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arXiv 1904.08309math.APmath.DS
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星形图上的对流扩散模型

A Convection-Diffusion model on a star shaped graph

Cristian M. Cazacu, Liviu I. Ignat, Ademir F. Pazoto, Julio D. Rossi

摘要:

本文研究了由$n$输入边和$m$输出边组成的星形图上的对流扩散方程,其中非线性项$f\in C^1(\rr)$满足一些附加的一般条件.首先,我们证明了所考虑的系统的解决方案的整体适定性。其次,在非线性对流方程由$\partial_x(f(u(t, x))$和$f(s)=-a|s|^{q-1}s$,$q\geq 2$和$a\in \rr$验证$(n-m)a\geq 0$给出的特殊情况下,我们分析了解的长时间行为。对于$q> 2$,我们发现解的渐近行为是由热方程在所考虑的结构上的一些自相似轮廓给出的。在$q=2$情形下,非负/非正解收敛于Burgers方程的自相似轮廓.得到了极限轮廓的显式表达式。

英文摘要:

In this paper we study a convection-diffusion equation on a star-shaped graph composed by $n$ incoming edges and $m$ outgoing edges with a nonlinearity $f\in C^1(\rr)$ satisfying some additional general conditions. First, we prove the global well-posedness of the solutions of the system under consideration. Next, in the particular case that the nonlinear convection is given by $\partial_x(f(u(t, x))$ with $f(s)=-a|s|^{q-1}s$ with $q\geq 2$ and $a\in \rr$ verifying $(n-m)a\geq 0$, we analyze the long time behavior of the solutions. For $q> 2$ we find that the asymptotic behavior of the solutions is given by some self-similar profiles of the heat equation on the considered structure. In the case $q=2$, the nonnegative/nonpositive solutions converge to the self-similar profiles of Burgers' equation. Explicit representations of the limit profiles are obtained.

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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