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VERSION:2.0
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SUMMARY:MEchanics GAthering -MEGA- Seminar: Talk 1 - The dynamic stall dil
 emma for vertical-axis wind turbines\; Talk 2 - Mobile robots’ navigatio
 n in dense crowds and how to measure their performance
DTSTART:20211104T161500
DTEND:20211104T173000
DTSTAMP:20260510T235006Z
UID:c12ce117630a2ff1ea2c80ef2a9aaf7d84a6e432b9693a1c65cb204f
CATEGORIES:Conferences - Seminars
DESCRIPTION:Sébastien Le Fouest (UNFoLD\, EPFL) & David Julian Gonon 
 (LASA\, EPFL)\nTalk 1: The dynamic stall dilemma for vertical-axis wind tu
 rbines\, by Sébastien Le Fouest (UNFoLD\, EPFL)\n\nAbstract Vertical-a
 xis wind turbines are great candidates for wind energy diversification and
  could contribute to reaching a near-zero carbon emission electrical grid.
  The complex aerodynamics of vertical-axis wind turbines have challenged t
 heir development and integration into urban infrastructure. The blades of 
 these turbine undergo periodic oscillations in inflow conditions\, which c
 ontinuously change the blade's effective angle of attack and flow velocity
 . These oscillations often lead to the formation of large-scale vortices a
 nd the occurrence of dynamic stall. These flow structures allow an increas
 e in torque production\, but also cause heavy load transients jeopardising
  the turbine's structural integrity and potentially leading to premature f
 ailure. This talk aims at presenting the dilemma vertical-axis wind turbin
 es face over a wide operation envelope: generating torque while ensuring s
 tructural reliability. Time-resolved flow and load measurements were perfo
 rmed to characterise the occurrence of dynamic stall on a scaled-down vert
 ical-axis wind turbine for a wide range of operating condition. The timesc
 ales of vortex formation and the corresponding impact on the unsteady load
  response are analysed. The torque generation and transient load fluctuati
 on are systematically put on a balance. The goal is to lay the ground for 
 flow control strategies that will aim at making vertical-axis wind turbine
 s reliable and efficient.\n\n\nBio Sébastien completed his bachelor and 
 master degree at Imperial College London\, where he developed a strong int
 erest for fluid mechanics applied to energy-related problems. He joined EP
 FL in 2018 to complete a doctoral thesis on the experimental investigation
  of dynamic stall on vertical-axis wind turbines.\n\nTalk 2: Mobile robots
 ’ navigation in dense crowds and how to measure their performance\, by 
 David Julian Gonon (LASA\, EPFL)\n\nAbstract Today’s mobile robots are
  able to sense objects’ shapes and motion and localize themselves in the
 ir environment. By continuously planning their own motion between obstacle
 s and executing their current plan\, they may navigate autonomously. Human
  crowds constitute particularly dynamic and therefore challenging environm
 ents from the perspective of motion planning. This talk reviews modern app
 roaches to robots’ navigation in crowds and modeling dense crowds’ dyn
 amics. Further\, the speaker’s developments using the concept of Acceler
 ation Obstacles for studying and enhancing navigation in dense crowds are 
 presented. The preliminary technique’s evaluation in simulation and an o
 utlook conclude the presentation.\n\nBio David is a doctoral student at t
 he Learning Algorithms and Systems Laboratory (LASA-IMT-STI)\, EPFL\, sinc
 e 2018. Previously\, he worked as a scientific staff member at the Institu
 te of Structural Engineering\, ETH Zürich. Gonon obtained his MSc degree 
 in Robotics\, Systems and Control in 2017 and his BSc degree in Mechanical
  Engineering in 2014\, both from ETH Zürich. His scientific interests inc
 lude robots’ motion planning and collision avoidance\, control systems\,
  computer vision\, and computational geometry.\n 
LOCATION:MED 0 1418 https://plan.epfl.ch/?room==MED%200%201418 https://epf
 l.zoom.us/j/67873367071?pwd=b0NEeWY2MFJqNGUzUitJV256YSt6QT09
STATUS:CONFIRMED
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