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Global bounded weak solutions for a chemotaxis-Stokes system with nonlinear diffusion and rotation
Journal of Differential Equations ( IF 2.4 ) Pub Date : 2021-04-23 , DOI: 10.1016/j.jde.2021.04.020
Jiashan Zheng , Yuanyuan Ke

In this paper, we discuss the following chemotaxis-Stokes system with nonlinear diffusion and rotation{nt+un=Δnm(nS(x,n,c)c),xΩ,t>0,ct+uc=Δcnc,xΩ,t>0,ut+P=Δu+nϕ,xΩ,t>0,u=0,xΩ,t>0 with m>0, where Ω is a bounded domain in R3, S(x,n,c) is a chemotactic sensitivity tensor satisfying SC2(Ω¯×[0,)2;R3×3) and |S(x,n,c)|(1+n)αS0(c) for all (x,n,c)Ω×[0,)2 with α0 and some nondecreasing function S0:[0,)[0,). We can show that if m+α>109, then for any reasonably smooth initial data, the corresponding initial-boundary problem possesses a globally bounded weak solution. The result extends the previous global boundedness result for m+α>109, α>0 and m+54α>98 [15], and m>98 and α=0 [24]. Without using the conventional free-energy inequality see [15], [24], we use a new iterative bootstrap procedure to estimate the bounds on Ωnεp for p>32, which is a crucial step to obtain our main result.



中文翻译:

具有非线性扩散和旋转的趋化Stokes系统的整体有界弱解

在本文中,我们讨论以下具有非线性扩散和旋转的趋化-斯托克斯系统{ñŤ+üñ=Δñ-ñ小号XñCCXΩŤ>0CŤ+üC=ΔC-ñCXΩŤ>0üŤ+P=Δü+ñϕXΩŤ>0ü=0XΩŤ>0>0,其中Ω是 [R3小号XñC 是趋化敏感性张量满足 小号C2个Ω¯×[02个;[R3×3|小号XñC|1个+ñ-α小号0C 对所有人 XñCΩ×[02个α0 和一些非递减功能 小号0[0[0。我们可以证明+α>109,则对于任何合理平滑的初始数据,相应的初始边界问题都具有全局有界的弱解。结果扩展了先前的全局有界结果+α>109α>0+54α>98 [15],以及 >98α=0[24]。在不使用常规自由能不等式的情况下,请参见[15],[24],我们使用新的迭代自举程序来估计Ωñεp 为了 p>32个,这是取得主要成果的关键一步。

更新日期:2021-04-23
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