# Asymptotic Properties of Steady and Nonsteady Solutions to the 2D Navier-Stokes Equations with Finite Generalized Dirichlet Integral

Hideo Kozono, Yutaka Terasawa, Yuta Wakasugi

1 被引用数 (Scopus)

## 抄録

We consider the stationary and non-stationary Navier-Stokes equations in the whole plane R2 and in the exterior domain outside of the large circle. The solution v is handled in the class with ∇v ∈ Lq for q ≥ 2. Since we deal with the case q ≥ 2, our class is larger in the sense of spatial decay at infinity than that of the finite Dirichlet integral, that is, for q = 2 where a number of results such as asymptotic behavior of solutions have been observed. For the stationary problem we shall show that ω(x) = o(|x|−(1/q+1/q2)) and ∇v(x) = o(|x|−(1/q+1/q2)log|x|) as |x| → ∞, where ω ≡ rotv. As an application, we prove the Liouville-type theorem under the assumption that ω ∈ Lq(R2). For the non-stationary problem, a generalized Lq-energy identity is clarified. We also apply it to the uniqueness of the Cauchy problem and the Liouville-type theorem for ancient solutions under the assumption that ω ∈ Lq(R2 × I).

本文言語 English 1299-1316 18 Indiana University Mathematics Journal 71 5 https://doi.org/10.1512/iumj.2022.71.8978 Published - 2022

• 数学 (全般)

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