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VERSION:2.0
PRODID:-//Memento EPFL//
BEGIN:VEVENT
SUMMARY:Stability analysis of three-dimensional open flows
DTSTART:20170117T111500
DTEND:20170117T121500
DTSTAMP:20260406T214700Z
UID:678f97755eb86e8c07c670f82e7dcc526dec3584a8de71e87f48b434
CATEGORIES:Conferences - Seminars
DESCRIPTION:Lorenzo Siconolfi\, University of Pisa\nBio: Since 2013\, Lore
 nzo Siconolfi is a PhD student at University of Pisa under the supervision
  of Prof. S. Camarri and Prof. M.V. Salvetti with a thesis entitled “Sta
 bility and sensitivity analysis for flow control”. His academic work is 
 focused on two main research topics: the study of passive methods for lami
 nar to turbulent transition delay in boundary layers and the sensitivity a
 nalysis of globally unstable flows aimed at the stability control. Through
  these activities and the collaboration with professors and researchers fr
 om other universities\, he has developed a strong expertise in stability a
 nalysis and numerical simulation of complex flows.\nThe characterisation o
 f instabilities in spatially-developing open flows is a key result in flui
 d dynamics. In the last decades\, the dramatic increase of the computation
 al power has allowed to investigate the stability properties of complex fl
 ow configurations.\n \nIn the first part of the seminar\, some examples o
 f global and local stability analysis for three-dimensional flow cases wil
 l be presented\, oriented to the design of flow control strategies.\n \nI
 n the second part\, weakly non-parallel flows are considered\, where the W
 KBJ asymptotic analysis provides a rigorous strategy to link the local and
  global stability approach (Huerre & Monkewitz\, Annual Review of Fluid Me
 chanics\, Vol. 22 (1990)). As already shown by several papers\, at the geo
 metrical optics\, WKBJ approximation is generally able to provide satisfac
 tory results\, even for configurations where the parallel flow assumption 
 is questionable\, as in the wake past of bluff bodies (see\, for example\,
  Juniper & Pier\, EJMFLU Vol. 49B (2015)).\n \nIt will be shown that\, co
 nsidering the physical optics level in the WKBJ approximation allows to pr
 ovide very accurate estimations of the global eigenfrequencies\, reducing 
 the error by about one order of magnitude compared to the geometrical opti
 cs approximation. Moreover\, the proposed approach is used to analyze thre
 e-dimensional flow configurations\, such as wakes past bluff bodies\, obta
 ining good results if compared to full three-dimensional global stability 
 analysis at highly reduced computational costs.
LOCATION:ME B1 B10 https://plan.epfl.ch/theme/generalite_thm_v2?lang=en&ro
 om=me%20b1%2010&dim_floor=1&dim_lang=en&tree_groups=centres_nevralgiques%2
 Cacces%2Cmobilite_reduite%2Censeignement%2Ccommerces_et_services%2Cvehi
STATUS:CONFIRMED
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