Acta mathematica scientia,Series B ›› 2024, Vol. 44 ›› Issue (1): 195-214.doi: 10.1007/s10473-024-0111-5

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GLOBAL SOLUTIONS TO 1D COMPRESSIBLE NAVIER-STOKES/ALLEN-CAHN SYSTEM WITH DENSITY-DEPENDENT VISCOSITY AND FREE-BOUNDARY*

Shijin Ding, Yinghua Li, Yu Wang   

  1. School of Mathematical Sciences, South China Normal University, Guangzhou 510631, China
  • Received:2022-09-23 Revised:2023-06-16 Online:2024-02-25 Published:2024-02-27
  • Contact: † Yinghua Li,E-mail:yinghua@scnu.edu.cn
  • About author:Shijin Ding, E-mail: dingsj@scnu.edu.cn; Yu Wang, E-mail: yuwang@m.scnu.edu.cn
  • Supported by:
    Ding's research was supported by the Key Project of the NSFC (12131010), the NSFC (11771155, 12271032) and the NSF of Guangdong Province (2021A1515010249, 2021A1515010303). Li's research was supported by the NSFC (11971179, 12371205).

Abstract: This paper is concerned with the Navier-Stokes/Allen-Cahn system, which is used to model the dynamics of immiscible two-phase flows. We consider a 1D free boundary problem and assume that the viscosity coefficient depends on the density in the form of $\eta(\rho)=\rho^\alpha$. The existence of unique global $H^{2m}$-solutions $(m\in\mathbb N)$ to the free boundary problem is proven for when $0<\alpha<\frac14$. Furthermore, we obtain the global $C^\infty$-solutions if the initial data is smooth.

Key words: Navier-Stokes/Allen-Cahn system, density-dependent viscosity, free boundary, global solutions

CLC Number: 

  • 35A02
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