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Hovering of a rigid pyramid in an oscillatory airflow

  • ANNIE WEATHERS (a1), BRENDAN FOLIE (a2), BIN LIU (a3), STEPHEN CHILDRESS (a3) and JUN ZHANG (a1) (a3)...
Abstract

We investigate the dynamics of rigid bodies (hollow ‘pyramids’) placed within a background airflow, oscillating with zero mean. The asymmetry of the body introduces a net upward force. We find that when the amplitude of the airflow is above a threshold, the net lift exceeds the weight and the object starts to hover. Our results show that the objects hover at far smaller air amplitudes than would be required by a quasi-steady theory, although this theory accounts qualitatively for the behaviour of the system as the body mass becomes small.

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Email address for correspondence: binliu@cims.nyu.edu
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Journal of Fluid Mechanics
  • ISSN: 0022-1120
  • EISSN: 1469-7645
  • URL: /core/journals/journal-of-fluid-mechanics
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