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Well-posedness of the Kolmogorov two-equation model of turbulence in optimal Sobolev spaces

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Abstract

In this paper, we study the well-posedness of the Kolmogorov two-equation model of turbulence in a periodic domain \(\mathbb {T}^d\), for space dimensions \(d=2,3\). We admit the average turbulent kinetic energy k to vanish in part of the domain, i.e. we consider the case \(k \ge 0\); in this situation, the parabolic structure of the equations becomes degenerate. For this system, we prove a local well-posedness result in Sobolev spaces \(H^s\), for any \(s>1+d/2\). We expect this regularity to be optimal, due to the degeneracy of the system when \(k \approx 0\). We also prove a continuation criterion and provide a lower bound for the lifespan of the solutions. The proof of the results is based on Littlewood-Paley analysis and paradifferential calculus on the torus, together with a precise commutator decomposition of the nonlinear terms involved in the computations.

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Notes

  1. Throughout we agree that f(D) stands for the pseudo-differential operator \(u\mapsto \mathcal {F}^{-1}(f\,\mathcal {F}u)\), where \(\mathcal F^{-1}\) is the inverse Fourier transform.

  2. Throughout this text, we note by [s] the integer part of a real number \(s\in \mathbb {R}\), namely the biggest integer which is lower than, or equal to, s.

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Acknowledgements

The work of the second author has been partially supported by the LABEX MILYON (ANR-10-LABX-0070) of Université de Lyon, within the program “Investissement d’Avenir” (ANR-11-IDEX-0007), and by the projects SingFlows (ANR-18-CE40-0027) and CRISIS (ANR-20-CE40-0020-01), all operated by the French National Research Agency (ANR). The work of the third author has been partially supported by the grant PRE2018-083984, funded by MCIN/AEI/ 10.13039/501100011033, by the ERC through the Starting Grant H2020-EU.1.1.-639227, by MICINN through the grants EUR2020-112271 and PID2020- 114703GB-I00 and by Junta de Andalucía through the grant P20-00566.

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Correspondence to Elena Salguero.

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Cuvillier, O., Fanelli, F. & Salguero, E. Well-posedness of the Kolmogorov two-equation model of turbulence in optimal Sobolev spaces. J. Evol. Equ. 23, 68 (2023). https://doi.org/10.1007/s00028-023-00914-x

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