The Influence of the Reynolds Number on the Auto-Rotation of Samaras

  • G. ArranzEmail author
  • M. Moriche
  • M. Uhlmann
  • O. Flores
  • M. García-Villalba
Conference paper
Part of the ERCOFTAC Series book series (ERCO, volume 25)


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, [2]). 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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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  • G. Arranz
    • 1
    Email author
  • M. Moriche
    • 1
  • M. Uhlmann
    • 2
  • O. Flores
    • 1
  • M. García-Villalba
    • 1
  1. 1.Universidad Carlos III de MadridGetafeSpain
  2. 2.Karlsruhe Institue of TechnologyKarlsruheGermany

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