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arXiv 2307.16615math.AP
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具有一般外力的时间分数阶 Fokker-Planck 方程弱解的适定性与模拟

Well-posedness and simulation of weak solutions to the time-fractional Fokker-Planck equation with general forcing

Marvin Fritz

AI总结:

本文研究了时间分数阶 Fokker-Planck 方程在一般外力下弱解的适定性,通过非标准测试方法导出能量不等式并结合 Henry-Gronwall 型不等式完成估计,同时提出非均匀 L1 格式数值算法进行模拟。

摘要:

本文研究了时间分数阶 Fokker-Planck 方程弱解的适定性。其动力学由反常扩散主导,我们考虑了时空相关力的最一般情形。因此,分数阶导数出现在方程右侧,无法移至从分析角度更理想的左侧。为证明模型的适定性,我们通过涉及一系列卷积和积分的非标准新颖测试方法导出了能量不等式。最后,我们利用 Henry-Gronwall 型不等式完成估计。最后,我们提出了一种基于非均匀 L1 格式的数值算法,并给出了针对不同力的模拟结果。

英文摘要:

In this paper, we investigate the well-posedness of weak solutions to the time-fractional Fokker-Planck equation. Its dynamics is governed by anomalous diffusion, and we consider the most general case of space-time dependent forces. Consequently, the fractional derivatives appear on the right-hand side of the equation, and they cannot be brought to the left-hand side, which would have been preferable from an analytical perspective. For showing the model's well-posedness, we derive an energy inequality by considering nonstandard and novel testing methods that involve a series of convolutions and integrations. We close the estimate by a Henry-Gronwall-type inequality. Lastly, we propose a numerical algorithm based on a nonuniform L1 scheme and present some simulation results for various forces.

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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