By Cedrick Ansorge
This thesis provides a research of robust stratification and turbulence cave in within the planetary boundary layer, beginning a brand new street during this box. it's the first paintings to check 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 realizing and the parameterization of turbulence within the sturdy boundary layer were hampered through problems simulating the strongly stratified regime, and the research has basically been in line with box measurements. The content material provided right here alterations that paradigm by way of demonstrating the power of direct numerical simulation to handle this challenge, and by way of doing as a way to get rid of the uncertainty of turbulence versions from the research. utilizing a stably stratified Ekman layer as a simplified actual version of the reliable boundary layer, the 3 stratification regimes saw in nature— weakly, intermediately and strongly stratified—are reproduced, and the knowledge is for that reason used to reply to key, long-standing questions.
The major a part of the ebook is prepared in 3 sections, particularly a entire advent, numerics, and physics. The thesis ends with a transparent and concise end that distills particular implications for the examine of the good boundary layer. This constitution emphasizes the actual effects, yet whilst supplies relevance to the technical features of numerical schemes and post-processing instruments. the choice of the suitable literature in the course of the creation, and its use alongside the paintings safely combines literature from examine groups: fluid dynamics, and boundary-layer meteorology.
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