Numerical modeling of coherent structures attendant on impurity propagation in the atmospheric boundary layer over a forest canopy

K. Gavrilov (1) , Dominique Morvan (2) , Gilbert Accary (3) , D.V. Lyubimov (4) , Sofiane Meradji (5) , Oleg A. Bessonov (6)

1 Department of Theoretical Physics
2 M2P2 - Laboratoire de Mécanique, Modélisation et Procédés Propres
3 USEK - Université Saint-Esprit de Kaslik
4 Perm State University
5 IMATH - Institut de Mathématiques de Toulon - EA 2134
6 institute for Problems in Mechanics [Moscow]

Three-dimensional large eddy simulation is used to solve the problem for a homogeneous forest canopy. The development of the Kelvin-Helmholtz instability above the canopy leads to the formation of coherent structures in the atmosphere flow, which are reproduced in the calculations. The statistical characteristics of the flow obtained from the numerical modeling are compared with experimental data. The passive admixture transfer from the canopy to the clean atmosphere is studied for two cases, namely, for constant and variable coupled concentration of the impurity in the canopy.

Mots clés: large eddy simulation; turbulence in the forest canopy; coherent structures

Domaines: Mécanique des fluides [physics.class-ph]; Mécanique des fluides [physics.class-ph]

K. Gavrilov, Dominique Morvan, Gilbert Accary, D.V. Lyubimov, Sofiane Meradji, et al.. Numerical modeling of coherent structures attendant on impurity propagation in the atmospheric boundary layer over a forest canopy. Fluid Dynamics / Izvestiya Akademii Nauk - Mekhanika Zhidkosti i Gaza, 2011, 46 (1), pp.138-147. ⟨10.1134/S0015462811010169⟩. ⟨hal-01030826⟩