BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//SFP Alpes - ECPv6.18.3//NONSGML v1.0//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
X-ORIGINAL-URL:https://sfp-alpes.fr
X-WR-CALDESC:Évènements pour SFP Alpes
REFRESH-INTERVAL;VALUE=DURATION:PT1H
X-Robots-Tag:noindex
X-PUBLISHED-TTL:PT1H
BEGIN:VTIMEZONE
TZID:Europe/Paris
BEGIN:DAYLIGHT
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:20250330T010000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:20251026T010000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:20260329T010000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:20261025T010000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:20270328T010000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:20271031T010000
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20261014T140000
DTEND;TZID=Europe/Paris:20261014T150000
DTSTAMP:20261009T130453Z
CREATED:20261009T130453Z
LAST-MODIFIED:20261009T130453Z
UID:10000301-1791986400-1791990000@sfp-alpes.fr
SUMMARY:Liuba GOSTEVA (LPMMC)
DESCRIPTION:Scaling regimes of the 1D Kuramoto-Sivashinsky equation\nRésumé : \nThe Kuramoto-Sivashinsky (KS) equation describes various phenomena exhibiting chaos and instabilities\, including flames\, reaction-diffusion processes\, and thin liquid film flows. It resembles the Kardar-Parisi-Zhang (KPZ) equation\, with the key difference being the negative « viscosity » in the KS equation. The KS equation is known to belong to the KPZ universality class: at large scales\, its statistical properties are governed by the KPZ fixed point\, characterized by the dynamical exponent $z=3/2$ and a known PDF of fluctuations. In this talk\, I will analyze the stochastic KS equation using the functional renormalization group (FRG). In this framework\, attractive fixed points of the FRG equation determine large-scale universal behavior\, while unstable fixed points govern small-scale universal behavior. I will show that the two-point correlation function exhibits\, besides the KPZ scaling at large scale\, another universal scaling regime at small scale\, with $z=1$. This scaling is very robust as it is intrinsic to the KS dynamics. It arises from the vanishing of the effective viscosity when evolving from its microscopic negative KS value\, to its macroscopic effective positive KPZ value. I will also present results from direct numerical simulations\, which confirm these findings. The talk is based on the following articles: 1 L. Gosteva\, D. Roy\, N. Wschebor\, and L. Canet\, arXiv:2605.23364 (2026). 2 L. Gosteva\, N. Wschebor\, and L. Canet\, arXiv:2607.15784 (2026). \n_ \nContact : pierre.nataf@lpmmc.cnrs.fr
URL:https://sfp-alpes.fr/event/liuba-gosteva-lpmmc/
LOCATION:LPMMC – salle Roger Maynard (G421)\, CNRS - LPMMC 25 avenue des Martyrs\, Grenoble\, 38042\, France
CATEGORIES:Séminaire
END:VEVENT
END:VCALENDAR