Examinando por Materia "PARTICULAS"

Mostrando1 - 6 de 6
  • Artículo de Publicación Periódica
    Active particles with desired orientation flowing through a bottleneck
    (2018-12) Parisi, Daniel; Cruz Hidalgo, Raúl; Zuriguel, Iker
    "We report extensive numerical simulations of the flow of anisotropic self-propelled particles through a constriction. In particular, we explore the role of the particles’ desired orientation with respect to the moving direction on the system flowability. We observe that when particles propel along the direction of their long axis (longitudinal orientation) the flow-rate notably reduces compared with the case of propulsion along the short axis (transversal orientation). And this is so even when the effective section (measured as the number of particles that are necessary to span the whole outlet) is larger for the case of longitudinal propulsion. This counterintuitive result is explained in terms of the formation of clogging structures at the outlet, which are revealed to have higher stability when the particles align along the long axis. This generic result might be applied to many different systems flowing through bottlenecks such as microbial populations or different kind of cells. Indeed, it has already a straightforward connection with recent results of pedestrian (which self-propel transversally oriented) and mice or sheep (which self-propel longitudinally oriented)."
  • Proyecto final de Grado
    Detección y seguimiento de partículas autopropulsadas
    (2018) Nardini, Gonzalo Martín; Sakuda, María Eugenia; Vázquez, Diego Nicolás; Patterson, Germán
    "El objetivo de este proyecto es diseñar e implementar un sistema de etiquetas que permita el reconocimiento individual de los agentes y el software necesario para poder realizar el proceso de tracking a partir de las las mismas."
  • Artículo de Publicación Periódica
    Flow of pedestrians through narrow doors with dierent competitiveness
    (2016) Garcimartín, Ángel; Parisi, Daniel; Pastor, José Martín; Martín-Gómez, César; Zuriguel, Iker
    "We report a thorough analysis of the intermittent flow of pedestrians through a narrow door. The observations include five diferent sets of evacuation drills with which we have investigated the efect of door size and competitiveness on the flow dynamics. Although the outcomes are in general compatible with the existence of the faster-is-slower efect, the temporal evolution of the instantaneous flow rate provides evidence of new features. These stress the crucial role of the number of people performing the tests, which has an influence on the obtained results. Once the transients at the beginning and end of the evacuation are removed, we have found that the time lapses between the passage of two consecutive pedestrians display heavy-tailed distributions in all the scenarios studied. Meanwhile, the distribution of burst sizes decays exponentially; this can be linked to a constant probability of finding a long-lasting clog during the evacuation process. Based on these results, a discussion is presented on the caution that should be exercised when measuring or describing the intermittent flow of pedestrians through narrow doors."
  • Proyecto final de Grado
    Future virtual particle method for pedestrian navigation
    (2015) Castiglione, Gonzalo; Marseillan, Agustín; Parisi, Daniel
    "This paper presents an avoidance collision method based in pedestrian self governed decisions, by calculating the position of every pedestrian in the future, a given pedestrian can adjust his velocity vector to avoid col-lisions instead of being affected by a repulsive force."
  • Tesis de maestría
    Measurements of velocity fields in a centrifugal fan by means of particle image velocimetry
    (2018) Feldle, Christian; Pritz, Balazs; Walter, Johannes
    "This thesis contains measurements of flow velocity fields inside the blade channel of a centrifugal fan by using Particle Image Velocimetry (PIV), an optical method for flow vis-ualization. The results are analyzed and compared to previous experiments. It concludes that they show a good compliance and quality. Beforehand, the fan’s characteristic curve and efficiency are determined and validated with preceding investigations. The results show a distinctive conformity with previous experi-ments and a good match with existing simulation data done by the Institute of Fluid Ma-chinery. The measurements are done at different speeds to proof the scalability. The power-train and the mounting for the camera and laser used for the experiments were modified to improve the quality of the data and to simplify the procedure of the PIV experiment. PIV measurements are measured at the points of maximum efficiency, partial load and full load, whose position on the characteristic curve were determined previously. The rotational speed is not varied in the PIV experiment, but in comparison to previous works, where only one fixed plane in the blade channel was measured, multiple planes are measured. This allows to visualize the flow in more depth and a profound knowledge about the flow con-ditions can be gathered."
  • Proyecto final de Grado
    Simulación de partículas activas con geometría definida por esfero-polígonos
    (2021-04-07) Vega, Magdalena; Guido, Sebastián; Parisi, Daniel
    "Se implementó una plataforma para realizar simulaciones de descargas de partículas autopropulsadas de recintos de geometría arbitraria y con partículas con forma de esferopolígonos que también se pueden definir por el usuario. Como caso de estudio, se analizó el problema de partículas cuadradas atravesando una apertura angosta. Se estudió la influencia de los principales parámetros del modelo (resistencia a la rotación, amplitud del ruido angular, velocidad de autopropulsión de las partículas y ancho de la apertura del recinto) en el caudal de salida y la distribución de los tiempos de salida entre partículas consecutivas. En particular, a partir de la distribución de estos tiempos de evacuación se alinean los resultados con una ley de potencia, lo que concuerda con observaciones experimentales."