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arXiv math/0701216math.APmath-phmath.MP
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粘性依赖于密度的球对称Navier-斯托克斯方程的整体性态

Global Behavior of Spherically Symmetric Navier-Stokes Equations with Density-Dependent Viscosity

Ting Zhang, Daoyuan Fang

摘要:

本文研究了无固体核的可压缩球对称Navier-斯托克斯方程的自由边界问题。在对初值作一定的假设下,得到了该方程的弱解的整体存在唯一性,给出了解的一致上界(关于时间),并证明了当时间趋于无穷大时,解收敛于平稳解.此外,通过构造一些李雅普诺夫泛函,得到了解的指数型$L^\infty$ -模和加权$H^1$ -模镇定率估计.结果表明,该系统在小扰动下是稳定的,可以应用于天体物理中。

英文摘要:

In this paper, we study a free boundary problem for compressible spherically symmetric Navier-Stokes equations without a solid core. Under certain assumptions imposed on the initial data, we obtain the global existence and uniqueness of the weak solution, give some uniform bounds (with respect to time) of the solution and show that it converges to a stationary one as time tends to infinity. Moreover, we obtain the stabilization rate estimates of exponential type in $L^\infty$-norm and weighted $H^1$-norm of the solution by constructing some Lyapunov functionals. The results show that such system is stable under the small perturbations, and could be applied to the astrophysics.

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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