Diffusion Monte Carlo (DMC) is a random walk computational method for solving the ground-state Schrodinger equation for atoms or molecules. One obtains a biased simulated energy which is used to estimate the exact energy, where the bias increases with the time step used in the simulation. We present
Monte carlo simulation in diffusion studies: Time scale problems
β Scribed by Y. Limoge; J.L. Bocquet
- Publisher
- Elsevier Science
- Year
- 1988
- Weight
- 736 KB
- Volume
- 36
- Category
- Article
- ISSN
- 0001-6160
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β¦ Synopsis
In its original form the Manta Carlo technique was devised in order to handle with stationary states. The proper introduction of the time variable in the Monte Carlo scheme in order to use it in the framework of diffusion studies, is the purpose of this article. With reference to the jump theory we analyze the meaning of the various Monte Carlo schemes which have been used and we propose different algorithm of increasing efficiency which enable us to solve problems of diffusion in disordered media. R&m&--La mkthode de siznuiation num&ique dite de Monte Carlo est devenrte d"un usage asset &kquent dans Ies ktudes de diffusion. Cependant ~~jntr~~~on d'une ~robl~at~que dynamique dam une methode 5 l'origine pr&vue pour traiter d'etats stationnaires nest pas sans poser des questions parfois dehcates. Dam cet articfe nous analysons les precautions 5 prendre pour introduire fa variabte temps et proposons divers schernas d'etTicaeite croissante qui permettent de cafcufer des coefScients de diffusion dans des miheux desordonnis. Zuaanmtenfassung-Die Technick der Monte Carlo-Simulationen is jetzt Xtest in den Diffusionenstudien gebraucht. Aber, da die Monte Carlo-Rechnungen die Physikalische &it umpriiglich nicht kennen, erfijrdem die Studien der Diffusionkonstanten, als fiir anderen kinetischen Grossen, besondere Erorterungen. In diesen Artikel wird diese Frage aufgelost und also werden verxhiedene Rechnungsmodellen die eine wachsende Wirkungskraft zeigen vorgeschagen.
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Implicit Monte Carlo (IMC) is often employed to numerically simulate radiative transfer. In problems with regions that are characterized by a small mean free path, IMC can take a prohibitive amount of time, because many particle steps must be simulated to advance the particle through the time step.
The joint migration of vacancy-impurity-pairs (VIPs) in dilute metallic alloys has been used in a previous publication to explain void formation resistance in electromigration experiments for certain material combinations. A corresponding rule is based on the valency of matrix and alloying elements.