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SUMMARY:MEchanics GAthering –MEGA- Seminar: What Rocket Turbopumps and R
 abbits Have in Common: Logistic Dynamics in Inducer Cavitation Instabiliti
 es
DTSTART:20251113T130500
DTEND:20251113T140000
DTSTAMP:20260916T232048Z
UID:b6da89031f8c9082fdbbcb2bd7abda2bdfc87eb0d9c730445b570a33
CATEGORIES:Conferences - Seminars
DESCRIPTION:Youngkuk Yoon (Seoul National University)  \nAbstract: Cavita
 tion instabilities in liquid rocket turbopump inducers—especially local 
 types—have long been a persistent challenge\, manifesting in various for
 ms depending on the operating conditions. Despite extensive studies\, thei
 r physical mechanisms have remained elusive. In this talk\, the blade-to-b
 lade interaction\, which is the effect of one blade's cavity on the flow f
 ield encountered by the following blade\, is newly proposed as a unified p
 hysical mechansim underlying these various instabilities. Examination of t
 he flow field under these instabilities reveals that this interaction exhi
 bits nonlinear behavior analogous to the logistic map popularized by Rober
 t May's demographic model. Such nonlinearity leads to bifurcations in the 
 cavity response\, where local interactions among adjacent blades evolve in
 to annulus-wide instability patterns. Further analysis shows that the emer
 gence and transition of these instability modes can be interpreted within 
 the same framework that governs bifurcation in the logistic map\, providin
 g an example of the physical and (Mitchell Feigenbaum's) mathematical univ
 ersality of nonlinear dynamical system.\n \n\nBio: Youngkuk Yoon is a Vis
 iting Research Fellow at the University of Cambridge and a Senior Research
 er at the AI Institute\, Seoul National University. He received his B.S. a
 nd Ph.D. degrees in Mechanical Engineering from Seoul National University.
  His current research interests cover aerodynamics in gas turbine engines 
 and sustainable aviation.
LOCATION:ME B1 10 https://plan.epfl.ch/?room==ME%20B1%2010 https://epfl.zo
 om.us/j/67041786969?pwd=a1lXa3lsVGpvL1VpN2RDR2l4clg0QT09
STATUS:CONFIRMED
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