Concept
Angle de flèche
Publications associées (35)
Fluid-structure interactions of bristled wings: the trade-off between weight and drag
Pedro Miguel Nunes Pereira de Almeida Reis, Matteo Pezzulla, Yuexia Luna Lin
The smallest flying insects often have bristled wings resembling feathers or combs. We combined experiments and three-dimensional numerical simulations to investigate the trade-off between wing weight and drag generation. In experiments of bristled strips, ...
London2023The effects of kinematics, flexibility, and planform on the vortex formation and aerodynamic performance of flapping wing flight
In this thesis, the aerodynamic challenges in flapping wing flight are addressed.In particular, the effects of different wing kinematics, flexibilities, and planforms on the the leading edge vortex development and aerodynamic performance are investigated.I ...
EPFL2023Aeroelastic characterisation of a bio-inspired flapping membrane wing
Karen Ann J Mulleners, Alexander Gehrke, Esra Uksul, Jules Ange Philippe Richeux
Natural fliers like bats exploit the complex fluid-structure interaction between their flexible membrane wings and the air with great ease. Yet, replicating and scaling the balance between the structural and fluid-dynamical parameters of unsteady membrane ...
IOP Publishing Ltd2022To tread or not to tread: comparison between water treading and conventional flapping wing kinematics
Karen Ann J Mulleners, Alexander Gehrke, Swathi Badala Krishna
Hovering insects are limited by their physiology and need to rotate their wings at the end of each back-and-forth motion to keep the wing's leading edge ahead of its trailing edge. The wing rotation at the end of each half-stroke pushes the leading edge vo ...
IOP Publishing Ltd2022Effects of wing kinematics, corrugation, and clap-and-fling on aerodynamic efficiency of a hovering insect-inspired flapping-wing micro air vehicle
A flapping-wing micro air vehicle (FW-MAV) operating with aerodynamically optimal wing configuration and kinematics may save energy and thus prolong flight time. In this work, we use a computational-fluid dynamic method to investigate the effects of wing k ...
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER2021The dynamics and timescales of static stall
Karen Ann J Mulleners, Sébastien Le Fouest, Julien Dominique Claude Deparday
Airfoil stall plays a central role in the design of safe and efficient lifting surfaces. We typically distinguish between static and dynamic stall based on the unsteady rate of change of an airfoil’s angle of attack. Despite the somewhat misleading denotat ...
2021Phenomenology and scaling of optimal flapping wing kinematics
Karen Ann J Mulleners, Alexander Gehrke
Biological flapping wing fliers operate efficiently and robustly in a wide range of flight conditions and are a great source of inspiration to engineers. The unsteady aerodynamics of flapping wing flight are dominated by large-scale vortical structures tha ...
IOP PUBLISHING LTD2021A bioinspired Separated Flow wing provides turbulence resilience and aerodynamic efficiency for miniature drones
Stefano Mintchev, Matteo Di Luca
Small-scale drones have enough sensing and computing power to find use across a growing number of applications. However, flying in the low-Reynolds number regime remains challenging. High sensitivity to atmospheric turbulence compromises vehicle stability ...
AMER ASSOC ADVANCEMENT SCIENCE2020Second-order sensitivity in the cylinder wake: Optimal spanwise-periodic wall actuation and wall deformation
François Gallaire, Edouard Boujo, Andrea Fani
Two-dimensional (2D) flows can be controlled efficiently using spanwise "waviness," i.e., a control (e.g., wall blowing and suction or wall deformation) that is periodic in the spanwise direction. This study tackles the global linear stability of 2D flows ...
AMER PHYSICAL SOC2019Suppressing tip vortex cavitation by winglets
Mohamed Farhat, Ali Amini, Martino Reclari
Despite the numerous remedies prescribed so far, tip vortex cavitation (TVC) remains a major issue in design and operation of diverse applications. In this paper, we experimentally investigate the effectiveness of winglets in suppressing TVC. An elliptical ...
SPRINGER2019