By Cedrick Ansorge
This thesis offers a research of sturdy stratification and turbulence cave in within the planetary boundary layer, commencing a brand new road during this box. it's the first paintings to review all regimes of stratified turbulence in a unified simulation framework and not using a holiday within the paradigms for illustration of turbulence.
To date, advances in our realizing and the parameterization of turbulence within the strong boundary layer were hampered by means of problems simulating the strongly stratified regime, and the research has basically been in line with box measurements. The content material awarded right here alterations that paradigm via demonstrating the facility of direct numerical simulation to handle this challenge, and via doing to be able to get rid of the uncertainty of turbulence versions from the research. applying a stably stratified Ekman layer as a simplified actual version of the solid boundary layer, the 3 stratification regimes saw in nature— weakly, intermediately and strongly stratified—are reproduced, and the knowledge is thus used to respond to key, long-standing questions.
The major a part of the e-book is equipped in 3 sections, specifically a accomplished creation, numerics, and physics. The thesis ends with a transparent and concise end that distills particular implications for the research of the good boundary layer. This constitution emphasizes the actual effects, yet while provides relevance to the technical facets of numerical schemes and post-processing instruments. the choice of the appropriate literature throughout the creation, and its use alongside the paintings accurately combines literature from learn groups: fluid dynamics, and boundary-layer meteorology.
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