Acta mathematica scientia,Series A ›› 2023, Vol. 43 ›› Issue (5): 2089-2107.doi: 10.1007/s10473-023-0510-z

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GLOBAL WEAK SOLUTIONS TO A THREE-DIMENSIONAL QUANTUM KINETIC-FLUID MODEL*

Fucai Li1, Yue Li1,†, Baoyan Sun2   

  1. 1. Department of Mathematics, Nanjing University, Nanjing 210093, China;
    2. School of Mathematics and Information Sciences, Yantai University, Yantai 264005, China
  • Received:2022-02-14 Revised:2023-04-30 Online:2023-10-26 Published:2023-10-25
  • Contact: †Yue Li, E-mail: liyue2011008@163.com
  • About author:Fucai Li, E-mail: fli@nju.edu.cn; Baoyan Sun, E-mail: bysun@ytu.edu.cn
  • Supported by:
    Li’s research were supported by the NSFC (12071212). And F. Li’s research was also supported by a project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions. B. Sun’s research was supported by NSFC (12171415) and the Scientific Research Foundation of Yantai University (2219008).

Abstract: In this paper, we study a quantum kinetic-fluid model in a three-dimensional torus. This model is a coupling of the Vlasov-Fokker-Planck equation and the compressible quantum Navier-Stokes equations with degenerate viscosity. We establish a global weak solution to this model for arbitrarily large initial data when the pressure takes the form $ p(\rho)=\rho^\gamma+p_c(\rho)$, where $\gamma>1$ is the adiabatic coefficient and $p_c(\rho)$ satisfies \begin{equation*} p_c(\rho)=\left\{ \begin{array}{ll}-c\rho^{-4k}\; \;\;\;&{\rm{if}}\;\;\rho\leq 1, \\ \rho^{\gamma}\;\;\;\;&{\rm{if}}\;\;\rho>1 \end{array} \right. \end{equation*} for $k\geq 4$ and some constant $c>0$.

Key words: kinetic-fluid model, quantum Bohm potential, density-dependent viscosity, weak solutions

CLC Number: 

  • 35Q35
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