数学物理学报(英文版) ›› 2025, Vol. 45 ›› Issue (3): 1045-1062.doi: 10.1007/s10473-025-0316-2

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GLOBAL STRONG SOLUTION OF THE PRESSURELESS NAVIER-STOKES/NAVIER-STOKES SYSTEM

Yue ZHANG1, Minyan YU1,†, Houzhi TANG2   

  1. 1. School of Mathematical Sciences, Capital Normal University, Beijing 100048, China;
    2. School of Mathematics and Statistics, Anhui Normal University, Wuhu 241002, China
  • 收稿日期:2023-11-23 修回日期:2024-05-28 出版日期:2025-05-25 发布日期:2025-09-30

GLOBAL STRONG SOLUTION OF THE PRESSURELESS NAVIER-STOKES/NAVIER-STOKES SYSTEM

Yue ZHANG1, Minyan YU1,†, Houzhi TANG2   

  1. 1. School of Mathematical Sciences, Capital Normal University, Beijing 100048, China;
    2. School of Mathematics and Statistics, Anhui Normal University, Wuhu 241002, China
  • Received:2023-11-23 Revised:2024-05-28 Online:2025-05-25 Published:2025-09-30
  • Contact: Minyan YU, E-mail: ymathmy@126.com
  • About author:Yue ZHANG, E-mail: yuezhangmath@126.com; Houzhi TANG, E-mail: houzhitang@ahnu.edu.cn
  • Supported by:
    National Natural Science Foundation of China (11931010, 12226326, 12226327), and the Key Research Project of Academy for Multidisciplinary Studies, Capital Normal University. The third author was supported by the Anhui Provincial Natural Science Foundation (2408085QA031).

摘要: We consider the Cauchy problem for the three-dimensional pressureless Navier-Stokes/Navier-Stokes system, which consists of the pressureless Navier-Stokes equations for $(n,w)$ coupled with the isentropic compressible Navier-Stokes equations for $(\rho,u)$ through a drag force term $n(w-u)$. We prove the global existence of strong solutions to the coupled system when the initial data are small perturbations of the constant equilibrium state. However, due to the pressureless structure, one can only deal with the density $n$ of the pressureless flow through the transport equation and it is crucial to obtain the exact time-decay rates for the corresponding velocity $w$ of the pressureless flow. To this end, we make use of the spectral analysis, low-high frequency decomposition and time-weighted energy method to deduce the large time behavior of $(w,\rho,u)$ and consequently establish the Lyapunov stability of the density $n$ in Sobolev space.

关键词: pressureless Navier-Stokes/Navier-Stokes system, Cauchy problem, strong solution, global existence

Abstract: We consider the Cauchy problem for the three-dimensional pressureless Navier-Stokes/Navier-Stokes system, which consists of the pressureless Navier-Stokes equations for $(n,w)$ coupled with the isentropic compressible Navier-Stokes equations for $(\rho,u)$ through a drag force term $n(w-u)$. We prove the global existence of strong solutions to the coupled system when the initial data are small perturbations of the constant equilibrium state. However, due to the pressureless structure, one can only deal with the density $n$ of the pressureless flow through the transport equation and it is crucial to obtain the exact time-decay rates for the corresponding velocity $w$ of the pressureless flow. To this end, we make use of the spectral analysis, low-high frequency decomposition and time-weighted energy method to deduce the large time behavior of $(w,\rho,u)$ and consequently establish the Lyapunov stability of the density $n$ in Sobolev space.

Key words: pressureless Navier-Stokes/Navier-Stokes system, Cauchy problem, strong solution, global existence

中图分类号: 

  • 76N10