Large Eddy Simulation of Coherent Structures over Forest Canopy

  • K. Gavrilov
  • G. Accary
  • D. Morvan
  • D. Lyubimov
  • O. Bessonov
  • S. Méradji
Part of the Notes on Numerical Fluid Mechanics and Multidisciplinary Design book series (NNFM, volume 110)


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.


Large Eddy Simulation Coherent Structure Atmospheric Boundary Layer Forest Canopy Vortex Tube 
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  1. 1.
    Kaimal, J.C., Finnigan, J.J.: Atmospheric Boundary Layer Flows. Oxford University Press, Oxford (1994)Google Scholar
  2. 2.
    Finnigan, J.: Turbulence in plant canopies. Annu. Rev. Fluid Mech. 32, 519–571 (2000)CrossRefGoogle Scholar
  3. 3.
    Marshall, B.J., Wood, C.J., Gardiner, B.A., Belcher, R.E.: Conditional sampling of canopy gusts. Boundary-Layer Meteorol 102, 225–251 (2002)CrossRefGoogle Scholar
  4. 4.
    Ghisalberti, M., Nepf, H.M.: Mixing layers and coherent structures in vegetated aquatic flows. J. of Geophys. Res. 107(2), 1–11 (2002)CrossRefGoogle Scholar
  5. 5.
    Ghisalberti, M., Nepf, H.M.: The structure of the shear layer in flows over rigid and flexible canopies. Environmental Fluid. Mech. 6, 277–301 (2006)CrossRefGoogle Scholar
  6. 6.
    Raupach, M.R., Finnigan, J.J., Brunet, Y.: Coherent eddies and turbulence in vegetation canopies: the mixing-layer analog. Boundary-Layer Meteorol. 78, 351–382 (1996)CrossRefGoogle Scholar
  7. 7.
    Brunet, Y., Irvin, M.R.: The Control of Coherent eddies in vegetation canopies: streamwise structure spacing, canopy shear scale and atmospheric stability. Boundary-Layer Meteorol. 94, 139–163 (2000)CrossRefGoogle Scholar
  8. 8.
    Watanabe, T.: Large-eddy simulation of coherent turbulence structures associated with scalar ramps over plant canopies. Boundary-Layer Meteorol. 112, 307–341 (2004)CrossRefGoogle Scholar
  9. 9.
    Moeng, C.H.: A large eddy simulation model for the study of planetary boundary-layer turbulence. J. Atmos. Sci. 41, 2052–2062 (1984)CrossRefGoogle Scholar
  10. 10.
    Patton, E.G., Shaw, R.H., Judd, M.J., Raupach, M.R.: Large-eddy simulation of windbreak flow. Boundary-Layer Meteorol. 87, 275–306 (1998)CrossRefGoogle Scholar
  11. 11.
    Accary, G., Bessonov, O., Fougère, D., Méradji, S., Morvan, D.: Optimized parallel approach for 3D modelling of foresr fire behaviour. In: Malyshkin, V.E. (ed.) PaCT 2007. LNCS, vol. 4671, pp. 96–102. Springer, Heidelberg (2007)CrossRefGoogle Scholar
  12. 12.
    Raupach, M.R., Bradley, E.F., Ghadiri, H.: A wind tunnel investigation into aerodynamic effect of forest clearings on the nesting of abbott’s Boody on Christmas Island. Internal report, CSIRO Centre for environmental Mechanics, Canberra, p. 21 (1987)Google Scholar
  13. 13.
    Shen, S., Leclerc, M.Y.: Modelling the turbulence structure in the canopy layer. Agricultural and Forest Meteorol. 87, 3–25 (1997)CrossRefGoogle Scholar

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© Springer-Verlag Berlin Heidelberg 2010

Authors and Affiliations

  • K. Gavrilov
    • 1
  • G. Accary
    • 2
  • D. Morvan
    • 3
  • D. Lyubimov
    • 1
  • O. Bessonov
    • 4
  • S. Méradji
    • 5
  1. 1.Department of Theoretical PhysicsPerm State UniversityPermRussia
  2. 2.Université Saint Esprit de KaslikJounieh Lebano
  3. 3.Technopôle de Château GombertUNIMECAMarseille cedex 13France
  4. 4.Institute for Problem in Mechanics RASMoscowRussia
  5. 5.M2P2 CNRS-Université d’Aix-MarseilleMarseilleFrance

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