By Cedrick Ansorge
This thesis provides a research of robust stratification and turbulence cave in within the planetary boundary layer, establishing a brand new road during this box. it's the first paintings to review all regimes of stratified turbulence in a unified simulation framework with no holiday within the paradigms for illustration of turbulence.
To date, advances in our knowing and the parameterization of turbulence within the strong boundary layer were hampered by means of problems simulating the strongly stratified regime, and the research has basically been in accordance with box measurements. The content material offered right here adjustments that paradigm via demonstrating the power of direct numerical simulation to deal with this challenge, and by way of doing so that you could get rid of the uncertainty of turbulence versions from the research. using 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 to that end used to reply to key, long-standing questions.
The major a part of the ebook is geared up in 3 sections, particularly a complete 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 offers relevance to the technical points of numerical schemes and post-processing instruments. the choice of the correct literature through the creation, and its use alongside the paintings correctly combines literature from learn groups: fluid dynamics, and boundary-layer meteorology.
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Extra resources for Analyses of Turbulence in the Neutrally and Stably Stratified Planetary Boundary Layer
2008). Direct numerical simulation of the Ekman layer: A step in Reynolds number, and cautious support for a log law with a shifted origin (Retracted article. See, vol. 21, art. no. 109901, 2009). Physics of Fluids, 20(10), 101507. doi:10. 3005858. Spalart, P. , Coleman, G. , & Johnstone, R. (2009). Retraction: “Direct numerical simulation of the Ekman layer: A step in Reynolds number, and cautious support for a log law with a shifted origin” [Phys. Fluids 20, 101507 (2008)]. Physics of Fluids, 21(10), 109901.
3247176. Tritton, D. , & Davies, P. A. (1981). Instabilities in geophysical fluid dynamics. In: H. L. Swinney, & J. P. ), Hydrodynamic instabilities and the transition to turbulence. Berlin: Springer. van de Wiel, B. J. , Moene, A. , Jonker, H. J. , et al. (2012). The minimum wind speed for sustainable turbulence in the nocturnal boundary layer. Journal of the Atmospheric Sciences, 69(11), 3116–3127. 1. Part II Numerics Chapter 3 Discretization DNS of a turbulent flow requires a discretization of the governing Navier–Stokes equations in both time and space.
The possible coexistence of nonturbulent and turbulent fluid in a statistically homogeneous manifold of a turbulent flow domain was already recognized by Corrsin (1943, cf. Chap. 1 of the present work). Phenomena at the turbulent–non-turbulent interface—namely external intermittency and entrainment—play a pivotal role in the development of boundary layers with a free stream. The successful (experimental) distinction between turbulent and non-turbulent fluid based on the instantaneous vorticity magnitude allows to separate the flow domain into a turbulent and non-turbulent part (Corrsin and Kistler 1955).