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Mécanique du feuillage en vent : Approche multi-échelle et conséquences biologiques

Abstract : A wind gust and the leaves already move. On land, the Beaufort scale is defined through the observation of foliage motion. The leaves motion in wind is the result of fluid-structure interaction between the tree and wind. The effect of wind on the tree is on the one hand static, the leaves reconfigure, change their orientation, and gather themselves, and on the other hand dynamic, when leaves and branches move. Those mechanical effects are explored at the leaf scale, highlighting the effect of the Cauchy number, which scales the aerodynamic efforts and the leaf rigidity, onto the static reconfiguration of leaves, and the effect of reduced velocity, which compares the solid time and the fluid time, onto the trigger of leaf flutter. These results at the leaf scale are broadenned to the whole foliage. Eventually, the models of foliage movement are used to compute global biological traits such as light interception or perceptive effects such as the dynamic motion of the foliage.
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Submitted on : Wednesday, February 11, 2015 - 1:59:50 PM
Last modification on : Saturday, July 24, 2021 - 9:50:02 AM
Long-term archiving on: : Tuesday, May 12, 2015 - 11:37:05 AM


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  • HAL Id : tel-01115618, version 1


Loïc Tadrist. Mécanique du feuillage en vent : Approche multi-échelle et conséquences biologiques. Physique [physics]. École polytechnique; Université Paris Saclay, 2015. Français. ⟨tel-01115618⟩



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