23-130 Butterfly Flight Aerodynamics in Altered

Il y a 2 mois

Lyon, France CNES - Centre National d'Etudes Spatiales Temps plein

Doctorat, 36 mois
- Temps plein
- Moins de 2 ans d’expérience
- Master, DESS, DEA, Bac+5
- Material Sciences in Microgravity

**Mission**:
When flapping their wings, butterflies generate vortices around them that are producing both the thrust they need to advance and the lift needed not to fall, compensating gravity. PHOeBUS is a scientific project, by a consortium of physicists and entomologists whose initial phase has been supported by the French Space Agency (CNES) in view of parabolic flights, and whose aim is to understand this subtle aerodynamic coupling by its modification in altered gravity.
In the absence of gravity for instance, flapping its wings as if on Earth, the butterfly would produce the same lift, which however would induce a vertical bias to its trajectory. Exploring the capability of butterflies to adjust their flapping motion and adapt to various gravity levels is a way of understanding both fundamental aerodynamics and behavioural response from the butterflies and develop new bio-inspired strategies for future innovations in Aeronautics and Unmanned Aerial Vehicles.

The goal of this PhD project is to provide a detailed experimental characterization of butterflies’ flights in altered gravity, and to provide the evolutions of the flapping flight characteristics (flapping frequency and amplitude, relative position of the wings relative to the body, orientation of the body relative to gravity and butterfly trajectory, etc ) as a function of the level of gravity. Two conditions will be explored during this PhD:

- hyper gravity conditions, on a rotating table available at the Laboratoire de Physique (ENS de Lyon) where the effect of centrifugal forces result in an enhanced effective-gravity.
- parabolic flight campaigns for both micro-gravity and hyper-gravity periods.

The work plan of the PhD project will be the following:

- First experimental campaigns on parabolic flights (year 2). The experimental setup will be adapted to the constraints of parabolic flights, and a complete data-set will be derived from this study.
- Measurements of flow field generated by butterflies (year 3). Advanced optical velocimetry techniques will be adapted to study the flow field (and in particular the vorticity field) generated by butterflies in both hyper and micro gravity. This data set will be compared to numerical simulations led at Chiba University.

============

**Profil**:
Fluid
mechanics and/or aerodynamics

**Infos pratiques**:
LPENSL

**Mot du recruteur**:

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