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Asymptotic dynamics on a chemotaxis-Navier–Stokes system with nonlinear diffusion and inhomogeneous boundary conditions

    https://doi.org/10.1142/S0218202520500244Cited by:23 (Source: Crossref)

    The diffusion of cells in a viscous incompressible fluid (e.g. water) may be viewed like movement in a porous medium and there is a bidirectorial oxygen exchange between water and their surrounding air in thin fluid layers near the air–water contact surface. This leads to the following chemotaxis-Navier–Stokes system with nonlinear diffusion:

    {nt+un=Δnm(nc),xΩ, t>0,ct+uc=Δcnc,xΩ, t>0,ut+(u)u=Δu+P+nϕ,xΩ, t>0,u=0,xΩ, t>0,
    endowed with the inhomogeneous boundary conditions
    nmν=ncν,cν+a1(x)c=a2(x,t),u=0,xΩ,t>0,
    and the initial data (n,c,u)(0)=(n0,c0,u0) in Ω, where the incoming oxygen a2 is non-negative, and the outgoing oxygen molecule is modeled by a1c with positive coefficient a1. In this paper, we investigate the asymptotic dynamics of the above system in a bounded domain Ω2 with the smooth boundary Ω. We will show that arbitrary porous medium diffusion mechanism (m>1) can inhibit the singularity formation. In the incoming oxygen-free case, we further prove that the solution will stabilize to the unique mass-preserving spatial equilibrium (¯n0,0,0) in the sense that as t,
    n(,t)¯n0,c(,t)0,andu(,t)0
    hold uniformly with respect to xΩ, where ¯n0=1|Ω|Ωn0.

    Communicated by M. Winkler

    AMSC: 35K55, 35Q92, 35Q35, 92C17