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SUMMARY:New insights on the self-similar behaviour of turbulent flows - Ko
 stas Steiros\, Imperial
DTSTART:20260325T140000Z
DTEND:20260325T150000Z
UID:TALK243925@talks.cam.ac.uk
CONTACT:Anna Walczyk
DESCRIPTION:Self-similarity is a symmetry appearing in many problems of me
 chanics. If present\, it allows for a simplification of the governing part
 ial differential equations\, leading to a better understanding of the unde
 rlying physical processes. When considering turbulent flows in particular\
 , it is at the core of many well-known theoretical results (e.g.\, law of 
 the wall\, power-law evolution of free shear flows). In this talk I will d
 iscuss some recent findings: First\, I will show that the assumption of a 
 self-similar cascade in homogenous turbulence can lead to a large-scale co
 rrection to Kolmogorov’s -5/3 law. Second\, I will discuss the condition
 s of appearance of self-similarity in turbulent shear flows\; recent resul
 ts suggest that Townsend's proposition\, attributing the onset of self-sim
 ilarity to the disappearance of the memory of initial conditions\, might n
 ot be fully accurate. Third\, I will present a novel data-driven methodolo
 gy that allows the extraction of self-similar dynamics directly from data\
 , without prior knowledge of the flow physics\, nor of the underlying gove
 rning equations.
LOCATION:LT6
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