The Influence of the Reynolds Number on the Auto-Rotation of Samaras
As samara seeds fall from trees, they enter into auto-rotation. In this way they maximize dispersal distances (Green, Am J Bot 169:1218–1224, 1998, ). In this study, we present direct numerical simulations of the autorotation of a model samara at Reynolds numbers, Re, somewhat smaller than those observed in nature. The aim is to detect the presence of a LEV, if it exists, and to understand how the kinematics of the seed are related to the vortical structures of the flow.
This work was supported by grant TRA2013-41103-P of the Spanish Ministry of Economy and Competitiveness. This grant includes FEDER funding. MGV was partially supported by a grant of the BBVA Foundation. The code was partially developed during a stay of MM (funded by BBVA) and MGV (funded by the Spanish Ministry of Education through the program José Castillejo) at the Karlsruhe Institute of Technology.
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