Collective Dynamics in a Complex Environment

Examensarbete för masterexamen

Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.12380/256350
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Type: Examensarbete för masterexamen
Master Thesis
Title: Collective Dynamics in a Complex Environment
Authors: Nilsson, Simon
Abstract: Collective behaviour is a phenomenon that often occurs in systems of many interacting individuals. Common macroscopic examples of collective behaviour are flocks of birds, swarms of insects and crowds of people. On the microscopic scale, it is often observed in so-called active systems, constituted by self-propelled particles, also known as active particles. Motile bacteria or synthetic microswimmers are among the most commonly studied active particles. The potential applications of collective behaviour and understanding thereof encompass multiple disciplines, ranging from robotics and medicine to algorithms, like ant colony optimization. However, the apparent complexity makes understanding an intimidating task. Despite this, simple models have proven successful in capturing the defining characteristics of such systems. This thesis examines a well-known model of active matter and expands it to incorporate necessary components to explore the effects a complex environment has on this pre-existing model. Additionally, a new model is proposed and explored in purely active systems as well as in complex environments. Simulations show that a phase transition between a gaseous state and the formation of metastable clusters occurs as the level of orientational noise decreases. Furthermore, they show that this model describes the formation of metastable channels in a crowded environment of passive particles.
Keywords: Fysik;Physical Sciences
Issue Date: 2017
Publisher: Chalmers tekniska högskola / Institutionen för fysik (Chalmers)
Chalmers University of Technology / Department of Physics (Chalmers)
URI: https://hdl.handle.net/20.500.12380/256350
Collection:Examensarbeten för masterexamen // Master Theses



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