The mixing layer instability of wind over a flexible crop canopy

Charlotte Py; Emmanuel de Langre; Bruno Moulia

doi:10.1016/j.crme.2004.03.005

The mixing layer instability of wind over a flexible crop canopy

Presented by: Évariste Sanchez-Palencia

Charlotte Py ¹; Emmanuel de Langre ¹; Bruno Moulia ²

¹ Département de mécanique, LadHyX, CNRS-École polytechnique, 91128 Palaiseau cedex, France
² Unité d'Ecophysiologie des Plantes Fourragères, INRA, 86600 Lusignan, France

Comptes Rendus. Mécanique, Volume 332 (2004) no. 8, pp. 613-618.

Abstract
Résumé

A coupled fluid-stucture model is proposed to study the dynamics of a flexible crop canopy exposed to wind. The canopy is represented by an elastic continuous medium and coupled to the wind mixing layer through a drag load. The mixing layer instability is shown to remain the principle instability mechanism but its characteristics are modified when taking into account the flexible canopy. The size of the coherent structures is decreased as well as the instability growth rate.

Un modèle couplé fluide-structure est proposé pour l'étude de la dynamique d'un couvert végétal souple soumis au vent. Le couvert est représenté par un milieu élastique et couplé à la couche de mélange du vent par une force de traînée. L'instabilité de couche de mélange reste le mécanisme principal d'instabilité, mais ses caracteristiques sont modifiées par la prise en compte du couvert souple : la taille des structures cohérentes est réduite ainsi que le taux d'amplification de l'instabilité.

Received: 2003-09-29
Accepted: 2004-03-09
Published online: 2004-05-14

DOI: 10.1016/j.crme.2004.03.005

Keywords: Fluid mechanics, Fluid structure interactions, Plant biomechanics, Mixing layer instability
Mots-clés : Mécanique des fluides, Interactions fluide structure, Biomécanique des plantes, Instabilité de couche de mélange

Author's affiliations:

Charlotte Py ¹; Emmanuel de Langre ¹; Bruno Moulia ²

¹ Département de mécanique, LadHyX, CNRS-École polytechnique, 91128 Palaiseau cedex, France
² Unité d'Ecophysiologie des Plantes Fourragères, INRA, 86600 Lusignan, France

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     title = {The mixing layer instability of wind over a flexible crop canopy},
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Charlotte Py; Emmanuel de Langre; Bruno Moulia. The mixing layer instability of wind over a flexible crop canopy. Comptes Rendus. Mécanique, Volume 332 (2004) no. 8, pp. 613-618. doi : 10.1016/j.crme.2004.03.005. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2004.03.005/

References
Cited by

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[3] T. Farquhar; J. Zhou; H. Haslach A possible mechanism for sensing crop canopy ventilation (F. Barth; J. Humprey; T. Secomb, eds.), Sensors and Sensing in Biology and Engineering, Springer, Wien, 2003 (Chapter 15)

[4] O. Doaré, B. Moulia, E. de Langre, Effect of plant interaction on wind-induced crop motion, Trans. ASME J. Biomech. Engrg. (2004) in press

[5] P. Huerre; M. Rossi Hydrodynamic instabilities in open flows (C. Godrèche; P. Manneville, eds.), Hydrodynamics and Nonlinear Instabilities, Cambridge University Press, Cambridge, 1998, pp. 81-294

[6] R.L. Panton Introduction to stability and transition, Incompressible Flow, Wiley-Interscience, New York, 1996 (Chapter 22)

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