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Analyses of Turbulence in the Neutrally and Stably Stratified Planetary Boundary Layer: Springer Theses

Autor Cedrick Ansorge
en Limba Engleză Paperback – 15 iun 2018
This thesis presents a study of strong stratification and turbulence collapse in the planetary boundary layer, opening a new avenue in this field. It is the first work to study all regimes of stratified turbulence in a unified simulation framework without a break in the paradigms for representation of turbulence.
To date, advances in our understanding and the parameterization of turbulence in the stable boundary layer have been hampered by difficulties simulating the strongly stratified regime, and the analysis has primarily been based on field measurements. The content presented here changes that paradigm by demonstrating the ability of direct numerical simulation to address this problem, and by doing so to remove the uncertainty of turbulence models from the analysis. Employing a stably stratified Ekman layer as a simplified physical model of the stable boundary layer, the three stratification regimes observed in nature— weakly, intermediately and strongly stratified—are reproduced, and the data is subsequently used to answer key, long-standing questions.
The main part of the book is organized in three sections, namely a comprehensive introduction, numerics, and physics. The thesis ends with a clear and concise conclusion that distills specific implications for the study of the stable boundary layer. This structure emphasizes the physical results, but at the same time gives relevance to the technical aspects of numerical schemes and post-processing tools. The selection of the relevant literature during the introduction, and its use along the work appropriately combines literature from two research communities: fluid dynamics, and boundary-layer meteorology. 

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Specificații

ISBN-13: 9783319831954
ISBN-10: 331983195X
Ilustrații: XXI, 171 p. 51 illus., 46 illus. in color.
Dimensiuni: 155 x 235 mm
Greutate: 0.28 kg
Ediția:Softcover reprint of the original 1st ed. 2017
Editura: Springer International Publishing
Colecția Springer
Seria Springer Theses

Locul publicării:Cham, Switzerland

Cuprins

Preliminaries.- Introduction.- Problem Formulation and Tools.- Numerics.- Discretization.- Overlapping communication and computation.- A Test Bed for the Numerical Tool.- Physics.- The neutrally stratified Ekman Layer.- Turbulence Regimes and Stability.- Flow Organization and Global Intermittency Under Strong Stratification.- Concluding Remarks._ Implications for the Study of the Atmospheric Boundary layer.- Résumé.- Appendices.

Notă biografică

Dr. Ansorge studied meteorology at the University of Hamburg (Germany) and Monash University (Melbourne, Australia). Having worked on turbulene closures and meso-scale modelling before, he specialized in direct numerical simulation of stably stratified Ekman flow throughout his Ph.D. at the Max-Planck-Institute for Meteorology.

Textul de pe ultima copertă

This thesis presents a study of strong stratification and turbulence collapse in the planetary boundary layer, opening a new avenue in this field. It is the first work to study all regimes of stratified turbulence in a unified simulation framework without a break in the paradigms for representation of turbulence.
 
To date, advances in our understanding and the parameterization of turbulence in the stable boundary layer have been hampered by difficulties simulating the strongly stratified regime, and the analysis has primarily been based on field measurements. The content presented here changes that paradigm by demonstrating the ability of direct numerical simulation to address this problem, and by doing so to remove the uncertainty of turbulence models from the analysis. Employing a stably stratified Ekman layer as a simplified physical model of the stable boundary layer, the three stratification regimes observed in nature— weakly, intermediately and stronglystratified—are reproduced, and the data is subsequently used to answer key, long-standing questions.
 
The main part of the book is organized in three sections, namely a comprehensive introduction, numerics, and physics. The thesis ends with a clear and concise conclusion that distills specific implications for the study of the stable boundary layer. This structure emphasizes the physical results, but at the same time gives relevance to the technical aspects of numerical schemes and post-processing tools. The selection of the relevant literature during the introduction, and its use along the work appropriately combines literature from two research communities: fluid dynamics, and boundary-layer meteorology. 

Caracteristici

Nominated as an outstanding PhD thesis by the Max Planck Institute for Meteorology, Germany The first work to study all regimes of stratified turbulence in a unified simulation framework without a break in the paradigms for the representation of turbulence Offers extensive discussions on the technical and numerical aspects of the direct numerical simulation of Ekman flow Includes supplementary material: sn.pub/extras