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Large eddy simulation of coherent structures over forest canopy

Abstract : This paper deals with the numerical simulation (using a LES approach) of the interaction between an atmospheric boundary layer (ABL) and a canopy, representing a forest cover. This problem was studied for a homogeneous configuration representing the situation encountered above a continuous forest cover, and a heterogeneous configuration representing the situation similar to an edge or a clearing in a forest. The numerical results, reproduced correctly all the main characteristics of this flow, as reported in the literature: the formation of a first generation of coherent structures aligned transversally from the wind flow direction, the reorganisation and the deformation of these vortex tubes to horse shoe structures. The results obtained, introducing a discontinuity in the canopy (reproducing a clearing or a fuel break in a forest), were compared with experimental data collected in a wind tunnel. The results confirmed the existence of a strong turbulence activity inside the canopy at a distance equal to 8 times the height of the canopy, referenced in the literature as an Enhance Gust Zone (EGZ) characterized by a local peak of the skewness factor.
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Submitted on : Wednesday, July 16, 2014 - 3:05:03 PM
Last modification on : Thursday, January 23, 2020 - 6:22:11 PM

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K. Gavrilov, Gilbert Accary, Dominique Morvan, Dimitry Lyubimov, Oleg A. Bessonov, et al.. Large eddy simulation of coherent structures over forest canopy. Deville M., Lê T-H., Sagaut P. Turbulence and Interactions: proceedings the TI 2009 conference, Springer Berlin Heidelberg, pp.143-149, 2010, Notes on Numerical Fluid Mechanics and Multidisciplinary Design, 978-3-642-14138-6. ⟨10.1007/978-3-642-14139-3_17⟩. ⟨hal-01024672⟩

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