Global weak solutions for the three-dimensional chemotaxis-Navier-Stokes system with nonlinear diffusion

We consider an initial-boundary value problem for the incompressible chemotaxis-Navier-Stokes equations generalizing the porous-medium-type diffusion model $\quad n_t+u\cdot\nabla n=Δn^m-\nabla\cdot(nχ(c)\nabla c),$ $\quad c_t+u\cdot\nabla c=Δc-nf(c),$ $\quad u_t+κ(u\cdot\nabla)u=Δu+\nabla P+n\nablaΦ,$ $\quad \nabla\cdot u=0,$ in a bounded convex domain $Ω\subset\mathbb{R}^3$. It is proved that if $m\geq\frac{2}{3}$, $κ\in\mathbb{R}$, $0<χ\in C^2([0,\infty))$, $0\leq f\in C^1([0,\infty))$ with $f(0)=0$ and $Φ\in W^{1,\infty}(Ω)$, then for sufficiently smooth initial data $(n_0, c_0, u_0)$ the model possesses at least one global weak solution.

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