By Cedrick Ansorge
This thesis offers a examine of sturdy stratification and turbulence cave in within the planetary boundary layer, beginning a brand new street 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 reliable boundary layer were hampered by way of problems simulating the strongly stratified regime, and the research has basically been in response to box measurements. The content material provided the following adjustments that paradigm by means of demonstrating the facility of direct numerical simulation to deal with this challenge, and via doing to be able to get rid of the uncertainty of turbulence types 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 information is for this reason used to reply to key, long-standing questions.
The major a part of the e-book is prepared in 3 sections, particularly a complete creation, numerics, and physics. The thesis ends with a transparent and concise end that distills particular implications for the learn of the good boundary layer. This constitution emphasizes the actual effects, yet while provides relevance to the technical elements of numerical schemes and post-processing instruments. the choice of the correct literature in the course of the creation, and its use alongside the paintings adequately combines literature from study groups: fluid dynamics, and boundary-layer meteorology.
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