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Karen Ann J Mulleners

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Publications associées (48)

Experimental quantification of unsteady leading-edge flow separation

Karen Ann J Mulleners, Julien Dominique Claude Deparday

We propose here a method to experimentally quantify unsteady leading-edge flow separation on aerofoils with finite thickness. The methodology relies on the computation of a leading-edge suction parameter based on measured values of the partial circulation ...

Cambridge University Press2022

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

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

AMER INST AERONAUTICS ASTRONAUTICS2022

Strategy for diagnosing the degree of dynamic stall on a vertical-axis wind turbine blade

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

Vertical axis wind turbines boast several advantages over their horizontal counterparts. Their development and large-scale installation has been limited due to their inherent aerodynamic complexity and in particular due to the occurrence of dynamic stall. ...

Amer Inst Aeronautics & Astronautics2022

All you need is time to generalise the Goman-Khrabrov dynamic stall model

Fatma Ayancik Cinoglu, Karen Ann J Mulleners

Dynamic stall on airfoils negatively impacts their aerodynamic performance and can lead to structural damage. Accurate prediction and modelling of the dynamic stall loads are crucial for a more robust design of wings and blades that operate under unsteady ...

Cambridge University Press2022

Asymmetry of timescales, loads, and flow structures for a vertical-axis wind turbine blade undergoing dynamic stall

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

Vertical-axis wind turbines have the potential to increase the share of primary energy from wind. The development of vertical-axis wind turbines for large-scale application has been limited by their self-starting capabilities and the occurrence of dynamic ...

Amer Inst Aeronautics & Astronautics2022

Aeroelastic 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 Ltd2022

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

The dynamic stall dilemma for vertical-axis wind turbines

Sébastien Le Fouest, Karen Ann J Mulleners

Vertical-axis wind turbines (VAWT) are excellent candidates to complement traditional wind turbines and increase the total wind energy capacity. Development of VAWT has been hampered by their low efficiency and structural unreliability, which are related t ...

Pergamon-Elsevier Science Ltd2022

On the parametrisation of motion kinematics for experimental aerodynamic optimisation

Karen Ann J Mulleners, Alexander Gehrke

The levels of agility and flight or swimming performance demonstrated by insects, birds, fish, and even some aquatic invertebrates, are often vastly superior to what even the most advanced human-engineered vehicles operating in the same regimes are capable ...

2022

The dynamics and timescales of static stall

Sébastien Le Fouest, Karen Ann J Mulleners, 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 ...

2021

Discrete shedding of secondary vortices along a modified Kaden spiral

Karen Ann J Mulleners, Diego Francescangeli

When an object is accelerated in a fluid, a primary vortex is formed through the roll-up of a shear layer. This primary vortex does not grow indefinitely and will reach a limiting size and strength. Additional vorticity beyond the critical limit will end u ...

Cambridge University Press2021

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

Phenomenology 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 LTD2021

Experimental analysis of multiscale vortex shedding in turbulent turbomachine blade wakes

Karen Ann J Mulleners, Philipp Gilge

2020

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

Sébastien Le Fouest, Karen Ann J Mulleners, 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

Multiscale Vortex Characteristics of Dynamic Stall from Empirical Mode Decomposition

Karen Ann J Mulleners

2020

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

Effect of pitch on the flow behavior around a hovering wing

Karen Ann J Mulleners, Swathi Badala Krishna

2019

Modeling the interplay between the shear layer and leading edge suction during dynamic stall

Karen Ann J Mulleners, Julien Dominique Claude Deparday

2019

Coherent Structure Interaction During Unsteady Separation

Karen Ann J Mulleners

Unsteady flow separation in rotationally augmented flow fields plays a significant role in the aerodynamic performance of industrial rotors, including wind turbines. Current computational models underestimate the aerodynamic loads due to the inaccurate pre ...

2019

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