Hardening by softening in a flow of chainlike self-driven objects |
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| Authors: | Takashi Mashiko Yasuhito Imanishi Ryota Kuwajima Takashi Nagatani |
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| Institution: | 1. College of Physical Science and Technology, Guangxi Normal University, Guilin, 541004, China;2. Department of Civil and Architectural Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong;3. School of Applied Science, Taiyuan University of Science and Technology, Taiyuan, 030024, China;1. School of Automotive and Transportation Engineering, Hefei University of Technology, Hefei 230009, People’s Republic of China;2. MOE Key Laboratory for Urban Transportation Complex Systems Theory and Technology, Beijing Jiaotong University, Beijing 100044, People’s Republic of China;3. Division of Logistics and Transportation, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, People’s Republic of China;4. Department of Modern Physics, University of Science and Technology of China, Hefei 230026, People’s Republic of China;1. MOE Key Laboratory for Urban Transportation Complex Systems Theory and Technology, Beijing Jiaotong University, Beijing 100044, China;2. School of Traffic and Transportation, Beijing Jiaotong University, Beijing 100044, China;3. Faculty of Computer Science, Chengdu Normal University, Chengdu 611130, China;4. College of Information Science and Technology, Chengdu University, Chengdu 610106, China;1. Institut für Physik, Martin-Luther-Universität Halle–Wittenberg, 06099 Halle (Saale), Germany;2. Department of Traffic Engineering, Technische Universität München, München, Germany;3. Sociedad Iberica de Construcciones Electricas, C/Sepulveda 6, 28108 Alcobendas, Madrid, Spain |
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| Abstract: | A two-dimensional square lattice system, on which flexible, chainlike, self-driven objects move randomly but are drifted to a same direction, causing a unidirectional net flow, is investigated by numerical simulations. It is shown that the objects exhibit a freezing transition from a smoothly flowing state to a completely jammed state, in which the objects become immobile and cannot move anymore. Comparison with the flow of rigid objects shows that this complete jamming (hardening) results from the flexibility (softening) of each self-driven object. This is the first report of the freezing transition of a free transport system (without obstacles) where the net flow is not multidirectional (as in the case of opposing flows or crossing flows) but unidirectional. |
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