English

Existence of homogeneous Euler flows of degree $-\alpha\notin [-2,0]$

Analysis of PDEs 2023-05-11 v1

Abstract

We consider (α-\alpha)-homogeneous solutions to the stationary incompressible Euler equations in R3\{0}\mathbb{R}^{3}\backslash\{0\} for α0\alpha\geq 0 and in R3\mathbb{R}^{3} for α<0\alpha<0. Shvydkoy (2018) demonstrated the nonexistence of (1-1)-homogeneous solutions and (α-\alpha)-homogeneous solutions in the range 0α20\leq \alpha\leq 2 for the Beltrami and axisymmetric flows. The nonexistence result of the Beltrami (α-\alpha)-homogeneous solutions holds for all α<1\alpha<1. We show the nonexistence of axisymmetric (α-\alpha)-homogeneous solutions without swirls for 2α<0-2\leq \alpha<0. The main result of this study is the existence of axisymmetric (α-\alpha)-homogeneous solutions in the complementary range αR\[0,2]\alpha\in \mathbb{R}\backslash [0,2]. More specifically, we show the existence of axisymmetric Beltrami (α-\alpha)-homogeneous solutions for αR\[0,2]\alpha\in \mathbb{R}\backslash [0,2] and axisymmetric (α-\alpha)-homogeneous solutions with a nonconstant Bernoulli function for αR\[2,2]\alpha\in \mathbb{R}\backslash [-2,2]. This is the first existence result on (α-\alpha)-homogeneous solutions with no explicit forms. For 2<α<32<\alpha<3, constructed (α-\alpha)-homogeneous solutions provide new examples of the Beltrami/Euler flows in R3\{0}\mathbb{R}^{3}\backslash\{0\} whose level sets of the proportionality factor/Bernoulli surfaces are nested surfaces created by the rotation of the sign "``\infty".

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Cite

@article{arxiv.2305.05987,
  title  = {Existence of homogeneous Euler flows of degree $-\alpha\notin [-2,0]$},
  author = {Ken Abe},
  journal= {arXiv preprint arXiv:2305.05987},
  year   = {2023}
}

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69 pages