Abstract
This paper focuses on the following Keller–Segel–Navier–Stokes system with rotational flux:
in a bounded domain \(\Omega \subset {\mathbb {R}}^3\) with a smooth boundary, where \(\kappa \in {\mathbb {R}}\) is a given constant, \(\phi \in W^{1,\infty }(\Omega )\), \(|S(x,n,c)|\le C_S(1+n)^{-\alpha }\), and the parameter \(\alpha \ge 0\). If \(\alpha >\frac{1}{3}\), then, for all reasonable regular initial data, a corresponding initial-boundary value problem for (KSNF) possesses a globally defined weak solution. This result improves upon the result of Wang (Math Models Methods Appl Sci 27(14):2745–2780, 2017), in which the global very weak solution for the system (KSNF) is obtained. In comparison with the result of the corresponding fluid-free system, the optimal condition on the parameter \(\alpha \) for global (weak) existence is established. Our proofs rely on a variant of the natural gradient-like energy functional.
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Acknowledgements
This work is partially supported by the National Natural Science Foundation of China (No. 11601215) and the Shandong Provincial Science Foundation for Outstanding Youth (No. ZR2018JL005).
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Ke, Y., Zheng, J. An optimal result for global existence in a three-dimensional Keller–Segel–Navier–Stokes system involving tensor-valued sensitivity with saturation. Calc. Var. 58, 109 (2019). https://doi.org/10.1007/s00526-019-1568-2
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DOI: https://doi.org/10.1007/s00526-019-1568-2