Abstract
A class of Keller–Segel–Stokes systems generalizing the prototype
is considered in a bounded domain \(\Omega \subset \mathbb {R}^3\), where \(\phi \) and f are given sufficiently smooth functions such that f is bounded in \(\Omega \times (0,\infty )\). It is shown that under the condition that
for all sufficiently regular initial data a corresponding Neumann–Neumann–Dirichlet initial-boundary value problem possesses a global bounded classical solution. This extends previous findings asserting a similar conclusion only under the stronger assumption \(\alpha >\frac{1}{2}\). In view of known results on the existence of exploding solutions when \(\alpha <\frac{1}{3}\), this indicates that with regard to the occurrence of blow-up the criticality of the decay rate \(\frac{1}{3}\), as previously found for the fluid-free counterpart of (\(\star \)), remains essentially unaffected by fluid interaction of the type considered here.
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Acknowledgements
The author acknowledges support of the Deutsche Forschungsgemeinschaft in the context of the project Analysis of chemotactic cross-diffusion in complex frameworks, and he is grateful to Yulan Wang for numerous helpful remarks on this manuscript.
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Communicated by H. Kozono.
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Winkler, M. Does Fluid Interaction Affect Regularity in the Three-Dimensional Keller–Segel System with Saturated Sensitivity?. J. Math. Fluid Mech. 20, 1889–1909 (2018). https://doi.org/10.1007/s00021-018-0395-0
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DOI: https://doi.org/10.1007/s00021-018-0395-0