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arXiv 1602.00665math.AP
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具Logistic源的趋化性-流体系统的长期行为

Long-term behaviour in a chemotaxis-fluid system with logistic source

Johannes Lankeit

摘要:

考虑了具有Logistic源项\[ n_t + u\cdot \nabla n = Δn - χ\nabla \cdot (n \nabla c) + κn - μn^2\] \[ c_t + u\cdot \nabla c = Δc - nc\] \[ u_t + (u\cdot \nabla)u = Δu +\nabla P + n\nabla Φ+ f, \quad\qquad \nabla \cdot u=0 \]在有界光滑区域$Ω\subset \mathbb{R}^3$中的耦合趋化性Navier-Stokes模型,对于$n$和$c$满足齐次Neumann边界条件,对于$u$满足齐次Dirichlet边界条件,对于某些$β\in(0,1)$满足$f\in L^\infty(Ω\times(0,\infty))$和$Φ\in C^{1+β}(\barΩ)$.我们构造弱解,并证明经过一段时间的等待,他们变得光滑,并最终收敛到半平凡的稳态$(\fracκμ,0,0)$。关键词:趋化性,Navier-Stokes,Logistic源,有界性,大时间行为

英文摘要:

We consider the coupled chemotaxis Navier-Stokes model with logistic source terms \[ n_t + u\cdot \nabla n = Δn - χ\nabla \cdot (n \nabla c) + κn - μn^2\] \[ c_t + u\cdot \nabla c = Δc - nc\] \[ u_t + (u\cdot \nabla)u = Δu +\nabla P + n\nabla Φ+ f, \quad\qquad \nabla \cdot u=0 \] in a bounded, smooth domain $Ω\subset \mathbb{R}^3$ under homogeneous Neumann boundary conditions for $n$ and $c$ and homogeneous Dirichlet boundary conditions for $u$ and with given functions $f\in L^\infty(Ω\times(0,\infty))$ satisfying certain decay conditions and $Φ\in C^{1+β}(\barΩ)$ for some $β\in(0,1)$. We construct weak solutions and prove that after some waiting time they become smooth and finally converge to the semi-trivial steady state $(\fracκμ,0,0)$. Keywords: chemotaxis, Navier-Stokes, logistic source, boundedness, large-time behaviour

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