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Fluid flow lifting a body from a solid surface.

Samire Balta1, Frank T Smith1

  • 1Department of Mathematics, University College London, London WC1E 6BT, UK.

Proceedings. Mathematical, Physical, and Engineering Sciences
|March 7, 2019
PubMed
Summary
This summary is machine-generated.

A sudden fluid flow can lift a body off the ground. The body may return or fly away, depending on critical flow speeds and fluid-solid interactions.

Keywords:
analysisbodyfluidgranular mediainteraction

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Area of Science:

  • Fluid dynamics
  • Solid mechanics
  • Nonlinear dynamics

Background:

  • Objects at rest on horizontal ground can be lifted by applied horizontal fluid flow.
  • This phenomenon is related to air vehicle lift-off from moving ground.

Purpose of the Study:

  • To determine the precise mechanistic conditions for lift-off, return, and fly-away of a body in a fluid flow.
  • To investigate the nonlinear fluid-solid interaction in a thin fluid gap between a body and the ground.

Main Methods:

  • Small-time analysis of lift-off dynamics.
  • Numerical simulations of fluid-solid interaction.
  • Large-time analysis to identify critical flow conditions.

Main Results:

  • Identified conditions for impulsive lift-off, return to ground, or fly-away.
  • Established a critical flow speed for fly-away for any body shape.
  • Analyzed the changing influence of ground effect during different flight phases.

Conclusions:

  • The study provides a mechanistic understanding of fluid-induced body motion.
  • Critical flow speed is a key parameter determining the body's fate (return or fly-away).
  • Findings have implications for understanding ground effect and related phenomena in fluid-structure interaction.