ESPCI web site
Séminaire Café (Interne)
Il s’agit d’un exposé assez court (20 min) et assez informel.
Prière aux conférencier·ère·s de ne jamais dépasser 30 min et de vérifier la compatibilité avec le projecteur avant le séminaire.
Les séminaires ont lieu les jeudis après la réunion du laboratoire qui débute à 13h30 dans la bibliothèque du labo sur le campus Jussieu, Barre Cassan, Bât A, 1er étage.
Pour suggérer un titre et envoyer un abstract, contacter Antoine Bouvier <
>
et Jeanne Moscatelli <
>
.
Coffee seminars are supposed to be short and informal presentations (20 min).
Please never last longer than 30 min and check the compatibility of the projector with your computer before the seminar.
Location : Campus Jussieu, Barre Cassan, Bât A, 1er étage
7 quai Saint Bernard
75005 Paris
To suggest a title or send an abstract, please contact Antoine Bouvier <>
and Jeanne Moscatelli <>
.
| 12 décembre | PhD defense : Maud Dobler |
| 19 décembre | PhD defense : Juan Pimienta |
| 26 décembre | Christmas holidays |
| 2 janvier | Christmas holidays |
| 9 janvier | PhD student : Elias Lundheim & Jules Tampier |
| 16 janvier | Mina Jafari, Doctorante à l’Institut d’Alembert Theoretical and Numerical Modeling of Hydro-Sedimentary Flows for Geophysical Applications Hydro-sedimentary avalanches, such as debris flows, are an increasing risk in mountainous regions, exacerbated by climate change and soil degradation. These flows, composed of water and sediments, pose significant threats to terrestrial and marine ecosystems, human health, and infrastructure. However, modeling these complex, multiphase events at large scales is challenging due to their non-linear, non-Newtonian nature. This work introduces a bi-layer simulation framework using the shallow water approximation, implemented in the Basilisk framework, to capture the dynamics of such events from a broader perspective. The approach integrates non-Newtonian rheological models, including visco-plastic and granular models, to describe the sedimentary nature of debris flows in a continuous manner. By superposing a water layer on top of these complex sediment layers, we investigate the impact of precipitation on the dynamics of a dry sedimentary bed, muddy flow, or other phases of debris flows. Preliminary results will focus on the interaction between layers with different rheologies, examining their influence on key parameters such as velocity, flow thickness, and run-out distance. The model is validated against both new and existing analytical solutions. |
| 23 janvier | Basile Dhote, Doctorant au laboratoire FAST Orientation de flotteurs déformables dans un champs de vagues We investigate the slow, second order motion of thin flexible floating strips drifting in surface gravity waves. We introduce a diffractionless model (Froude-Krylov approximation) that neglects viscosity, surface tension, and radiation effects. This model predicts a mean yaw moment that favors a longitudinal orientation of the strip, along the direction of wave propagation, and a small reduction in the Stokes drift velocity. Laboratory experiments with thin rectangular strips of polypropylene show a systematic rotation of the strips towards the longitudinal position, in good agreement with our model. We finally observe that the mean angular velocity towards the stable longitudinal orientation decreases as the strip length increases, an effect likely due to dissipation, which is not accounted for in our inviscid model. |
| 30 janvier | Basile Poujol, Doctorant au laboratoire LMD Convective clouds as hydrodynamic dipoles Tropical convective clouds tend to spontaneously organize into various geometric patterns at the mesoscale (10-100 km). This organization affects the Earth’s radiative budget and is a significant source of uncertainty in climate change projections. While most studies on the organization of convection have focused on thermodynamic causes of convective aggregation, here we explore a simple model in which convective clouds are regarded as hydrodynamic dipoles. We study the circulation around convective clouds, compare it against satellite and in situ observations, and finally explore the potential impacts of this circulation on the interaction between different clouds and the subsequent convective organization. |
