cedrick Ansorge and Rupert Klein and Nikki Vercauteren},
Global intermittency is observed in the stably stratified Atmospheric Boundary Layer (ABL) and corresponds to having large nonturbulent flow regions to develop in an otherwise turbulent flow. In this paper, the differences between continuous and intermittent turbulence are quantified with the help of coherent structures. Eight classes of coherent structures are identified from literature, most of which are indicated by scalar criteria derived from velocity fields. A method is developed to… 
Definition, detection, and tracking of persistent structures in atmospheric flows
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An overview over the advances that have been made in the analysis of vortices in the last 40 years is provided, providing sufficient background on differential vector field calculus, extraction techniques like critical point search and the parallel vectors operator, and the notion of reference frame invariance is introduced.