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UID:6758@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20200415T140000
DTEND;TZID=Europe/Paris:20200415T150000
DTSTAMP:20241120T201959Z
URL:https://www.i2m.univ-amu.fr/evenements/modelling-of-flexible-insect-wi
 ngs-using-mass-spring-system/
SUMMARY:Truong Hung (I2M\, Aix-Marseille University\, France): Modelling of
  flexible insect wings using mass-spring system
DESCRIPTION:Truong Hung: The secret to the spectacular flight capabilities 
 of flapping insects lies in their wings\, which are often approximated as 
 flat\, rigid plates. Real wings are however delicate structures\, composed
  of veins and membranes\, and can undergo significant deformation. In this
  talk\, we present detailed numerical simulations of such deformable wings
 . Two models of a bumblebee (Bombus ignitus) wing and a blowfly (Calliphor
 a vicina) wing\, using a mass-spring system\, are presented. The mass-spri
 ng model uses a functional approach\, thus modeling the different mechanic
 al behaviors of the veins and the membranes of the wing. Then\, numerical 
 simulations of tethered flapping insects with the flexible wings are obtai
 ned with a fluid-structure interaction solver\, coupling a mass–spring m
 odel for the flexible wing with a pseudo-spectral code solving the incompr
 essible Navier–Stokes equations. We impose the no-slip boundary conditio
 n through the volume penalization method\; the time-dependent complex geom
 etry is then completely described by a mask function. This allows solving 
 the governing equations of the fluid on a regular Cartesian grid. Our impl
 ementation for massively parallel computers allows us to perform high reso
 lution computations with up to 500 million grid points. The preliminary re
 sults obtained in this work allow us to have some understanding about the 
 role of wing flexibility in flapping flight. We found that wing flexibilit
 y hardly contributed to lift or thrust enhancement. However\, the signific
 ant reduction of the required power suggested that wing flexibility plays 
 an important role in saving flight energetic cost.\nTruong Hung\, I2M\, Ai
 x-Marseille University\, France
CATEGORIES:Interdisciplinary online seminar series on Biolocomotion
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