On power law scaling dynamics for time-fractional phase field models during coarsening

On power law scaling dynamics for time-fractional phase field models during coarsening
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粗化期间时间分数相场模型的幂律标度动力学

DOI:
10.1016/j.cnsns.2018.10.019
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发表时间:
2018-03
影响因子:
3.9
通讯作者:
Wang Hong
Wang Hong
中科院分区:
数学2区
文献类型:
--
作者:
Zhao Jia;Chen Lizhen;Wang Hong

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本文研究了时间分数相位场模型的能量标度行为。我们报告了一个开创性的观察,时间分数相场模型的有效自由能服从一般的幂律标度动力学粗化。主要地,时间分数相位场模型中的有效自由能和粗糙度通过遵循与整数相位场模型类似的幂律来缩放,其中幂与分数阶成线性比例。这种一般的标度律进行了验证,对几类相场模型,包括Cahn-Hilliard方程与不同类型的可变迁移率和分子束外延模型的数值。这一新发现为时间分数相场模型在异常粗化动力学研究中的应用开辟了新的途径。
In this paper, the energy scaling behavior of the time-fractional phase field models is investigated. We report a seminal observation that the effective free energy of the time-fractional phase field models obeys a general power-law scaling dynamics during coarsening. Mainly, the effective free energy and roughness in the time-fractional phase field models scale by following a similar power law as the integer phase field models, where the power is linearly proportional to the fractional order. This general scaling law is verified numerically against several classes of phase field models, including the Cahn–Hilliard equation with different types of variable mobilities and the molecular beam epitaxy models. This new finding opens potential paths of applying time-fractional phase field models in studying anomalous coarsening dynamics.
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