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Karen Mulleners

EPFL STI IGM UNFOLD
MED 0 2426 (Bâtiment MED)
Station 9
1015 Lausanne

Expertise

experimental fluid dynamics, unsteady aerodynamics, vortex dynamics, flow separation
Karen Mulleners is an associate professor in the institute of mechanical engineering in the school of engineering at EPFL. She is the head of the unsteady flow diagnostics laboratory (UNFoLD). She is an experimental fluid dynamicist who focuses on unfolding the origin and development of unsteady flow separation and vortex formation. Karen studied physics in Belgium (Hasselt University, previously Limburgs Universitair Centrum) and the Netherlands (TU Eindhoven). She received her PhD in mechanical engineering from the Leibniz Universität Hannover in Germany in 2010 for her work on dynamic stall on pitching airfoils that she conducted as a member of the German aerospace centre (DLR) in Göttingen. Before joining EPFL in 2016, Karen was a (non-tenure track) assistant professor at the Leibniz Universität Hannover in Germany.

Research focus

Our lab focuses on the investigation of unsteady vortex dominated flow phenomena. We combine high spatially and temporally resolved flow field measurements with & what we refer to as & a fluid dynamical differential diagnosis. We develop methodologies to help bridge the gap between our observations and understanding of the development and interaction of vortices and technically relevant quantities, such as aerodynamic forces or power output, with applications in biological and bio-inspired flight, wind turbine rotor blade aerodynamics, etc.

Publications

2025

Event-based reconstruction of time-resolved centreline deformation of flapping flags

G. RaynaudK. Mulleners

Measurement Science and Technology. 2025. DOI : 10.1088/1361-6501/adc1e7.

Highly agile flat swimming robot

F. HartmannM. BaskaranG. RaynaudM. BenbeddaK. Mulleners  et al.

SCIENCE ROBOTICS. 2025. DOI : 10.1126/scirobotics.adr0721.

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

A. GehrkeK. Mulleners

Proceedings of the National Academy of Sciences of the United States of America. 2025. DOI : 10.1073/pnas.2410833121.

2024

Self-exploring automated experiments for discovery, optimization, and control of unsteady vortex-dominated flow phenomena

K. Mulleners

Physical Review Fluids. 2024. DOI : 10.1103/PhysRevFluids.9.124701.

Eel-like robot swims more efficiently with increasing joint amplitudes compared to constant joint amplitudes

A. AnastasiadisA. RossiL. PaezK. MeloE. D. Tytell  et al.

Physical Review Fluids. 2024. DOI : 10.1103/PhysRevFluids.9.110509.

Optimal blade pitch control for enhanced vertical-axis wind turbine performance

S. Le FouestK. Mulleners

Nature Communications. 2024. DOI : 10.1038/s41467-024-46988-0.

2023

Reconfiguring it out: How flexible structures interact with fluid flows

M. BaskaranL. HutinK. Mulleners

Physical Review Fluids. 2023. DOI : 10.1103/PhysRevFluids.8.110509.

Strength and timing of primary and secondary vortices generated by a rotating plate

D. FrancescangeliK. Mulleners

Experiments in Fluids. 2023. DOI : 10.1007/s00348-023-03667-y.

Review of rotating wing dynamic stall: Experiments and flow control

A. D. GardnerA. R. JonesK. MullenersJ. W. NaughtonM. J. Smith

Progress in Aerospace Sciences. 2023. DOI : 10.1016/j.paerosci.2023.100887.

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

S. Le FouestD. FernexK. Mulleners

Flow. Applications on Fluid Mechanics. 2023. DOI : 10.1017/flo.2023.5.

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

A. AnastasiadisL. PaezK. MeloE. D. TytellA. Ijspeert  et al.

Scientific Reports. 2023. DOI : 10.1038/s41598-023-41074-9.

2022

To tread or not to tread: comparison between water treading and conventional flapping wing kinematics

S. KrishnaA. GehrkeK. Mulleners

Bioinspiration & Biomimetics. 2022. DOI : 10.1088/1748-3190/ac9a1b.

Aeroelastic characterisation of a bio-inspired flapping membrane wing

A. GehrkeJ. RicheuxE. UksulK. Mulleners

Bioinspiration & Biomimetics. 2022. DOI : 10.1088/1748-3190/ac8632.

The dynamic stall dilemma for vertical-axis wind turbines

S. Le FouestK. Mulleners

Renewable Energy. 2022. DOI : 10.1016/j.renene.2022.07.071.

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

F. AyancikL. SiegelG. HeA. HenningK. Mulleners

Proceedings of the International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics. 2022. DOI : 10.55037/lxlaser.20th.202.

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

L. SiegelG. HeK. MullenersA. Henning

Proceedings of the International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics. 2022. DOI : 10.55037/lxlaser.20th.215.

Lagrangian analysis of bio-inspired vortex ring formation

M. BaskaranK. Mulleners

Flow. 2022. DOI : 10.1017/flo.2022.9.

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

F. AyancikK. Mulleners

Journal of Fluid Mechanics. 2022. DOI : 10.1017/jfm.2022.381.

Experimental quantification of unsteady leading-edge flow separation

J. DepardayX. HeJ. D. EldredgeK. MullenersD. R. Williams

Journal of Fluid Mechanics. 2022. DOI : 10.1017/jfm.2022.319.

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

D. BensasonS. Le FouestA. YoungK. Mulleners

Aiaa Journal. 2022. DOI : 10.2514/1.J061417.

PhD Students

https://people.epfl.ch/287838?lang=en, https://people.epfl.ch/334042?lang=en, https://people.epfl.ch/334677?lang=en, https://people.epfl.ch/342962?lang=en, https://people.epfl.ch/407163?lang=en

Past EPFL PhD Students

Swathi Krishna, Guillaume de Guyon-Crozier, Diego Francescangeli, Sébastien Le Fouest, Alexander Gehrke, Mrudhula Baskaran

Courses

Aerodynamics

ME-445

This course will provide the fluid dynamic background to understand how air flows around two- and three-dimensional wings and bodies and to understand and calculate the aerodynamics forces and moments acting on the objects as a result of the air flow.

Measurement techniques

ME-301

Theoretical and practical course on experimental techniques for observation and measurement of physical variables such as force, strain, temperature, flow velocity, structural deformation and vibrations, etc.