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SUMMARY:The relation between different types of transonic buffet  - Dr. Pr
 adeep Moise (University of Southampton)
DTSTART:20220211T123000Z
DTEND:20220211T133000Z
UID:TALK169148@talks.cam.ac.uk
CONTACT:99736
DESCRIPTION:Transonic buffet (TB) generally refers to the self-sustained\,
  periodic oscillations of shock waves that can occur on wings in the trans
 onic regime. It can cause strong variations in lift and structural vibrati
 ons\, thus limiting the flight envelope of aircraft.  Based on the charact
 eristics of the boundary layer at the shock foot\, TB has been further cla
 ssified as laminar or turbulent buffet. Additionally\, based on whether sh
 ock waves exist on either side of the aerofoil or only on the suction side
 \, it has been classified as Type I or Type II buffet. Distinct physical m
 echanisms have been proposed previously to govern each of these TB types. 
 To investigate the relation between these TB types\, we have performed Lar
 ge-Eddy simulations of transonic flow over infinite wing sections for a wi
 de range of flow parameters and successfully simulated each type. Using a 
 spectral proper orthogonal decomposition (SPOD)\, we have shown that these
  flows are dominated by two coherent flow features – a low-frequency buf
 fet mode and high-frequency wake modes. A low-rank reconstruction based on
 ly on the former SPOD mode allowed to tease out TB characteristics and ind
 icates that the mechanisms governing different TB types might be the same.
  Further exploration of the parametric space also suggests that shock wave
 s might not be essential for "transonic" buffet to occur. These results sh
 ed light on the mechanisms underlying TB and could potentially aid in deve
 loping strategies towards mitigating it and extending the flight envelopes
  of aircraft. 
LOCATION:CUED\, LT6
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