BEGIN:VCALENDAR VERSION:2.0 PRODID:-//seminaires//NONSGML kigkonsult.se iCalcreator 2.41.92// CALSCALE:GREGORIAN METHOD:PUBLISH UID:38666563-6235-4164-b635-373662343261 X-WR-CALNAME:iCagenda X-WR-CALDESC:Event Management Extension for Joomla! X-WR-RELCALID:3E26604A-50F4-4449-8B3E-E4F4932D05B5 X-WR-TIMEZONE:Europe/Paris BEGIN:VTIMEZONE TZID:Europe/Paris TZUNTIL:20281029T010000Z BEGIN:STANDARD TZNAME:CET DTSTART:20251026T030000 TZOFFSETFROM:+0200 TZOFFSETTO:+0100 RDATE:20261025T030000 RDATE:20271031T030000 END:STANDARD BEGIN:DAYLIGHT TZNAME:CEST DTSTART:20260329T020000 TZOFFSETFROM:+0100 TZOFFSETTO:+0200 RDATE:20270328T020000 RDATE:20280326T020000 END:DAYLIGHT END:VTIMEZONE BEGIN:VEVENT UID:34653135-3061-4530-b464-633735636464 DTSTAMP:20261030T013037Z CATEGORIES:Séminaire mécanique des fluides CLASS:PUBLIC DESCRIPTION;ALTREP="CID:": \nTitle: \;Simulation of gas-liquid flows using piecewise-quadratic in terface reconstructions\n \;\nFabien EvrardAssistant ProfessorAerospac e EngineeringUniversity of Illinois Urbana-Champaign\nAbstract: \;Gas- liquid flows involving complex interface deformation and breakup\, such as those encountered in liquid atomization\, are central to many technologie s and natural processes\, including fuel injection in propulsion systems\, powder production through spray drying\, and the generation of sea spray aerosols at the surface of the ocean. Despite their prevalence\, gas-liqui d flows remain notoriously difficult to simulate. Accurately predicting th eir dynamics requires numerical methods capable of resolving the intricate evolution of the interface between the immiscible phases\, while also fai thfully capturing the effects of surface tension. Among the wide variety o f numerical frameworks developed for this purpose\, approaches based on th e geometric Volume-of-Fluid (VOF) method have proven highly effective. The ir sharp representation of the gas-liquid interface and exact local conser vation of phase volume make them particularly well suited to flows involvi ng significant interface deformation and numerous topological changes. How ever\, conventional geometric VOF methods also face important limitations associated with their piecewise-linear representation of the interface. Th is choice limits the order of accuracy of the interface transport and can lead to the artificial breakup of liquid structures\, such as the spurious pinch-off of liquid ligaments or puncture of thin liquid sheets.In this t alk\, we will present recent developments toward a VOF framework built upo n piecewise-quadratic interface representations. We will show\, through a collection of numerical test cases\, that the proposed approach retains th e geometric and conservative strengths of traditional VOF methods\, while enabling higher accuracy and offering new capabilities for subgrid-scale i nterface capturing and modeling. These developments open the door to more computationally tractable and robustly mesh-convergent simulations of liqu id atomization and other gas-liquid flows involving complex interface dyna mics.Bio: \;Fabien Evrard is an Assistant Professor of Aerospace Engin eering at the University of Illinois Urbana-Champaign. He received a Diplô me d'Ingénieur in Aerospace Engineering from the ISAE-SupAéro and an M.Res . in Fundamental and Applied Mathematics from the University of Toulouse\, followed by a Ph.D. in Mechanical Engineering from Imperial College Londo n. He was awarded a Marie Skłodowska-Curie Actions Global Postdoctoral Fel lowship and recently received the W. R. Marshall Award from the Institute for Liquid Atomization and Spray Systems. Fabien's research focuses on the modeling of strongly coupled multiphase flows using direct and large-eddy simulation\, with applications ranging from plume-surface interactions du ring powered spacecraft landing to metal powder production via ultrasonic atomization for additive manufacturing.---- DTSTART:20260925T090000Z DTEND:20260925T090000Z GEO:00;0 LOCATION: ORGANIZER: SEQUENCE:1 SUMMARY:Fabien Evrard\, UIUC\, USA TRANSP:OPAQUE URL:https://www.dalembert.upmc.fr/seminaires/index.php/683-fabien-evrard-ui uc-usa/2026-09-25-11-00?layout=vcal END:VEVENT END:VCALENDAR