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arXiv 1109.0871math.APmath-phmath.MP
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粘性依赖于密度的一维可压缩Navier-斯托克斯方程稀疏波周围的真空行为

Vacuum behaviors around rarefaction waves to 1D compressible Navier-Stokes equations with density-dependent viscosity

Quansen Jiu, Yi Wang, Zhouping Xin

摘要:

本文研究了粘性依赖于密度的一维可压缩Navier-斯托克斯方程解的稀疏波大时间渐近性态,其初值为远场通过稀疏波与相应的一端为真空的Euler方程相连接的一般初值。首先,通过对系统进行近似,并对初值进行一般摄动正则化,构造了稀疏波附近的时间上全局弱解,得到了能量和熵的时间上一致的先验估计.然后证明了满足自然能量和熵估计的任意弱解的密度在超范数时间内渐近收敛于与真空相联系的任意强度的稀疏波.我们的结果意味着,特别是,在远场的初始真空将保持所有的时间相比,在\cite{JWX}研究的非真空稀疏波的情况下,所有可能的真空状态将消失在有限的时间。最后证明了远离稀疏波真空区的弱解是正则的。

英文摘要:

In this paper, we study the large time asymptotic behavior toward rarefaction waves for solutions to the 1-dimensional compressible Navier-Stokes equations with density-dependent viscosities for general initial data whose far fields are connected by a rarefaction wave to the corresponding Euler equations with one end state being vacuum. First, a global-in-time weak solution around the rarefaction wave is constructed by approximating the system and regularizing the initial data with general perturbations, and some a priori uniform-in-time estimates for the energy and entropy are obtained. Then it is shown that the density of any weak solution satisfying the natural energy and entropy estimates will converge to the rarefaction wave connected to vacuum with arbitrary strength in super-norm time-asymptotically. Our results imply, in particular, that the initial vacuum at far fields will remain for all the time which are in contrast to the case of non-vacuum rarefaction waves studied in \cite{JWX} where all the possible vacuum states will vanish in finite time. Finally, it is proved that the weak solution becomes regular away from the vacuum region of the rarefaction wave.

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