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| Titel |
Large-eddy simulation of the diurnal cycle of the atmospheric boundary layer and influence of the radiative forcing during the Wangara experiment. |
| VerfasserIn |
Cédric Dall'Ozzo, Bertrand Carissimo, Maya Milliez, Luc Musson-Genon, Eric Dupont |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250081086
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| Zusammenfassung |
| The ability to simulate the whole diurnal cycle of the atmospheric boundary layer in order to study the complex turbulent structures remains a difficult topic. Consequently large-eddy simulations (LES) are performed with the open source CFD code Code_Saturne [Archambeau et al., 2004]. First the code is validated on an atmospheric convective case [Schmidt and Schumann, 1989] where different subgrid-scale (SGS) models are compared: two non-dynamical SGS models [Smagorinsky, 1963] [Nicoud and Ducros, 1999] and two dynamical SGS models [Germano et al., 1991 ; Lilly, 1992] [Wong and Lilly, 1994]. Then LES are performed to simulate the whole diurnal cycle of the Wangara experiment (Day 33-34). The results are compared to measurements , RANS “k-ε“ model and other LES performed by [Basu et al., 2008] using a locally averaged scale-dependent dynamic (LASDD) SGS model. Thereafter the influence of the radiative forcing on the atmosphere is studied testing several SGS models. The results are especially discussed on nocturnal low level jet and potential temperature gradient in the stable boundary layer.
References:
[Archambeau et al., 2004] Archambeau F., Mehitoua N., Sakiz M. (2004). Code_Saturne: a finite volume code for the computation of turbulent incompressible flows. International Journal on Finite Volumes 1(1).
[Basu et al., 2008] Basu S., Vinuesa J. F., and Swift A. (2008). Dynamic LES modeling of a diurnal cycle. Journal of Applied Meteorology and Climatology, 47 :1156–1174.
[Germano et al., 1991] Germano M., Piomelli U., Moin P., and Cabot W. H. (1991). A dynamic subgrid-scale eddy-viscosity model. Physics of Fluids, A3 :1760–1765.
[Lilly, 1992] Lilly D. K. (1992). A proposed modification of the Germano subgrid-scale closure method. Physics of Fluids, A 4 :633–635.
[Schmidt and Schumann, 1989] Schmidt H. and Schumann U. (1989). Coherent structure of the convective boundary layer derived from lage-eddy simulation. Journal of Fluid Mechanics, 200 :511–562.
[Smagorinsky, 1963] Smagorinsky J. (1963). General circulation experiments with the primitive equations. i. the basic experiment. Monthly Weather Review, 91.
[Nicoud and Ducros, 1999] Nicoud F. and Ducros F. (1999). Subgrid-scale, stress modelling based on the square of the velocity gradient tensor. Flow, Turbulence and Combustion, 62 :183–200.
[Wong and Lilly, 1994] Wong V. C. and Lilly D. K. (1994). A comparison of two dynamic subgrid closure methods for turbulent thermal-convection. Physics of Fluids, 6 :1016–1023. |
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