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Large-Eddy Simulati...
Large-Eddy Simulation Study of Thermally Stratified Canopy Flow
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- Nebenführ, Bastian, 1984 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Davidson, Lars, 1957 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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(creator_code:org_t)
- 2015-04-17
- 2015
- Engelska.
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Ingår i: Boundary-Layer Meteorology. - : Springer Science and Business Media LLC. - 0006-8314 .- 1573-1472. ; 156:2, s. 253-276
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Abstract
Ämnesord
Stäng
- A number of large-eddy simulations (LES) are performed for the calculation of the airflow over a horizontally homogeneous forest canopy for a wide range of thermal stability classes. For the first time, results from LES of a stably stratified canopy are also presented. Simulation results compare favourably to recent field measurements over a pine forest in south-eastern Sweden. The simple heat source model was found to perform adequately and to yield within-canopy heat-flux profiles typically observed for stable conditions in the field. Evidence was found for a layer of unstably stratified air in the canopy trunk space under stable stratification. The importance of a secondary wind-speed maximum is emphasized in stable conditions. Examination of the budget equation of turbulent kinetic energy (TKE) revealed that, during stable stratification, pressure transport plays an increasingly important role in supplying the canopy region with TKE.
Ämnesord
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Strömningsmekanik och akustik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Fluid Mechanics and Acoustics (hsv//eng)
Nyckelord
- Forest turbulence
- Large-eddy simulation
- Atmospheric boundary layer
- Thermal stratification
- Forest canopy
- Turbulent kinetic energy budget
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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