| HAL : hal-00680278, version 1 |
| arXiv : 1203.3773 |
| Fiche détaillée | Récupérer au format |
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| Derivation of Langevin Dynamics in a nonzero Background Flow Field |
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| Matthew Dobson 1, 2Frédéric Legoll 2, 3 |
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| MICMAC; CERMICS Collaboration(s) |
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| (16/03/2012) |
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| We propose a derivation of a nonequilibrium Langevin dynamics for a large particle immersed in a background flow field. A single large particle is placed in an ideal gas heat bath composed of point particles that are distributed consistently with the background flow field and that interact with the large particle through elastic collisions. In the limit of small bath atom mass, the large particle dynamics converges in law to a stochastic dynamics. This derivation follows the ideas of [D. Dürr, S. Goldstein, and J. L. Lebowitz, 1981 and 1983; P. Calderoni, D. Dürr, and S. Kusuoka, 1989] and provides extensions to handle the nonzero background flow. The derived nonequilibrium Langevin dynamics is similar to the dynamics in [M. McPhie, et al., 2001]. Some numerical experiments illustrate the use of the obtained dynamic to simulate homogeneous liquid materials under flow. |
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| 1 : | Centre d'Enseignement et de Recherche en Mathématiques et Calcul Scientifique (CERMICS) |
| Ecole des Ponts ParisTech | |
| 2 : | MICMAC (INRIA Paris - Rocquencourt) |
| Ecole des Ponts ParisTech – INRIA | |
| 3 : | Laboratoire Navier |
| Ecole des Ponts ParisTech – CNRS : UMR8205 – IFSTTAR | |
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| Multi-échelle |
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| Domaine | : | Physique/Physique mathématique Mathématiques/Physique mathématique |
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| nonequilibrium – Langevin dynamics – multiscale – molecular simulation |
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| Lien vers le texte intégral : |
| hal-00680278, version 1 | |
| http://hal-enpc.archives-ouvertes.fr/hal-00680278 | |
| oai:hal-enpc.archives-ouvertes.fr:hal-00680278 | |
| Contributeur : Matthew Dobson | |
| Soumis le : Lundi 19 Mars 2012, 09:43:19 | |
| Dernière modification le : Mercredi 21 Mars 2012, 13:08:50 | |