Analyses of turbulence in the neutrally and stably stratified planetary boundary layer /
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| Author / Creator: | Ansorge, Cedrick, author. |
|---|---|
| Imprint: | Cham, Switzerland : Springer, [2016] ©2017 |
| Description: | 1 online resource (xxi, 171 pages) : illustrations (some color) |
| Language: | English |
| Series: | Springer theses, 2190-5053 Springer theses, |
| Subject: | |
| Format: | E-Resource Book |
| URL for this record: | http://pi.lib.uchicago.edu/1001/cat/bib/11266807 |
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| 100 | 1 | |a Ansorge, Cedrick, |e author. | |
| 245 | 1 | 0 | |a Analyses of turbulence in the neutrally and stably stratified planetary boundary layer / |c Cedrick Ansorge. |
| 264 | 1 | |a Cham, Switzerland : |b Springer, |c [2016] | |
| 264 | 4 | |c ©2017 | |
| 300 | |a 1 online resource (xxi, 171 pages) : |b illustrations (some color) | ||
| 336 | |a text |b txt |2 rdacontent | ||
| 337 | |a computer |b c |2 rdamedia | ||
| 338 | |a online resource |b cr |2 rdacarrier | ||
| 490 | 1 | |a Springer theses, |x 2190-5053 | |
| 500 | |a "Doctoral thesis accepted by University of Hamburg, Hamburg, Germany." | ||
| 504 | |a Includes bibliographical references and index. | ||
| 588 | 0 | |a Online resource; title from PDF title page (SpringerLink, viewed September 22, 2016). | |
| 505 | 0 | |a Supervisor's Foreword; Parts of this thesis have been published in the following journal articles: ; Acknowledgments; Contents; Symbols and Abbreviations; Persons Mentioned in This Work; Part I Preliminaries; 1 Introduction; 1.1 Turbulence Regimes; 1.2 Global Intermittency; 1.3 Approaches to Studying the Stable Boundary Layer; 1.4 Research Proposition; References; 2 Problem Formulation and Tools; 2.1 The Governing Equations; 2.2 Non-dimensionalization and Parameter Space; 2.2.1 The Neutrally Stratified Regime; 2.2.2 Uniqueness of the Solution. | |
| 505 | 8 | |a 2.2.3 Imposing Stratification: Initial and Boundary Conditions2.2.4 Parameter Space of the Non-dimensionalized Problem; 2.3 Analysis Tools; 2.3.1 Conditional Sampling; 2.3.2 Temporally Resolved Probes; 2.4 Summary; References; Part II Numerics; 3 Discretization; 3.1 The Pressure Problem; 3.2 Spatial Discretization; 3.3 Time Stepping Schemes; 3.3.1 Explicit Runge -- Kutta Schemes; 3.3.2 Semi-implicit Runge -- Kutta Schemes; 3.3.3 Multi-level Schemes and Other Methods; 3.3.4 Choice of a Method; 3.4 Stability of the SIRK3 Scheme; 3.5 Implementation of the SIRK3 Scheme. | |
| 505 | 8 | |a 3.5.1 Rotation of the Grid: Equations Solved by the DNS3.5.2 Buffer Zone; 3.5.3 Discretization in the Interior of the Domain; 3.5.4 Dirichlet Boundary Conditions for the Semi-implicit Solver; 3.5.5 Integration of a Scalar Variable; 3.5.6 Description of the Implementation; References; 4 Overlapping Communication and Computation; 4.1 Motivation -- A Rough Estimate of the Computational Demand; 4.1.1 Memory Demand; 4.1.2 Computational Demand; 4.1.3 The Link Between Spatial Discretization and Communication; 4.2 Approach and Implementation; 4.2.1 Why Overlap Communication and Computation? | |
| 505 | 8 | |a 4.2.2 Design of the NB3DFFT Library4.2.3 Re-Organization of the Algorithm; 4.3 Performance Measurements; 4.3.1 Performance Metrics: Strong and Weak Scaling; 4.3.2 Performance on the Supercomputer juqueen; References; 5 A Test Bed for the Numerical Tool; 5.1 Behavior of the Semi-implicit Scheme When Solving a Non-linear ODE; 5.2 Analytical Solution of Ekman Flow; 5.2.1 The Stationary Laminar Solution; 5.2.2 Temporally Evolving Solution; 5.2.3 Convergence of the Errors; 5.3 Two-Dimensional Taylor -- Green Vortex; 5.4 Three-Dimensional Turbulent Ekman Layer; References; Part III Physics. | |
| 505 | 8 | |a 6 The Neutrally Stratified Ekman Layer6.1 Conventional Statistics; 6.1.1 Global Measures; 6.1.2 Vertical Profiles; 6.2 Local Versus Ensemble Statistics; 6.2.1 Data Analysis Procedure; 6.2.2 Convergence of local estimates to the ensemble mean; 6.3 External Intermittency and Its Impact in the Surface Layer; 6.3.1 Definition of external intermittency; 6.3.2 A Vorticity Source in the Outer Layer; 6.3.3 A Modified Logarithmic Law for the Mean Velocity; 6.4 Flow Synopsis; 6.5 Summary; References; 7 Turbulence Regimes and Stability; 7.1 Initial Conditions and Time Scales Under Stable Stratification. | |
| 520 | |a 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. . | ||
| 650 | 0 | |a Boundary layer (Meteorology) |x Mathematical models. | |
| 650 | 0 | |a Turbulent boundary layer. |0 http://id.loc.gov/authorities/subjects/sh85138754 | |
| 650 | 7 | |a SCIENCE |x Earth Sciences |x Geography. |2 bisacsh | |
| 650 | 7 | |a SCIENCE |x Earth Sciences |x Geology. |2 bisacsh | |
| 650 | 7 | |a Boundary layer (Meteorology) |x Mathematical models. |2 fast |0 (OCoLC)fst00837109 | |
| 650 | 7 | |a Turbulent boundary layer. |2 fast |0 (OCoLC)fst01159225 | |
| 655 | 4 | |a Electronic books. | |
| 776 | 0 | 8 | |i Print version: |a Ansorge, Cedrick. |t Analyses of turbulence in the neutrally and stably stratified planetary boundary layer. |d Cham, Switzerland : Springer, [2016] |z 3319450433 |z 9783319450438 |w (OCoLC)953843011 |
| 830 | 0 | |a Springer theses, |x 2190-5053 |0 http://id.loc.gov/authorities/names/no2010186160 | |
| 903 | |a HeVa | ||
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| 928 | |t Library of Congress classification |a QC880.4.B65 |l Online |c UC-FullText |u https://link.springer.com/10.1007/978-3-319-45044-5 |z Springer Nature |g ebooks |i 12540359 | ||