By Cedrick Ansorge
This thesis provides a research of robust stratification and turbulence cave in within the planetary boundary layer, establishing a brand new street during this box. it's the first paintings to review all regimes of stratified turbulence in a unified simulation framework with out a holiday within the paradigms for illustration of turbulence.
To date, advances in our knowing and the parameterization of turbulence within the reliable boundary layer were hampered by way of problems simulating the strongly stratified regime, and the research has basically been in line with box measurements. The content material offered the following adjustments that paradigm via demonstrating the facility of direct numerical simulation to handle this challenge, and via doing as a way to get rid of the uncertainty of turbulence versions from the research. making use of a stably stratified Ekman layer as a simplified actual version of the good boundary layer, the 3 stratification regimes saw in nature— weakly, intermediately and strongly stratified—are reproduced, and the information is consequently used to respond to key, long-standing questions.
The major a part of the booklet is geared up in 3 sections, specifically a finished creation, numerics, and physics. The thesis ends with a transparent and concise end that distills particular implications for the learn of the reliable boundary layer. This constitution emphasizes the actual effects, yet even as offers relevance to the technical features of numerical schemes and post-processing instruments. the choice of the correct literature through the creation, and its use alongside the paintings accurately combines literature from learn groups: fluid dynamics, and boundary-layer meteorology.
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Analyses of Turbulence in the Neutrally and Stably Stratified Planetary Boundary Layer (Springer Theses) by Cedrick Ansorge