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arXiv 2103.17199math.AP
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具有任意超线性退化的趋化性-Navier-Stokes方程组的广义解

Generalized solutions to a chemotaxis-Navier-Stokes system with arbitrary superlinear degradation

Mengyao Ding, Johannes Lankeit

摘要:

在这项工作中,我们研究了二维环境中的趋化性-Navier-Stokes模型,\begin{eqnarray} \left\{ \begin{array}{llll} \displaystyle n_{t}+\mathbf{u}\cdot\nabla n=Δn-\nabla \cdot(n\nabla c)+f(n), &&x\inΩ,\,t>0,\\ \displaystyle c_{t}+\mathbf{u}\cdot\nabla c=Δc - c+ n, &&x\inΩ,\,t>0,\\ \displaystyle \mathbf{u}_{t}+κ(\mathbf{u}\cdot\nabla)\mathbf{u}=Δ\mathbf{u} +\nabla P+ n\nablaϕ, &&x\inΩ,\,t>0,\\ \displaystyle \nabla\cdot\mathbf{u}=0,&&x\inΩ,\,t>0.\\ \end{array} \right. \end{eqnarray}受Winkler最近工作的启发,我们的目标是研究模型的广义可解性,而不对Logistic源函数$f$施加临界超线性指数限制。具体地说,它被证明在目前的工作中,存在一个三元组的可积函数$(n,c,\mathbf{u})$解决系统在广义上提供$f\in C^1([0,\infty))$满足$f(0)\ge0$和$f(n)\le rn-μn^γ$($n\ge0$)与任何$γ>1$。我们的结果表明,持久的Dirac-type奇点可以排除在我们的模型在上述温和的假设$f$。在给出系统解的存在性结果后,我们还证明了只要$μ/r$足够大,广义解就具有最终光滑性。

英文摘要:

In this work, we study a chemotaxis-Navier-Stokes model in a two-dimensional setting as below, \begin{eqnarray} \left\{ \begin{array}{llll} \displaystyle n_{t}+\mathbf{u}\cdot\nabla n=Δn-\nabla \cdot(n\nabla c)+f(n), &&x\inΩ,\,t>0,\\ \displaystyle c_{t}+\mathbf{u}\cdot\nabla c=Δc - c+ n, &&x\inΩ,\,t>0,\\ \displaystyle \mathbf{u}_{t}+κ(\mathbf{u}\cdot\nabla)\mathbf{u}=Δ\mathbf{u} +\nabla P+ n\nablaϕ, &&x\inΩ,\,t>0,\\ \displaystyle \nabla\cdot\mathbf{u}=0,&&x\inΩ,\,t>0.\\ \end{array} \right. \end{eqnarray} Motivated by a recent work due to Winkler, we aim at investigating generalized solvability for the model the without imposing a critical superlinear exponent restriction on the logistic source function $f$. Specifically, it is proven in the present work that there exists a triple of integrable functions $(n,c,\mathbf{u})$ solving the system globally in a generalized sense provided that $f\in C^1([0,\infty))$ satisfies $f(0)\ge0$ and $f(n)\le rn-μn^γ$ ($n\ge0$) with any $γ>1$. Our result indicates that persistent Dirac-type singularities can be ruled out in our model under the aforementioned mild assumption on $f$. After giving the existence result for the system, we also show that the generalized solution exhibits eventual smoothness as long as $μ/r$ is sufficiently large.

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