Boundedness and finite-time blow-up in a repulsion-consumption system with flux limitation

Abstract

We investigate the following repulsion-consumption system with flux limitation \begin{align}\tag{$\star$} \left\{ \begin{array}{ll} u_t=Δu+\nabla \cdot(uf(|\nabla v|^2) \nabla v), & x \in Ω, t>0, τv_t=Δv-u v, & x \in Ω, t>0, \end{array} \right. \end{align} under no-flux/Dirichlet boundary conditions, where $\Omega \subset {\mathbb{R}}^n$ is a bounded domain and $f(\xi )$ generalizes the prototype given by $f(\xi )=(1+\xi {)}^{-\alpha }$ ($\xi ⩾0$). We are mainly concerned with the global existence and finite time blow-up of system ($\star$). The main results assert that, for $\alpha >\frac{n-2}{2n}$, then when $\tau =1$ and under radial settings, or when $\tau =0$ without radial assumptions, for arbitrary initial data, the problem ($\star$) possesses global bounded classical solutions; for $\alpha <0$, $\tau =0$, $n=2$ and under radial settings, for any initial data, whenever the boundary signal level large enough, the solutions of the corresponding problem blow up in finite time. Our results can be compared respectively with the blow-up phenomenon obtained by Ahn \& Winkler (2023) for the system with nonlinear diffusion and linear chemotactic sensitivity, and by Wang \& Winkler (2023) for the system with nonlinear diffusion and singular sensitivity .

arXiv admin note: text overlap with arXiv:2409.01853