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arXiv 2107.01764math.AP
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具有退化扩散和非局部非线性源的Cauchy问题

On the cauchy problem with degenerate diffusion and nonlocal nonlinear sources

Shen Bian

摘要:

本文研究一类具有多孔介质的非线性扩散和非线性非局部反应的广义抛物型方程的非负解。我们调查在什么条件下两个竞争的影响,排斥模型的非线性扩散和聚集模型的非线性反应之间的平衡,发生。精确地说,我们证明了解的定性行为是由非线性扩散决定的,选择非线性扩散的尺度与反应项一致,即存在一个临界指数$m+2/n$,反应指数$α,$解存在全局一致上界的情况下(i)$1\le α<m+2/n$对任何初始数据,(ii)用于小初始数据的$α>m+2/n$和(iii)用于小质量容量$M_0$的$α=m+2/n$。在(ii)和(iii)的情况下,还讨论了解的衰减性质。此外,进行了数值模拟,以验证理论分析,并探讨其他问题,在于分析范围之外。

英文摘要:

This paper is devoted to the analysis of non-negative solutions for a generalisation of the parabolic equation with porous medium like nonlinear diffusion and nonlinear nonlocal reaction. We investigate under which conditions equilibration between two competing effects, repulsion modelled by nonlinear diffusion and aggregation modelled by nonlinear reaction, occurs. Precisely, we exhibit that the qualitative behavior of solutions is decided by the nonlinear diffusion which is chosen in such a way that its scaling and the reaction term coincide, i.e. that there is a critical exponent $m+2/n$ for the reaction exponent $α,$ solutions exist globally with uniformly upper bounds in the case of (i)$1\le α<m+2/n$ for any initial data, (ii) $α>m+2/n$ for small initial data and (iii) $α=m+2/n$ for small mass capacity $M_0$. In the case of (ii) and (iii), the decay properties of the solution are also discussed. Moreover, numerical simulations are carried out to verify the theoretical analysis and explore other issues that lie beyond the scope of the analysis.

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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