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arXiv 2610.13618math.AP
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具有大初值和真空的有界域中二维可压缩Navier-Stokes-Poisson系统的强解与弱解的整体存在性

Global Existence of Strong and Weak Solutions to the 2D Compressible Navier-Stokes-Poisson System in Bounded Domains with Large Data and Vacuum

School of Mathematics and Statistics, Wuhan University(武汉大学数学与统计学院)

Yingzhi Du, Huijiang Zhao

AI总结:

针对有大初值和真空的二维可压缩Navier-Stokes-Poisson系统,引入修正物质导数等方法,建立其强解与弱解的整体存在性。

摘要:

我们研究二维可压缩Navier-Stokes-Poisson系统,该系统定义在一般单连通有界域中,带有Navier滑移边界条件和正的、可能非平坦的掺杂分布。当剪切黏度为正常数,且体黏度与密度的某一幂次成正比(该幂次大于4/3)时,我们针对任意大的允许真空的初始数据,建立了唯一强解和整体弱解的存在性。主要困难源于泊松力与一般边界几何之间的相互作用。为克服这些困难,我们引入修正的物质导数,并结合Neumann对偶论证与Navier滑移边界条件产生的调和校正,推导密度的定量L^p估计。我们还通过共形映射将单位圆盘上的Neumann格林函数拉回,得到有效黏性通量的逐点表示。所得的交换子估计结合泊松方程的椭圆估计,给出密度的时间一致上界,使我们能够完成高阶先验估计。最后,通过保荷近似和紧性论证构造整体弱解。

英文摘要:

We study the two-dimensional compressible Navier-Stokes-Poisson system in a general simply connected bounded domain with Navier-slip boundary conditions and a positive, possibly non-flat, doping profile. We establish the global existence of a unique strong solution and of a global weak solution for arbitrarily large initial data allowing vacuum when the shear viscosity is a positive constant and the bulk one proportional to a power of the density with the power bigger than 4/3. The main difficulties arise from the interaction between the Poisson force and the general boundary geometry. To overcome them, we introduce a modified material derivative and derive quantitative $L^p$ estimates for the density by means of a Neumann duality argument together with a harmonic correction generated by the Navier-slip boundary condition. We further obtain a pointwise representation of the effective viscous flux by pulling back the Neumann Green function on the unit disk through a conformal mapping. The resulting commutator estimates, combined with elliptic estimates for the Poisson equation, yield a uniform-in-time upper bound for the density and allow us to close the higher-order a priori estimates. Finally, the global weak solution is constructed through a charge-preserving approximation and compactness argument.

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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