On the Weis-Fogh mechanism of lift generation

@article{Lighthill1973OnTW,
  title={On the Weis-Fogh mechanism of lift generation},
  author={Michael James Lighthill},
  journal={Journal of Fluid Mechanics},
  year={1973},
  volume={60},
  pages={1 - 17}
}
  • M. Lighthill
  • Published 21 August 1973
  • Physics
  • Journal of Fluid Mechanics
Weis-Fogh (1973) proposed a new mechanism of lift generation of fundamental interest. Surprisingly, it could work even in inviscid two-dimensional motions starting from rest, when Kelvin's theorem states that the total circulation round a body must vanish, but does not exclude the possibility that if the body breaks into two pieces then there may be equal and opposite circulations round them, each suitable for generating the lift required in the pieces’ subsequent motions! The ‘fling’ of two… 

Experiments on the Weis-Fogh mechanism of lift generation by insects in hovering flight. Part 1. Dynamics of the ‘fling’

From a series of experiments using simplified mechanical models we suggest certain minor modifications to the Weis-Fogh (1973)–Lighthill (1973) explanation of the so-called ‘clap and fling’ mechanism

The Lighthill–Weis-Fogh clap–fling–sweep mechanism revisited

The Lighthill–Weis-Fogh ‘clap–fling–sweep’ mechanism for lift generation in insect flight is re-examined. The novelty of this mechanism lies in the change of topology (the ‘break’) that occurs at a

Non-Steady-State Aerodynamics of the Flight of Encarsia Formosa

Weis-Fogh (1973) demonstrated that the high lift coefficients necessary for flight in certain insects are incompatible with steady-state aerodynamics and proposed two novel mechanisms, the fling and

Weis-Fogh メカニズムの空力特性 (II)

Aerodynamic characteristics of the Weis-Fogh mechanism which is a lift generating mechanism of hovering flight of small insects were studied by the discrete vortex method. Two flat wings were

The spreading phase in Lighthill's model of the Weis-Fogh lift mechanism

  • D. Crowdy
  • Physics
    Journal of Fluid Mechanics
  • 2009
Lighthill's analysis (J. Fluid Mech., vol. 60, 1973, p. 1) of the Weis-Fogh lift mechanism is extended to include the spreading phase of the cycle. Lighthill proposed a two-dimensional inviscid

NON-STEADY-STATE AERODYNAMICS OF THE FLIGHT OF

W eis -Fogh (1973) demonstrated that the high lift coefficients necessary for flight in certain insects are incompatible with steady-state aerodynamics and proposed two novel mechanisms, the fling

The separation vortex in the Weis-Fogh circulation-generation mechanism

The influence of leading-edge separation vortices on the Weis-Fogh (1973) lift- generation mechanism for insect hovering is investigated. The analysis employs a vortex-shedding model (Edwards 1954;

Numerical Simulations of the Clap-Fling-Sweep Mechanism of Hovering Insects

TLDR
Direct numerical simulations of flapping wings using a pseudo-spectral method with volume penalization show that the 2d approximation describes very well the flow during fling, but 3d effects become crucial when the wings move far apart, as well as clarifying the role of the three-dimensionality of the wake.

Weis-Fogh clap and fling mechanism in Locusta

TLDR
Slow motion film of natural flight has revealed a mechanism of lift generation in locusts and that it occurs during forward flight to produce extra lift, and the importance of the clap and fling in generating this extra lift is well established.

Aerodynamic Characteristics of the Weis-Fogh Mechanism (H) Numerical Computations by the Discrete Vortex Method

Aerodynamic characteristics of the Weis-Fogh mechanism which is a lift generating mechanism of hovering flight of small insects were studied by the discrete vortex method. Two flat wings were
...

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