Centre de Physique Théorique


Mercredi 21 février 2018

16h00 – 17h00, Amphi 5 du CPT

Séminaire de Physique Statistique & Matière Condensée

Alexandre Nicolas (LPTMS, Orsay)

Titre : Bottleneck flows of pedestrian crowds and granular media

Résumé :

Several collective effects in human crowds can be accounted for without entering the complexity of the decision-making process or the detailed interactions between people. In this talk, I will focus on the evacuation of a pedestrian crowd through a narrow door. On the basis of experiments conducted by us and others [1-2], I will show that the dynamics are mostly governed by the density of people in front of the door, irrespective of the individual behaviours, at least at moderate crowd pressure, and I will point to some similarities with granular hopper flows, in particular with respect to the time gaps between successive exits. Then, I will present a model that reproduces many observed features in the dynamics and highlight the mechanisms at their origin.

[1] Garcimartín, A., Zuriguel, I., Pastor, J. M., Martín-Gómez, C., & Parisi, D. R. (2014). Experimental evidence of the “Faster Is Slower” effect. Transportation Research Procedia, 2, 760-767.
[2] Nicolas, Alexandre, Sebastián Bouzat, and Marcelo N. Kuperman. "Pedestrian flows through a narrow doorway : Effect of individual behaviours on the global flow and microscopic dynamics." Transportation Research Part B : Methodological 99 (2017).