Tag: elasticity

Posted on

Thrust force is tuned by the rigidity distribution in insect-inspired flapping wings

R. Antier, B. Thiria, & R. Godoy-Diana
Journal of Fluids and Structures, 124, 104043 (2024).
doi: 10.1016/j.jfluidstructs.2023.104043

We study the aerodynamics of a flapping flexible wing with a two-vein pattern that mimics the elastic response of insect wings in a simplified manner. The experiments reveal a non-monotonic variation of the thrust force produced by the wings when the angle between the two veins is varied. An optimal configuration is consistently reached when the two veins are spaced at an angle of about 20 degrees. This value is in the range of what has been measured in the literature for several insect species. The deformation of the wings is monitored during the experiment using video recordings, which allows to pinpoint the physical mechanism behind the non-monotonic behaviour of the force curve and the optimal distribution of the vein network in terms of propulsive force.

2-wing flapping system mounted on a force sensor
Posted on

Clotilde Nové-Josserand’s PhD defense. Converting wave energy from fluid–elasticity interactions

PhD defense on October 1st, 2018, 2:30pm, at the PMMH meeting room (Sorbonne Université, Barre Cassan, Bât. A 1er Étage, 7 Quai Saint Bernard, 75005 Paris).

Converting wave energy from fluid–elasticity interactions

Understanding the mechanisms involved in wave-structure interactions is of high interest for the development of efficient wave energy harvesters as well as for coastal management. In this thesis, we study the interactions of surface waves with a model array of slender flexible structures, in view of developing an efficient system for both attenuating and harvesting wave energy. The presented results are based around experimental investigations, by means of small scale facilities, in which the spatial arrangement of the flexible objects is the key parameter of Continue reading “Clotilde Nové-Josserand’s PhD defense. Converting wave energy from fluid–elasticity interactions”