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DTSTART;TZID=Europe/Rome:20240516T101500
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DTSTAMP:20260508T012516
CREATED:20240510T132654Z
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UID:31611-1715854500-1715860800@www.dica.polimi.it
SUMMARY:Earthquake Response: The Case of Turkey and Morocco (2023)
DESCRIPTION:Giovedì 16 maggio alle ore 10:15 presso l’aulas B.5.2 (Building 14 – Nave\, Politecnico di Milano\, piazza Leonardo da Vinci 32) si terrà un seminario dal titolo: “Earthquake Response: The Case of Turkey and Morocco (2023)“\, tenuto da Giulia Jole Sechi (PhD candidate on the role of digital technology in informal settlements construction at Universitat Internacional de Catalunya\, Barcelona). \nSarà anche possibile seguire il seminario online via Webex tramite il seguente link. \nSpeaker’s bio \nGiulia Jole Sechi graduated in 2013 in civil structural engineering from Politecnico di Milano with a thesis partially written in Peru on earth dwellings reinforced with used car tyre straps. She then lived two years in Chad and three years in New Zealand\, where she worked on the 2010-2011 Christchurch and 2016 Kaikoura earthquakes. Giulia also worked in Nepal with UNDP for the 2015 Gorkha earthquake\, before going to Tanzania and India. She has worked as structural engineering consultant for Miyamoto International on the 2021 Haiti earthquake response and is now Associate Engineer at Miyamoto International. As part of her job she was deployed in Turkey after the 2023 Turkey-Syria earthquake and in Morocco after the September 2023 earthquake. She is also currently pursuing her PhD on the role of digital technology in informal settlements construction at Universitat Internacional de Catalunya\, Barcelona.
URL:https://www.dica.polimi.it/en/evento/earthquake-response-the-case-of-turkey-and-morocco-2023/
CATEGORIES:Seminari e conferenze
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DTSTART;TZID=Europe/Rome:20240516T143000
DTEND;TZID=Europe/Rome:20240516T163000
DTSTAMP:20260508T012516
CREATED:20240502T080138Z
LAST-MODIFIED:20240502T080138Z
UID:31608-1715869800-1715877000@www.dica.polimi.it
SUMMARY:Simulation of concentrated non-Brownian frictional and adhesive suspensions in linear and nonlinear flows
DESCRIPTION:Giovedì 16 maggio alle ore 14:30 presso l’Aula 7.1.3 (Edificio 7 – p.za Leonardo da Vinci\, 32 – Milano) si terrà un seminario dal titolo: “Simulation of concentrated non-Brownian frictional and adhesive suspensions in linear and nonlinear flows“\, tenuto da Michel Orsi (Postdoctoral Research Associate and an Adjunct Assistant Professor at the Levich Institute of the City College of New York). \nAbstract \nI present a particle-scale simulation method for non-Brownian suspension flows at low Reynolds number\, based on the Fictitious Domain Method and supplemented by sub-grid lubrication corrections. In their usual form\, sub-grid corrections involve the underlying linear flow. In the present work\, the conditions required to avoid considering this ambient flow while keeping frame indifference are determined\, and a sub-grid correction matrix is built for the particle-particle and particle-wall hydrodynamic interactions such that the mentioned conditions inherently hold. This procedure extends the correct use of such sub-grid corrections to nonlinear flows. Then\, I show the role of adhesive forces in frictional suspensions\, by varying both the intensity of adhesion and the volume fraction: after presenting the difficulties of simulating adhesive suspensions at low volume fractions due to particle depletion at the wall and shear-banding\, I show that the relative viscosity of the suspension is a function of both volume fraction and shear stress. The variation of the viscosity with these two parameters may be understood in the usual frame of suspension jamming\, provided that the jamming volume fraction now depends on the dimensionless suspension stress that involves the adhesive force between particles. The variation of the jamming volume fraction with stress may be interpreted as the variation of the yield stress with volume fraction. This curve separates the plane (volume fraction\, shear stress) into two regions: one in which the suspension flows and the other in which it jams. I continue by investigating the shear-induced particle migration in a pressure-driven channel suspension flow. In such a system\, particles are driven toward the channel center\, resulting in a volume fraction gradient across the channel and a plug region where the jamming volume fraction as measured in shear flow may be exceeded. The flow profile is thus highly nonlinear\, both due to the pressure gradient and the time-varying concentration gradient\, which justifies the use of the present numerical method. I compare the results to a modified version of the Suspension Balance Model\, confirming the well-known limits of such a model in the plug region. Finally\, I thoroughly show that the computed stresses obey the usual momentum balance in the channel: the tangential stress is indeed driven by the pressure gradient as predicted by theory and the second normal stress (parallel to the velocity gradient) does not vary over the channel width\, although contact and hydrodynamic contributions significantly do over both time and space. This confirms the good behavior of the present numerical method when nonlinear flows are tackled. \nSpeaker’s bio \nMichel Orsi got a Bachelor’s degree in Aerospace Engineering and a Master’s degree in Aeronautical Engineering with specialization in Aerodynamics\, both at Politecnico di Milano. To complete his Master’s thesis\, he went to the Fluid Mechanics and Acoustics Laboratory of the Ecole Centrale de Lyon\, where he studied the passive scalar dispersion and mixing in homogeneous isotropic turbulence under the supervision of Pietro Salizzoni\, Maurizio Boffadossi\, and Raffaele Marino. Then\, he joined Elisabeth Lemaire’s group at the Institute of Physics of Nice to pursue a PhD in Physics under the supervision of François Peters and Laurent Lobry\, during which he developed a cutting-edge particle-scale numerical method able to correctly simulate both the full hydrodynamics (short- and long-range) and the direct interactions between the particles. He is now a Postdoctoral Research Associate and an Adjunct Assistant Professor at the Levich Institute of the City College of New York\, where he is working with Jeff Morris on the direct visualization and mechanical analysis of roller processing of chocolate refining paste and on the rigidity development in shear-thickening dense suspensions.
URL:https://www.dica.polimi.it/en/evento/simulation-of-concentrated-non-brownian-frictional-and-adhesive-suspensions-in-linear-and-nonlinear-flows/
CATEGORIES:Seminari e conferenze
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DTSTART;TZID=Europe/Rome:20240516T173000
DTEND;TZID=Europe/Rome:20240516T183000
DTSTAMP:20260508T012516
CREATED:20240502T122339Z
LAST-MODIFIED:20240502T122339Z
UID:31609-1715880600-1715884200@www.dica.polimi.it
SUMMARY:DICA4Agenda2030: Il crollo delle torri gemelle: Ingegneria Strutturale vs. tesi complottiste
DESCRIPTION:Partecipa giovedì 16 Maggio\, dalle 17:30 alle 18:30\, al seminario condotto dal Prof. Enrico Masoero nell’ambito del Festival dello Sviluppo Sostenibile 2024. Il seminario intitolato ‘Il crollo delle torri gemelle: Ingegneria Strutturale vs. tesi complottiste‘ sarà trasmesso online via Webex previa iscrizione\, una volta registrati si riceverà via e-mail il link per seguire il seminario. \n\nForm d’iscrizione all’evento\n\nDescrizione attività \n11 Settembre 2001: due aerei di linea\, dirottati da terroristi\, si schiantano sulle Torri Gemelle del World Trade Centre\, a New York City. Dopo ore di incendio\, entrambe le torri crollano\, facendo oltre 3000 vittime. L’evento ha trasformato la vita degli Americani e la politica internazionale\, a tal punto da destare sospetti che fossero coinvolti proprio i Servizi Segreti americani. Tra queste tesi complottiste\, il seminario affronterà la più estrema\, cioè che il crollo delle torri sia stato in realtà causato da esplosivi pre-impiantati dai Servizi Segreti negli edifici. Questa idea è nata guardando al modo in cui sono crollate le torri; modo che è difficile spiegare come risultato dell’impatto degli aerei ma che invece ricorda molto il crollo di edifici durante le demolizioni controllate con esplosivo. In questo seminario\, l’analisi strutturale del crollo proverà a dimostrarci che non c’era bisogno di esplosivi: riuscirà a convincerci?
URL:https://www.dica.polimi.it/en/evento/dica4agenda2030-il-crollo-delle-torri-gemelle-ingegneria-strutturale-vs-tesi-complottiste/
CATEGORIES:Seminari e conferenze,Webinar e Workshop
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