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Lift is a fundamental aerodynamic force that acts perpendicular to the direction of airflow. It plays a central role in achieving and sustaining flight and in stabilizing various vehicles. Lift primarily originates from pressure differences created across surfaces, such as an airfoil. A lower pressure region forms above the wing, while a higher pressure region forms below it, generating an upward force. This differential results from the shape and orientation of the airfoil, enabling the wing...
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Flapping Soft Fin Deformation Modeling using Planar Laser-Induced Fluorescence Imaging
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Experiments and numerical simulations on hovering three-dimensional flexible flapping wings.

D Diaz-Arriba1,2, T Jardin1, N Gourdain1

  • 1ISAE-Supaero, Université de Toulouse, France.

Bioinspiration & Biomimetics
|September 2, 2022
PubMed
Summary
This summary is machine-generated.

This study assesses flapping wing aerodynamics for hovering flight. Wing flexibility and mass significantly impact lift generation by altering flapping dynamics and vortex formation.

Keywords:
aerodynamicsflapping wingsfluid–structure interactionvortices

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Area of Science:

  • Fluid Dynamics
  • Aerodynamics
  • Bio-inspired Engineering

Background:

  • Hovering flight in nature relies on complex wing kinematics.
  • Understanding unsteady aerodynamics is crucial for bio-inspired flight.

Purpose of the Study:

  • To evaluate high-fidelity experimental and numerical methods for analyzing 3D flapping wings in hover.
  • To investigate the influence of mass and frequency ratios on flapping wing performance and dynamics.

Main Methods:

  • High-fidelity experimental analysis.
  • Numerical simulations of three-dimensional flapping wings.
  • Exploration of mass and frequency ratios.

Main Results:

  • Time-averaged lift increases with frequency ratio up to a point.
  • Wing bending and flexibility induce phase lags, causing negative lift phases.
  • Spanwise bending dominates wing dynamics, affecting wake interactions and leading-edge vortex formation.

Conclusions:

  • Wing flexibility and mass ratio are critical parameters influencing hovering flight efficiency.
  • The interplay between flapping frequency, mass, and wing dynamics dictates aerodynamic performance.
  • Understanding these complex interactions is key for designing efficient flapping-wing systems.