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arXiv 1107.3950math.AP
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Caginalp相场系统推广的可解性和渐近分析

Solvability and asymptotic analysis of a generalization of the Caginalp phase field system

Giacomo Canevari, Pierluigi Colli

摘要:

本文研究一个相场型扩散模型,它由两个以热位移(基本上是温度的时间积分)和序参量为变量的偏微分方程组成。我们的分析涵盖了一个非光滑(最大单调)的情况下,随着一个光滑的反单调函数的相位方程图。因此,该系统变成了一个推广的著名的Caginalp相场模型的相变时,包括一个扩散项的热位移的平衡方程。米兰维尔和金塔尼利亚对这类系统进行了广泛的研究。我们证明了初边值问题的弱解的存在性和唯一性,以及各种正则性结果,确保该解是强的,有界的组件。然后,我们调查的热位移的扩散项的系数趋于0的解决方案的渐近行为,并证明收敛到Caginalp相场系统以及误差估计的差异的解决方案。

英文摘要:

We study a diffusion model of phase field type, which consists of a system of two partial differential equations involving as variables the thermal displacement, that is basically the time integration of temperature, and the order parameter. Our analysis covers the case of a non-smooth (maximal monotone) graph along with a smooth anti-monotone function in the phase equation. Thus, the system turns out a generalization of the well-known Caginalp phase field model for phase transitions when including a diffusive term for the thermal displacement in the balance equation. Systems of this kind have been extensively studied by Miranville and Quintanilla. We prove existence and uniqueness of a weak solution to the initial-boundary value problem, as well as various regularity results ensuring that the solution is strong and with bounded components. Then we investigate the asymptotic behaviour of the solutions as the coefficient of the diffusive term for the thermal displacement tends to 0 and prove convergence to the Caginalp phase field system as well as error estimates for the difference of the solutions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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