Acta mathematica scientia,Series B ›› 2024, Vol. 44 ›› Issue (1): 247-274.doi: 10.1007/s10473-024-0114-2

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INTERFACE BEHAVIOR AND DECAY RATES OF COMPRESSIBLE NAVIER-STOKES SYSTEM WITH DENSITY-DEPENDENT VISCOSITY AND A VACUUM*

Zhenhua Guo1,2, Xueyao Zhang1,†   

  1. 1. School of Mathematics and CNS, Northwest University, Xi'an 710127, China;
    2. School of Mathematics and Information Science, Guangxi University, Nanning 530004, China
  • Received:2022-09-07 Revised:2023-07-22 Online:2024-02-25 Published:2024-02-27
  • Contact: † Xueyao Zhang, E-mail: xyzhang05@163.com
  • About author:Zhenhua Guo, E-mail: zhguo@gxu.edu.cn
  • Supported by:
    NSFC (11931013) and the GXNSF (2022GXNSFDA035078).

Abstract: In this paper, we study the one-dimensional motion of viscous gas near a vacuum, with the gas connecting to a vacuum state with a jump in density. The interface behavior, the pointwise decay rates of the density function and the expanding rates of the interface are obtained with the viscosity coefficient $\mu(\rho)=\rho^{\alpha}$ for any $0<\alpha<1$; this includes the time-weighted boundedness from below and above. The smoothness of the solution is discussed. Moreover, we construct a class of self-similar classical solutions which exhibit some interesting properties, such as optimal estimates. The present paper extends the results in [Luo T, Xin Z P, Yang T. SIAM J Math Anal, 2000, 31(6): 1175-1191] to the jump boundary conditions case with density-dependent viscosity

Key words: decay rates, interface, Navier-Stokes equations, vacuum

CLC Number: 

  • 35Q30
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