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Nikolaos S. Lagopoulos

Nikolaos S. Lagopoulos
Dolprop Industries AB · Research and Development

Doctor of Philosophy

About

8
Publications
1,766
Reads
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51
Citations
Citations since 2017
8 Research Items
51 Citations
20172018201920202021202220230510152025
20172018201920202021202220230510152025
20172018201920202021202220230510152025
20172018201920202021202220230510152025
Introduction
Specialized in fluid-structure interaction with a focus on biomimetic propulsion. Currently involved in the development of marine propeller alternatives, inspired by cetacean locomotion.
Education
October 2016 - December 2020
University of Southampton
Field of study
  • Hydrodynamics of Flapping Foils
August 2015 - May 2016
Duke University
Field of study
  • Unsteady Aerodynamics
August 2014 - August 2015
KTH Royal Institute of Technology
Field of study
  • Turbomachinery

Publications

Publications (8)
Article
Reversed von Kármán streets are responsible for a velocity surplus in the wake of flapping foils, indicating the onset of thrust generation. However, the wake pattern cannot be predicted based solely on the flapping peak-to-peak amplitude and frequency because the transition also depends sensitively on other details of the kinematics. In this work...
Article
Symmetric flapping foils are known to produce deflected jets at high frequency–amplitude combinations even at a zero mean angle of attack. This reduces the frequency range of useful propulsive configurations without side force. In this study, we numerically analyse the interaction of these deflected jets for tandem flapping foils undergoing coupled...
Article
Full-text available
In this work, we describe the impact of aspect ratio ( $AR$ ) on the performance of optimally phased, identical flapping flippers in a tandem configuration. Three-dimensional simulations are performed for seven sets of single and tandem finite foils at a moderate Reynolds number, with thrust producing, heave-to-pitch coupled kinematics. Increasing...
Preprint
Full-text available
In this work, we describe the impact of aspect ratio (AR) on the performance of optimally phased, identical flapping flippers in a tandem configuration. Three-dimensional simulations are performed for seven sets of single and tandem finite foils at a moderate Reynolds number, with thrust producing, heave-to-pitch coupled kinematics. Increasing slen...
Thesis
Marine vertebrates are well known to generate thrust via the oscillatory motion of bladelike body parts (e.g flippers, tails, fins, etc.). These configurations, often depicted as flapping floils in a two dimensional domain, demonstrate impressive manoeuvrability (Read et al., 2003) without the control imprecision exhibited by contemporary manmade d...
Poster
Full-text available
Have you wondered how you could straighten your deflected flapping-foil vortex wake? As shown in the simulations above, placing a second flapping foil in tandem behind the first can straighten that wake, even when placed five-chord lengths downstream while the flow is highly perturbed! Symmetric flapping foils are known to produce deflected wakes (...
Preprint
Flapping foils are known to produce deflected jets at high frequency-amplitude combinations even at a zero mean angle of attack. This reduces the frequency range of useful propulsive configurations without side force. In this study, we analyse numerically the interaction of these deflected jets for tandem flapping foils, undergoing coupled heave to...
Preprint
Full-text available
Reversed von K\'arm\'an streets are responsible for a velocity surplus in the wake of flapping foils, indicating the onset of thrust generation. However, the wake pattern cannot be predicted based solely on the flapping peak-to-peak amplitude $A$ and frequency $f$ because the transition also depends sensitively on other details of the kinematics. I...

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