Global solutions of a doubly tactic resource consumption model with logistic source

Abstract

We study a doubly tactic resource consumption model \bess \left\{\begin{array}{lll} u_t=\tr u-\nabla\cd(u\nabla w),\\[1mm] v_t=\tr v-\nabla\cd(v\nabla u)+v(1-v^{\beta-1}),\\[1mm] w_t=\tr w-(u+v)w-w+r \end{array}\right. \eess in a smooth bounded domain $\oo\in\R^2$ with homogeneous Neumann boundary conditions, where $r\in C^1(\bar\Omega\times[0,\infty))\cap L^\infty(\Omega\times(0,\infty))$ is a given nonnegative function fulfilling \bess \int_t^{t+1}\ii|\nn\sqrt{r}|^2<\yy\ \ \ \ \ \ for\ all\ t>0. \eess It is shown that, firstly, if $\beta>2$, then the corresponding Neumann initial-boundary problem admits a global bounded classical solution. Secondly, when $\beta=2$, the Neumann initial-boundary problem admits a global generalized solution.