Publications related to Lift-to-drag ratio

Dynamic stall on an airfoil undergoing VAWT blade angle of attack variations

Karen Ann J Mulleners, Sébastien Le Fouest, Sabrina Henne

Vertical axis wind turbines have several attractive features in the context of energy production in urban areas, but the inherent aerodynamic complexity of the flow around them has challenged their development on a larger scale. They generally operate at l ...

2020

Forces on buildings with openings and orientation in a steady post-tsunami free-surface flow

Anton Schleiss, Michael Pfister, Davide Wüthrich

Steady free-surface flows around buildings occurring during flood or tsunami events can produce major damages and a quantification of the post-peak forces is essential for safety and resilience of coastal structures. The loading process is highly affected ...

2020

Deformation of porous flexible strip in low and moderate Reynolds number flows

François Gallaire, Pedro Miguel Nunes Pereira de Almeida Reis, Matteo Pezzulla

We present results from a combined experimental and numerical investigation of the fluid-structure interaction of cantilevered porous flexible strips, towed through a fluid bath. We characterize the steady-state deformation of the strips and their associat ...

AMER PHYSICAL SOC2020

Bioinspired wing and tail morphing extends drone flight capabilities

Dario Floreano, Stefano Mintchev, Flavio Noca, Enrico Ajanic, Mir Alikhan Bin Mohammad Feroskhan

The aerodynamic designs of winged drones are optimized for specific flight regimes. Large lifting surfaces provide maneuverability and agility but result in larger power consumption, and thus lower range, when flying fast compared with small lifting surfac ...

2020

Predicting unsteady flow separation in response to a flow disturbance

Karen Ann J Mulleners, Julien Dominique Claude Deparday, Sabrina Henne, Guosheng He

We present here a summary of the activities and results of dynamically stalling airfoils from the UNFoLD lab at EPFL that have been presented at the meetings of the NATO AVT-282 discussion group on Unsteady aerodynamic response of rigid wings in gust encou ...

American Institute of Aeronautics and Astronautics, Inc2020

Extended Windage Loss Models for Gas Bearing Supported Spindles Operated in Dense Gases

Jürg Alexander Schiffmann, Kévin Rosset

Generic models are proposed to evaluate the skin friction coefficient acting on enclosed rotating disks and cylinders under various flow regimes. In particular, a model taking into account the inner radius of the disk is developed. The models are compared ...

2020

A Morphing Cargo Drone for Safe Flight in Proximity of Humans

Dario Floreano, Przemyslaw Mariusz Kornatowski, William John Stewart, Mir Alikhan Bin Mohammad Feroskhan

Delivery drones used by logistics companies today are equipped with unshielded propellers, which represent a major hurdle for in-hand parcel delivery. The exposed propeller blades are hazardous to unsuspecting bystanders, pets, and untrained users. One sol ...

2020

A 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 SCIENCE2020

Programmable Aerodynamic Drag on Active Dimpled Cylinders

Pedro Miguel Nunes Pereira de Almeida Reis, Dong Yan, Mark Andrew Guttag

This study demonstrates that the aerodynamic drag profile of a patterned deformable cylinder at high Reynolds numbers can be programmed, on demand, by modifying its topography through pneumatic actuation. The samples used in the experiments comprise a rigi ...

WILEY-V C H VERLAG GMBH2019

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Lift-to-drag ratio

Aerodynamic study of a Hyperloop pod equipped with compressor to overcome the Kantrowitz limit

Dynamic stall on an airfoil undergoing VAWT blade angle of attack variations

Forces on buildings with openings and orientation in a steady post-tsunami free-surface flow

Deformation of porous flexible strip in low and moderate Reynolds number flows

Bioinspired wing and tail morphing extends drone flight capabilities

Predicting unsteady flow separation in response to a flow disturbance

Extended Windage Loss Models for Gas Bearing Supported Spindles Operated in Dense Gases

A Morphing Cargo Drone for Safe Flight in Proximity of Humans

A bioinspired Separated Flow wing provides turbulence resilience and aerodynamic efficiency for miniature drones

Programmable Aerodynamic Drag on Active Dimpled Cylinders

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Aerodynamic study of a Hyperloop pod equipped with compressor to overcome the Kantrowitz limit

Predicting unsteady flow separation in response to a flow disturbance

Programmable Aerodynamic Drag on Active Dimpled Cylinders

A Morphing Cargo Drone for Safe Flight in Proximity of Humans

Forces on buildings with openings and orientation in a steady post-tsunami free-surface flow

Bioinspired wing and tail morphing extends drone flight capabilities

Dynamic stall on an airfoil undergoing VAWT blade angle of attack variations

Extended Windage Loss Models for Gas Bearing Supported Spindles Operated in Dense Gases

Deformation of porous flexible strip in low and moderate Reynolds number flows

A bioinspired Separated Flow wing provides turbulence resilience and aerodynamic efficiency for miniature drones