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VERSION:2.0
PRODID:-//Memento EPFL//
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SUMMARY:MEchanics GAthering -MEGA- Seminar: Flapping flags in grid-induced
  turbulent flow
DTSTART:20211216T161500
DTEND:20211216T173000
DTSTAMP:20260407T113359Z
UID:8641dd952f1b187a4531e4f3654eeac58308eddaf31de9484cf20c19
CATEGORIES:Conferences - Seminars
DESCRIPTION:Stefano Olivieri (OIST\, Japan)\nAbstract Fluid-structure int
 eraction is involved in a variety of intriguing problems and related appli
 cations\, e.g.\, energy harvesting\, bio-inspired locomotion and flow cont
 rol. Although in many situations the incoming fluid flow manifests a turbu
 lent behavior\, the fundamental investigation on this kind of problems ver
 y often relies on assuming the flow to be laminar and unperturbed. As a re
 sult\, we still lack a deep comprehension regarding the influence of incom
 ing turbulence on altering the main features of aeroelastic instabilities 
 and consequent self-sustained oscillations. We present a fully-resolved\, 
 direct numerical simulation (DNS) approach that we employ to investigate\,
  as a representative example\, the flapping motion of a flexible plate/fla
 g interacting with a turbulent incoming flow at moderate Reynolds number. 
 Turbulence is generated using a passive grid at the inlet of the numerical
  domain and the turbulence level impacting the flag can be controlled by v
 arying the distance of the latter from the grid. First\, we characterize t
 he turbulent flow generated numerically by comparing with well-known resul
 ts for decaying turbulence and experimental measurements. Then\, we revisi
 t the flag-in-the-wind problem by exploring the effect of turbulence on th
 e main features of self-sustained flapping. We show that\, whilst the latt
 er mechanism is still manifesting\, the amplitude and frequency of the osc
 illation are remarkably altered. Moreover\, we show that the fingerprint o
 f turbulent fluctuations can be qualitatively detected and effectively mod
 elled by means of spectral analysis. Besides their relevance for fundament
 al understanding\, our findings have potential impact for applications suc
 h as aeroelastic energy harvesting with passively flapping plates.\n\nBio
  Dr. Stefano Olivieri is currently a Postdoctoral Scholar in the Complex 
 Fluids and Flows Unit at the Okinawa Institute of Science and Technology (
 OIST)\, Japan. He received his B.Sc./M.Sc. in Mechanical/Aeronautical Engi
 neering and his Ph.D. in Fluid Dynamics and Environmental Engineering from
  the University of Genoa\, Italy. His research interests concern fluid-str
 ucture interaction\, bio-inspired aerodynamics as well as particle-laden f
 lows\, investigating such problems primarily by means of high-fidelity num
 erical simulations. Specifically\, recent topics include the dynamics of f
 ilament-like objects in fully-developed turbulence\, the development of pa
 ssive aeroelastic energy harvesters\, and the impact of turbulence on the 
 self-sustained flapping motion of flexible plates.
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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