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Lehrende: Prof. Dr. Juan Pedro Mellado González
Veranstaltungsart:
Vorlesung
Anzeige im Stundenplan:
MET-M-BLM-L
Semesterwochenstunden:
2
Credits:
3,0
Unterrichtssprache:
Englisch
Min. | Max. Teilnehmerzahl:
- | 50
Kommentare/ Inhalte:
1. Introduction. Turbulence, boundary layers, modeling. Governing equations.
2. Defining properties of turbulent flows.
3. Statistical description of turbulent flows.
4. The phenomenology of Taylor-Richardson-Kolmogorov. Energy cascade, two-point correlation, spectra and the 5/3 law.
5. Reynolds decomposition, mean equations and turbulent fluxes. Closure problem. Turbulence kinetic energy.
6. Turbulence modeling and simulation: RANS and K-theory, LES, DNS.
7. Boundary layers. Processes, structure and regimes.
8. Integral analysis and mixed layer models. Parametric studies of boundary layer properties. Entrainment models. Dimensional Analysis.
9. Neutral boundary layers. Application of K-theory. Surface wind, Ekman pumping and inertial oscillations.
10. The surface layer. Monin-Obukhov similarity theory. Bulk transfer coefficients. Roughness and heterogeneity. Application to mixed layer models.
11. Convective boundary layers. Entrainment and gravity waves. Mixed-layer models. K-profile parametrizations.
12. Stable boundary layers. Inertial oscillations and gravity waves, global intermittency. Stability corrections to K-theory and subgrid-scale models, total-energy models.
13. Moisture. Drying and moistening regimes, Bowen ratio and cloud formation.
14. Special/optional topics: Karman-Howarth equation; Boundary-layer clouds; diurnal cycle and other transients; gravity currents (cold pools); internal boundary layers.
Lernziel:
This course is an introduction to the theory and the modeling of turbulence and boundary layers and their role in the climate system. This includes the discussion of the properties of turbulent flows, their statistical description, turbulent fluxes, the Richardson cascade and Kolmogorov theory. The students also learn the typical profiles and dominant processes in convective and stable boundary layers, surface effects and entrainment. The modeling block introduces mixed-layer models, RANS, large eddy simulation and direct numerical simulation.
Literatur:
- Pope, Turbulent Flows, Cambridge University Press, 2000.
- J. C. Wyngaard, Turbulence in the Atmosphere, Cambridge University Press, 2010
- J. R. Garratt, The Atmospheric Boundary Layer, Cambridge University Press, 1992
Modulkürzel:
MET-M-BLM-L
Zusätzliche Hinweise zu Prüfungen:
Attending lectures (60h), self-studies (90h), exam preparation (30h)
The students are expected to hand-in written reports of take-home assignments approximately every 2-3 weeks, working in groups of 2 or 3 people to foster teamwork. This will contribute to 30% of the final grade; 70% is the final exam.
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