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Cooperative dynamics in the penetration of a group of intruders in a granular medium

An object moving in a fluid experiences a drag force that depends on its velocity, shape and the properties of the medium. From this simplest case to the motion of a flock of birds or a school of fish, the drag forces and the hydrodynamic interactions determine the full dynamics of the system. Simil...

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Detalles Bibliográficos
Autores principales: Pacheco-Vázquez, F., Ruiz-Suárez, J.C.
Formato: Texto
Lenguaje:English
Publicado: Nature Publishing Group 2010
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3065908/
https://www.ncbi.nlm.nih.gov/pubmed/21119636
http://dx.doi.org/10.1038/ncomms1123
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author Pacheco-Vázquez, F.
Ruiz-Suárez, J.C.
author_facet Pacheco-Vázquez, F.
Ruiz-Suárez, J.C.
author_sort Pacheco-Vázquez, F.
collection PubMed
description An object moving in a fluid experiences a drag force that depends on its velocity, shape and the properties of the medium. From this simplest case to the motion of a flock of birds or a school of fish, the drag forces and the hydrodynamic interactions determine the full dynamics of the system. Similar drag forces appear when a single projectile impacts and moves through a granular medium, and this case is well studied in the literature. On the other hand, the case in which a group of intruders impact a granular material has never been considered. Here, we study the simultaneous penetration of several intruders in a very low-density granular medium. We find that the intruders move through it in a collective way, following a cooperative dynamics, whose complexity resembles flocking phenomena in living systems or the movement of reptiles in sand, wherein changes in drag are exploited to efficiently move or propel.
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spelling pubmed-30659082011-03-29 Cooperative dynamics in the penetration of a group of intruders in a granular medium Pacheco-Vázquez, F. Ruiz-Suárez, J.C. Nat Commun Article An object moving in a fluid experiences a drag force that depends on its velocity, shape and the properties of the medium. From this simplest case to the motion of a flock of birds or a school of fish, the drag forces and the hydrodynamic interactions determine the full dynamics of the system. Similar drag forces appear when a single projectile impacts and moves through a granular medium, and this case is well studied in the literature. On the other hand, the case in which a group of intruders impact a granular material has never been considered. Here, we study the simultaneous penetration of several intruders in a very low-density granular medium. We find that the intruders move through it in a collective way, following a cooperative dynamics, whose complexity resembles flocking phenomena in living systems or the movement of reptiles in sand, wherein changes in drag are exploited to efficiently move or propel. Nature Publishing Group 2010-11-23 /pmc/articles/PMC3065908/ /pubmed/21119636 http://dx.doi.org/10.1038/ncomms1123 Text en Copyright © 2010, Nature Publishing Group, a division of Macmillan Publishers Limited. All Rights Reserved. http://creativecommons.org/licenses/by-nc-nd/3.0/ This work is licensed under a Creative Commons Attribution-NonCommercial-No Derivative Works 3.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-nd/3.0/
spellingShingle Article
Pacheco-Vázquez, F.
Ruiz-Suárez, J.C.
Cooperative dynamics in the penetration of a group of intruders in a granular medium
title Cooperative dynamics in the penetration of a group of intruders in a granular medium
title_full Cooperative dynamics in the penetration of a group of intruders in a granular medium
title_fullStr Cooperative dynamics in the penetration of a group of intruders in a granular medium
title_full_unstemmed Cooperative dynamics in the penetration of a group of intruders in a granular medium
title_short Cooperative dynamics in the penetration of a group of intruders in a granular medium
title_sort cooperative dynamics in the penetration of a group of intruders in a granular medium
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3065908/
https://www.ncbi.nlm.nih.gov/pubmed/21119636
http://dx.doi.org/10.1038/ncomms1123
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