CHAOTIC DYNAMICS IN A SLOWLY ROTATING DRUM.
Recent computational work (Banigan et al., Nat. Phys. 9, 288 (2013)) has demonstrated that jamming and unjamming in a shear cell can be described in terms of chaotic dynamics. Experimental work (Wang etal., Sci. Rep. 5, 8128 (2015)) found that avalanches in a rotating drum behave consistently with t...
| Publicado en: | Revista Cubana de Física Vol. 33; no. 1; pp. 50 - 55 |
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| Autores principales: | , |
| Formato: | Artículo |
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Universidad de La Habana
July2016
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=lth&AN=123688748&site=ehost-live header: @attributes: shortDbName: lth uiTerm: 123688748 longDbName: MedicLatina uiTag: AN controlInfo: bkinfo: jinfo: jid: 02539268 UEW jtl: Revista Cubana de Física issn: 02539268 maglogo: N pubinfo: dt: July2016 vid: 33 iid: 1 pid: 21208 pub: Universidad de La Habana artinfo: ui: 123688748 ppf: 50 ppct: 5 formats: fmt: @attributes: type: P size: 1.7MB tig: atl: CHAOTIC DYNAMICS IN A SLOWLY ROTATING DRUM. aug: au: MAGHSOODI, H. LULJTEN, E. affil: Graduate Program in Applied Physics, Northwestern University, Evanston, Illinois 60208, U.S.A Departments of Materials Science & Engineering, Applied Mathematics and Physics & Astronomy, Northwestern University, Evanston, Illinois 60208, U.S.A su: Chaos theory Granular flow Mixing Nonlinear dynamical systems Avalanches sug: subj: Chaos theory Granular flow Mixing Nonlinear dynamical systems Avalanches ab: Recent computational work (Banigan et al., Nat. Phys. 9, 288 (2013)) has demonstrated that jamming and unjamming in a shear cell can be described in terms of chaotic dynamics. Experimental work (Wang etal., Sci. Rep. 5, 8128 (2015)) found that avalanches in a rotating drum behave consistently with this description. We employ computer simulations to examine the chaotic dynamics accompanying granular avalanches in the rotating-drum system. These simulations directly evolve imposed perturbations and provide access to the largest short-time Lyapunov exponent. We find that the local chaotic properties of the system and its dynamics are indeed coupled; the system becomes chaotic as avalanches develop, and returns to a non-chaotic state as avalanches decay. Interestingly, the transition between chaotic and non-chaotic regimes lags behind the change in avalanche state. This contrasts with prior work on the shear cell, where the same force model yielded dynamics that becomes chaotic leading up to, rather than lagging behind, local reorganizations of disks. Trabajo computacional reciente (Banigan y col., Nat. Phys. 9, 288 (2013)) ha demostrado que el "jamming" y "unjamming" en una celda de cizalladura puede ser descrito en términos de dinámica caótica. Se ha encontrado experimentalmente (Wang y col.,Sci. Rep. 5, 8128 (2015)) que las avalanchas en un tabor rotatorio se comportan consistentemente con esta descripción. Utilizamos simulaciones computacionales para examinar la dinámica caótica que acompaña a las avalanchas granulares en el sistema de tambor rotatorio. Estas simulaciones involucran directamente perturbaciones impuestas, y permiten acceder al exponente más grande de Lyapunov de corto tiempo. Encontramos que las propiedades caóticas locales del sistema y su dinámica están, de hecho, acopladas; el sistema se vuelve caótico cuando se desarrollan las avalanchas, y retorna al estado no-caótico cuando éstas disminuyen. Resulta interesante que la transición entre los regímenes caótico y no-caótico va detrás del cambio del régimen de avalanchas. Esto contrasta con trabajos previos en la celda de cizalladura, donde el mismo modelo de fuerza resulta en una dinámica caotica que conduce, en vez de ser el resultado, a reorganizaciones locales de los discos. pubtype: Academic Journal doctype: Article src: R language: English refInfo: copyright: @attributes: flag: Y custom: Copyright of Revista Cubana de Física is the property of Universidad de La Habana and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. item: Revista Cubana de Física holder: Universidad de La Habana dt: @attributes: year: 2016 holdings: @attributes: islocal: N |
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