arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1007.3744math.AP
收藏

关于Muskat问题的整体存在性

On the global existence for the Muskat problem

Peter Constantin, Diego Cordoba, Francisco Gancedo, Robert M. Strain

摘要:

Muskat问题模拟了具有不同恒定密度的两种不可压缩不混溶流体之间的界面的动力学。在这项工作中,我们证明了三个结果。首先,我们证明了一个$L^2(\R)$最大值原理,在一个新的“日志”守恒律\eqref{ln}的形式是满足的方程\eqref{ec1d}的界面。我们的第二个结果是证明了满足$\|f_0\|_{L^\infty}<\infty$和$\|\partial_x f_0\|_{L^\infty}<1$的初始数据的Lipschitz连续解的整体存在性。我们利用的事实,即绑定$\|\partial_x f_0\|_{L^\infty}<1$传播的解决方案,这授予强大的紧凑性相比,日志守恒律。最后,我们证明了唯一强解的整体存在性结果,如果初始数据小于一个显式可计算常数,例如$\| f\|_1 \le 1/5$。以前的这类结果使用了一个小的常数$ε\ll1$,这是不明确的。

英文摘要:

The Muskat problem models the dynamics of the interface between two incompressible immiscible fluids with different constant densities. In this work we prove three results. First we prove an $L^2(\R)$ maximum principle, in the form of a new ``log'' conservation law \eqref{ln} which is satisfied by the equation \eqref{ec1d} for the interface. Our second result is a proof of global existence of Lipschitz continuous solutions for initial data that satisfy $\|f_0\|_{L^\infty}<\infty$ and $\|\partial_x f_0\|_{L^\infty}<1$. We take advantage of the fact that the bound $\|\partial_x f_0\|_{L^\infty}<1$ is propagated by solutions, which grants strong compactness properties in comparison to the log conservation law. Lastly, we prove a global existence result for unique strong solutions if the initial data is smaller than an explicitly computable constant, for instance $\| f\|_1 \le 1/5$. Previous results of this sort used a small constant $ε\ll1$ which was not explicit.

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。

↑