Direct numerical simulations of aeolian sand ripples.

  title={Direct numerical simulations of aeolian sand ripples.},
  author={Orencio Dur{\'a}n and P. Claudin and Bruno Andreotti},
  journal={Proceedings of the National Academy of Sciences of the United States of America},
  volume={111 44},
Aeolian sand beds exhibit regular patterns of ripples resulting from the interaction between topography and sediment transport. Their characteristics have been so far related to reptation transport caused by the impacts on the ground of grains entrained by the wind into saltation. By means of direct numerical simulations of grains interacting with a wind flow, we show that the instability turns out to be driven by resonant grain trajectories, whose length is close to a ripple wavelength and… CONTINUE READING

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