arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2507.02497math.AP
收藏

二维压缩流体纳维-斯托克斯方程的柯西问题的全球存在性及不可压缩极限

Global Existence and Incompressible Limit of the Cauchy Problem for 2D Compressible Navier-Stokes Equations with Large Bulk Viscosity and Large Initial Data

University of Chinese Academy of Sciences(中国科学院大学);Institute of Applied Mathematics, Academy of Mathematics and Systems Science, Chinese Academy of Sciences(中国科学院数学与系统科学研究院应用数学研究所)

Qinghao Lei, Chengfeng Xiong

AI总结:

本文研究了二维压缩纳维-斯托克斯方程的柯西问题,证明了在大体积粘性系数下弱解、强解和经典解的全球存在性,并展示了当体积粘性系数趋于无穷大时解的不可压缩极限。

摘要:

本文研究了二维压缩纳维-斯托克斯方程在实数空间R²中的柯西问题,其中常态作为远场,可能是真空或非真空。在假设足够大的体积粘性系数的条件下,我们建立了弱解、强解和经典解的全球存在性和长时间行为。值得注意的是,这一结果不依赖于初始数据大小的任何限制。此外,我们证明当体积粘性系数趋于无穷大时,压缩纳维-斯托克斯方程的解收敛到非均匀不可压缩纳维-斯托克斯方程的解。即使不要求初始速度为无散度,弱解的不可压缩极限也成立。

英文摘要:

This paper investigates the Cauchy problem for the barotropic compressible Navier-Stokes equations in $\mathbb{R}^2$ with the constant state as far field, which may be vacuum or non-vacuum. Under the assumption of a sufficiently large bulk viscosity coefficient, we establish the global existence and large time behavior of weak, strong, and classical solutions. It should be mentioned that this result is obtained without any restrictions on the size of the initial data. Moreover, we demonstrate that as the bulk viscosity coefficient tends to infinity, the solutions of the compressible Navier-Stokes equations converge to those of the inhomogeneous incompressible Navier-Stokes equations. The incompressible limit of the weak solutions holds even without requiring the initial velocity to be divergence-free.

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。

↑