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Karen Ann J Mulleners

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Related publications (45)

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Scaling of the translational velocity of vortex rings behind conical objects

Karen Ann J Mulleners, Guillaume de Guyon-Crozier

Ring vortices are efficient at transporting fluid across long distances. They can be found in nature in various ways: they propel squids, inject blood in the heart, and entertain dolphins. These vortices are generally produced by ejecting a volume of fluid ...

2021

Highly deformable flapping membrane wings suppress the leading edge vortex in hover to perform better

Karen Ann J Mulleners, Alexander Gehrke

Airborne insects generate a leading edge vortex when they flap their wings. This coherent vortex is a low-pressure region that enhances the lift of flapping wings compared to fixed wings. Insect wings are thin membranes strengthened by a system of veins th ...

2025

Data from: Event-based reconstruction of time-resolved centreline deformation of flapping flags

Karen Ann J Mulleners, Gaétan Irénée Auguste Anatole Armand Raynaud

This directory contains open-source data and code obtained at the UNFoLD laboratory at EPFL. This code implements a new tracking method for fast deformation of flapping flags using an event-based camera. Sampled data from experimental results as well as si ...

Zenodo2024

Vortex Dislocation In The Near Wake Of A Cylinder With Span-Wise Variations In Diameter

Karen Ann J Mulleners

We examined the evolution of three-dimensional vortex shedding patterns induced by spanwise variations of the cylinder diameter. Two distinct types of shedding patterns have identified through flow visualization: continuous (in-phase) oblique shedding wher ...

International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics2022

Influence Of Span-Wise Coherence In A Cylinder Wake On The Acoustic Radiations

Karen Ann J Mulleners, Guangwei He

In the present work the influence of the spanwise coherence of the flow structures on the acoustic emission in the case of cylinder wakes is investigated. For this purpose, the correlation between pressure fluctuations in the far field and velocity fluctua ...

International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics2022

Stall Delay and Leading-Edge Suction for a Pitching Airfoil with Trailing-Edge Flap

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

The flow around a pitching NACA0015 airfoil with an oscillating trailing-edge flap is experimentally investigated to characterize the influence of the flap kinematics on the development of dynamic stall. We specifically focus on the timing of the stall dev ...

2020

Identification of the trade-off between speed and efficiency in undulatory swimming using a bio-inspired robot

Auke Ijspeert, Karen Ann J Mulleners, Kamilo Andres Melo Becerra, Laura Isabel Paez Coy, Alexandros Anastasiadis

Anguilliform swimmers, like eels or lampreys, are highly efficient swimmers. Key to understanding their performances is the relationship between the body’s kinematics and resulting swimming speed and efficiency. But, we cannot prescribe kinematics to livin ...

Nature Research2023

Time scales of dynamic stall development on a vertical-axis wind turbine blade

Daniel Marie Fernex, Karen Ann J Mulleners, Sébastien Le Fouest

Vertical-axis wind turbines are excellent candidates to diversify wind energy technology, but their aerodynamic complexity limits industrial deployment. To improve the efficiency and lifespan of vertical-axis wind turbines, we desire data-driven models and ...

2023

Greenberg's Force Prediction for Vertical-Axis Wind Turbine Blades

David Yefim Bensason, Karen Ann J Mulleners, Sébastien Le Fouest

AMER INST AERONAUTICS ASTRONAUTICS2022

Lagrangian analysis of bio-inspired vortex ring formation

Karen Ann J Mulleners, Mrudhula Baskaran

Pulsatile jet propulsion is a highly energy-efficient swimming mode used by various species of aquatic animals that continues to inspire engineers of underwater vehicles. Here, we present a bio-inspired jet propulsor that combines the flexible hull of a je ...

2022

Data from: Highly deformable flapping membrane wings suppress the leading edge vortex in hover to perform better

Karen Ann J Mulleners, Alexander Gehrke

This directory contains open-source data obtained at the UNFOLD laboratory at EPFL. The data got recorded for the flexible membrane wings with different stiffnesses expressed by the aeroelastic number Ae and recorded at different angles of attack. More in ...

Zenodo2024

Reconfiguring it out: How flexible structures interact with fluid flows

Louis Paul Yvan Hutin, Karen Ann J Mulleners, Mrudhula Baskaran

Amer Physical Soc2023

Tapered foils favor traveling-wave kinematics to enhance the performance of flapping propulsion

Armelle Charlotte Marie Gas Keiser, Karen Ann J Mulleners, Pedro Miguel Nunes Pereira de Almeida Reis, Matteo Pezzulla

We report results from an experimental investigation on the fluid-structure interactions of flapping foils with tapered thickness profiles actuated in a quiescent viscous fluid. We seek to assess the propulsive performance of two sets of flapping foils; on ...

2022

Karen Ann J Mulleners

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Scaling of the translational velocity of vortex rings behind conical objects

Highly deformable flapping membrane wings suppress the leading edge vortex in hover to perform better

Data from: Event-based reconstruction of time-resolved centreline deformation of flapping flags

Vortex Dislocation In The Near Wake Of A Cylinder With Span-Wise Variations In Diameter

Influence Of Span-Wise Coherence In A Cylinder Wake On The Acoustic Radiations

Stall Delay and Leading-Edge Suction for a Pitching Airfoil with Trailing-Edge Flap

Identification of the trade-off between speed and efficiency in undulatory swimming using a bio-inspired robot

Time scales of dynamic stall development on a vertical-axis wind turbine blade

Greenberg's Force Prediction for Vertical-Axis Wind Turbine Blades

Lagrangian analysis of bio-inspired vortex ring formation

Data from: Highly deformable flapping membrane wings suppress the leading edge vortex in hover to perform better

Reconfiguring it out: How flexible structures interact with fluid flows

Tapered foils favor traveling-wave kinematics to enhance the performance of flapping propulsion

Flow Development on a Flat-Plate Wing Subjected to a Streamwise Acceleration

Review of rotating wing dynamic stall: Experiments and flow control

Proprioceptive Sensing of Soft Tentacles with Model Based Reconstruction for Controller Optimization

Dynamic stall vortex shedding and associated load fluctuations

Flowfield and Force Evolution for a Symmetric Hovering Flat-Plate Wing

Effect of pitch rate variations on the evolution of the leading edge vortex

Experimental analysis of multiscale vortex shedding in turbulent turbomachine blade wakes