Influence of flux limitation on large time behavior in a three-dimensional chemotaxis-Stokes system modeling coral fertilization (2102.12253v1)

Abstract: In this paper, we consider the following system $$\left{\begin{array}{ll} n_t+u\cdot\nabla n&=\Delta n-\nabla\cdot(n\mathcal{S}(|\nabla c|^2)\nabla c)-nm,\ c_t+u\cdot\nabla c&=\Delta c-c+m,\ m_t+u\cdot\nabla m&=\Delta m-mn,\ u_t&=\Delta u+\nabla P+(n+m)\nabla\Phi,\qquad \nabla\cdot u=0 \end{array}\right.$$ which models the process of coral fertilization, in a smoothly three-dimensional bounded domain, where $\mathcal{S}$ is a given function fulfilling $$|\mathcal{S}(\sigma)|\leq K_{\mathcal{S}}(1+\sigma)^{-\frac{\theta}{2}},\qquad \sigma\geq 0$$ with some $K_{\mathcal{S}}>0.$ Based on conditional estimates of the quantity $c$ and the gradients thereof, a relatively compressed argument as compared to that proceeding in related precedents shows that if $$\theta>0,$$ then for any initial data with proper regularity an associated initial-boundary problem under no-flux/no-flux/no-flux/Dirichlet boundary conditions admits a unique classical solution which is globally bounded, and which also enjoys the stabilization features in the sense that $$|n(\cdot,t)-n_{\infty}|{L^{\infty}(\Omega)}+|c(\cdot,t)-m{\infty}|{W^{1,\infty}(\Omega)} +|m(\cdot,t)-m{\infty}|{W^{1,\infty}(\Omega)}+|u(\cdot,t)|{L^{\infty}(\Omega)}\rightarrow0 \quad\textrm{as}~t\rightarrow \infty$$ with $n_{\infty}:=\frac{1}{|\Omega|}\left{\int_{\Omega}n_0-\int_{\Omega}m_0\right}{+}$ and $m{\infty}:=\frac{1}{|\Omega|}\left{\int_{\Omega}m_0-\int_{\Omega}n_0\right}_{+}.$