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arXiv 0812.1627math.AP
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粘性标量守恒律的长时间行为

Long time behaviour of viscous scalar conservation laws

Anne-Laure Dalibard

摘要:

本文研究守恒律$\partial_t u + \mathrm{div}_y A(y,u) -Δ_y u=0$定常解的稳定性,其中通量$A$关于其第一变量是周期的.本文主要研究了两种渐近行为:当方程被置于$\R$上时的情形和当方程被赋予周期边界条件时的情形。在整个空间的情况下,我们首先证明了粘性定常激波的存在性-也称为驻波激波-它将两个不同的周期定常解相互连接起来。我们证明了在$L^1$中,只要初始扰动满足适当的有界性条件,驻波是稳定的。我们也将这个结果推广到任意的初始数据,但对流量$A$有一些限制。在周期情况下,我们证明了周期平稳解总是稳定的。这一结果的证明依赖于推导统一的$L^\infty$界的解决方案的守恒律,并在子和超级解决方案的技术。

英文摘要:

This paper is concerned with the stability of stationary solutions of the conservation law $\partial_t u + \mathrm{div}_y A(y,u) -Δ_y u=0$, where the flux $A$ is periodic with respect to its first variable. Essentially two kinds of asymptotic behaviours are studied here: the case when the equation is set on $\R$, and the case when it is endowed with periodic boundary conditions. In the whole space case, we first prove the existence of viscous stationary shocks - also called standing shocks - which connect two different periodic stationary solutions to one another. We prove that standing shocks are stable in $L^1$, provided the initial disturbance satisfies some appropriate boundedness conditions. We also extend this result to arbitrary initial data, but with some restrictions on the flux $A$. In the periodic case, we prove that periodic stationary solutions are always stable. The proof of this result relies on the derivation of uniform $L^\infty$ bounds on the solution of the conservation law, and on sub- and super-solution techniques.

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