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UID:6488@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20210324T140000
DTEND;TZID=Europe/Paris:20210324T150000
DTSTAMP:20241120T201722Z
URL:https://www.i2m.univ-amu.fr/evenements/aerodynamics-of-insect-flight-a
 nd-modelling-of-wing-flexibility/
SUMMARY:Hung Truong (I2M\, Aix-Marseille Université): Aerodynamics of inse
 ct flight and modelling of wing flexibility
DESCRIPTION:Hung Truong: Insects have fascinated a large\, interdisciplinar
 y community of engineers\, biologists\, physicists and mathematicians for 
 a long time with their extraordinary capabilities of flying by flapping th
 eir wings. Insect flight has been extensively studied in the past assuming
  that insects fly with rigid wings in quiescent flow conditions. In the re
 al world\, however\, most insect wings are complex structures that consist
  of a thin\, flexible membrane supported by a network of veins. The aim of
  this project is to investigate the influence of wing flexibility on the a
 erodynamic performance of insects. For this purpose\, a wing model has bee
 n developed using a mass-spring system where the wing is discretized by ma
 ss points connected by springs. Based on different mechanical behaviors\, 
 veins are modeled as a rod using extension and bending springs while membr
 anes are modeled as a thin sheet using extension springs only. This functi
 onal approach allows us to mimic the distinctive structure and dynamics of
  insect wings. The wing model is then coupled with a fluid solver which is
  based on a spectral discretization of the three-dimensional penalized Nav
 ier–Stokes equations. The code is designed to run on massively parallel 
 supercomputers for high-resolution computations. After being validated wit
 h respect to previous works\, the code is firstly employed to simulate a t
 ethered bumblebee with flexible wings. In order to analyze the effect of w
 ing flexibility\, the Young’s modulus of wing cuticle is varied to make 
 a comparison between two different wing models that we refer to as flexibl
 e and highly flexible. We then examine a second species which is Calliphor
 a vomitoria (blowfly) in a tethered flight context. Using covariance matr
 ix adaptation evolution strategy\, the wing stiffness is optimized by comp
 aring the wing model with a set of experimental data of wing deformation i
 n response to static point forces. Our studies show that wing flexibility 
 plays an important role in minimizing flight energetic cost. Moreover\, th
 e wing inertia also helped to damp out the fluctuation of the aerodynamic 
 force and thus stabilized the insect during flight.\nIOSSB Seminar\n&nbsp\
 ;
CATEGORIES:Interdisciplinary online seminar series on
 Biolocomotion,Virtual event
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