Abstract
We consider the Keller–Segel system of consumption type coupled with an incompressible fluid equation. The system describes the dynamics of oxygen and bacteria densities evolving within a fluid. We establish local well-posedness of the system in Sobolev spaces for partially inviscid and fully inviscid cases. In the latter, additional assumptions on the initial data are required when either the oxygen or bacteria density touches zero. Even though the oxygen density satisfies a maximum principle due to consumption, we prove finite time blow-up of its \(C^{2}\)-norm with certain initial data.
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Notes
The case of rotation with angle \(\pi /2\) results in a very interesting system, for which the question of local well/ill-posedness seems delicate.
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Acknowledgements
IJ has been supported by the New Faculty Startup Fund from Seoul National University, the Science Fellowship of POSCO TJ Park Foundation, and the National Research Foundation of Korea grant No. 2019R1F1A1058486. KK has been supported by NRF-2019R1A2C1084685 and NRF-2015R1A5A1009350. We are grateful to the anonymous referees for various comments and suggestions, which have significantly improved the manuscript. Especially, we are grateful for pointing to us the possibility of the interesting generalization given in Remark 3.4.
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Jeong, IJ., Kang, K. Well-Posedness and Singularity Formation for Inviscid Keller–Segel–Fluid System of Consumption Type. Commun. Math. Phys. 390, 1175–1217 (2022). https://doi.org/10.1007/s00220-021-04292-8
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DOI: https://doi.org/10.1007/s00220-021-04292-8