a paradox of decreasing entropy in multiscale monte carlo grain growth simulations一个悖论多尺度熵减少的蒙特卡罗模拟晶粒生长.pdfVIP

a paradox of decreasing entropy in multiscale monte carlo grain growth simulations一个悖论多尺度熵减少的蒙特卡罗模拟晶粒生长.pdf

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a paradox of decreasing entropy in multiscale monte carlo grain growth simulations一个悖论多尺度熵减少的蒙特卡罗模拟晶粒生长

Entropy 2008, 10, 49-54; DOI: 10.3390/entropy- OPEN ACCESS entropy ISSN 1099-4300 /entropy Short Note A Paradox of Decreasing Entropy in Multiscale Monte Carlo Grain Growth Simulations Michael Nosonovsky * and Sven K. Esche Department of Mechanical Engineering, Stevens Institute of Technology, Hoboken, NJ 07030, USA * Author to whom correspondence should be addressed; E-mail: Nosonovsky@ Received: 20 March 2008; in revised form: 9 June 2008 / Accepted: 14 June 2008 / Published: 16 June 2008 Abstract: Grain growth in metals is driven by random thermal fluctuations and increases the orderliness of the system. This random process is usually simulated by the Monte Carlo (MC) method and Cellular Automata (CA). The increasing orderliness results in an entropy decrease, thus leading to a paradoxical apparent violation of the second law of thermodynamics. In this paper, it is shown that treating the system as a multiscale system resolves this paradox. MC/CA simulations usually take into consideration only the mesoscale entropy. Therefore, the information entropy of the system decreases, leading to an apparent paradox. However, in the physical system, the entropy is produced at the nanoscale while it is consumed at the mesoscale, so that the net entropy is growing. Keywords: grain growth, Monte Carlo simulation, Cellular Automata, multiscale modeling. The entropy as a measure of

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