Pedestrian evacuation simulation in the presence of an obstacle using self-propelled spherocylinders.

We explore the role that the obstacle position plays in the evacuation time of agents when leaving a room. To this end, we simulate a system of nonsymmetric spherocylinders that have a prescribed desired velocity and angular orientation. In this way, we reproduce the nonmonotonous dependence of the pedestrian flow rate on the obstacle distance to the door. For short distances, the obstacle delays the evacuation because the exit size is effectively reduced; i.e., the distance between the obstacle and the wall is smaller than the door width. By increasing the obstacle distance to the door, clogging is reduced leading to an optimal obstacle position (maximum flow rate) in agreement with results reported in numerical simulations of pedestrian evacuations and granular flows. For further locations, however, a counterintuitive behavior occurs as the flow rate values fall again below the one corresponding to the case without obstacle. Analyzing the head-times distribution, we evidence that this new feature is not linked to the formation of clogs, but is caused by a reduction of the efficiency of the agent's instantaneous flow rate when the exit is not blocked.

[1]  K. Huth.  Transport , 2015, Canadian Medical Association Journal.

[2]  Nirajan Shiwakoti,et al.  Examining effect of architectural adjustment on pedestrian crowd flow at bottleneck , 2018, Physica A: Statistical Mechanics and its Applications.

[3]  Lubos Buzna,et al.  Self-Organized Pedestrian Crowd Dynamics: Experiments, Simulations, and Design Solutions , 2005, Transp. Sci..

[4]  Rodrigo Escobar,et al.  Architectural Design for the Survival Optimization of Panicking Fleeing Victims , 2003, ECAL.

[5]  W. Marsden.  I and J , 2012 .

[6]  Hendrik Vermuyten,et al.  A review of optimisation models for pedestrian evacuation and design problems , 2016 .

[7]  M. Schreckenberg,et al.  Experimental study of pedestrian flow through a bottleneck , 2006, physics/0610077.

[8]  Guylène Proulx,et al.  Panic or not in fire: Clarifying the misconception , 2012 .

[9]  Kenneth Rogers.  Black Friday: Crowdsourcing Communities of Risk , 2012 .

[10]  Angel Garcimartín,et al.  Silo clogging reduction by the presence of an obstacle. , 2011, Physical review letters.

[11]  P. F. Vasconcelos,et al.  In situ immune response and mechanisms of cell damage in central nervous system of fatal cases microcephaly by Zika virus , 2018, Scientific Reports.

[12]  Tong Ran,et al.  An experimental study of the impact of an obstacle on the escape efficiency by using mice under high competition , 2017 .

[13]  Claudio O. Dorso,et al.  Room evacuation in the presence of an obstacle , 2011 .

[14]  R. Hughes.  The flow of human crowds , 2003 .

[15]  Serge P. Hoogendoorn,et al.  Pedestrian Behavior at Bottlenecks , 2005, Transp. Sci..

[16]  Nirajan Shiwakoti,et al.  Enhancing the panic escape of crowd through architectural design , 2013 .

[17]  Angel Garcimartín,et al.  Experimental proof of faster-is-slower in systems of frictional particles flowing through constrictions. , 2015, Physical review. E, Statistical, nonlinear, and soft matter physics.

[18]  Angel Garcimartín,et al.  Effect of obstacle position in the flow of sheep through a narrow door. , 2016, Physical review. E.

[19]  Alexandre Nicolas,et al.  Pedestrian flows through a narrow doorway: Effect of individual behaviours on the global flow and microscopic dynamics , 2016 .

[20]  Milad Haghani,et al.  Empirical methods in pedestrian, crowd and evacuation dynamics: Part II. Field methods and controversial topics , 2020 .

[21]  Angel Garcimartín,et al.  Redefining the role of obstacles in pedestrian evacuation , 2018, New Journal of Physics.

[22]  G. Pazour,et al.  Ror2 signaling regulates Golgi structure and transport through IFT20 for tumor invasiveness , 2017, Scientific Reports.

[23]  K. Nishinari,et al.  Introduction of frictional and turning function for pedestrian outflow with an obstacle. , 2009, Physical review. E, Statistical, nonlinear, and soft matter physics.

[24]  Nirajan Shiwakoti,et al.  Enhancing the Safety of Pedestrians during Emergency Egress , 2009 .

[25]  Zhangang Han,et al.  Obstacle Optimization for Panic Flow - Reducing the Tangential Momentum Increases the Escape Speed , 2014, PloS one.

[26]  Andreas Schadschneider,et al.  Friction effects and clogging in a cellular automaton model for pedestrian dynamics. , 2003, Physical review. E, Statistical, nonlinear, and soft matter physics.

[27]  Robert A. Meyers,et al.  Encyclopedia of Complexity and Systems Science , 2009 .

[28]  C. Dorso,et al.  Morphological and dynamical aspects of the room evacuation process , 2007 .

[29]  Cara Peters,et al.  An exploratory investigation of Black Friday consumption rituals , 2011 .

[30]  Ting Li,et al.  Optimal layout design of obstacles for panic evacuation using differential evolution , 2017 .

[31]  Bernhard Steffen,et al.  New Insights into Pedestrian Flow Through Bottlenecks , 2009, Transp. Sci..

[32]  A. Tomoeda,et al.  Analytical investigation of the faster-is-slower effect with a simplified phenomenological model. , 2013, Physical review. E, Statistical, nonlinear, and soft matter physics.

[33]  Ignacio Pagonabarraga,et al.  Clogging transition of many-particle systems flowing through bottlenecks , 2014, Scientific Reports.

[34]  Nirajan Shiwakoti,et al.  A review on the performance of an obstacle near an exit on pedestrian crowd evacuation , 2019, Safety Science.

[35]  Weiguo Song,et al.  Proceedings of Pedestrian and Evacuation Dynamics 2016 , 2017 .

[36]  Álvaro Ramírez-Gómez,et al.  Simulation of counterflow pedestrian dynamics using spheropolygons. , 2013, Physical review. E, Statistical, nonlinear, and soft matter physics.

[37]  R C Hidalgo,et al.  Simulating competitive egress of noncircular pedestrians. , 2017, Physical review. E.

[38]  Claudio Feliciani,et al.  Measurement of congestion and intrinsic risk in pedestrian crowds , 2018, Transportation Research Part C: Emerging Technologies.

[39]  Angel Garcimartín,et al.  Contact forces and dynamics of pedestrians evacuating a room: The column effect , 2020 .

[40]  Daichi Yanagisawa,et al.  Body-rotation behavior of pedestrians for collision avoidance in passing and cross flow , 2019, Transportation Research Part B: Methodological.