Potential Singularity of the Axisymmetric Euler Equations with $C^α$ Initial Vorticity for A Large Range of $α$. Part II: the $N$-Dimensional Case
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arXiv
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| Format: | Preprint |
| Publié: |
2022
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| _version_ | 1866913412341039104 |
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| author | Hou, Thomas Y. Zhang, Shumao |
| author_facet | Hou, Thomas Y. Zhang, Shumao |
| contents | In Part II of this sequence to our previous paper for the 3-dimensional Euler equations \cite{zhang2022potential}, we investigate potential singularity of the $n$-diemnsional axisymmetric Euler equations with $C^α$ initial vorticity for a large range of $α$. We use the adaptive mesh method to solve the $n$-dimensional axisymmetric Euler equations and use the scaling analysis and dynamic rescaling method to examine the potential blow-up and capture its self-similar profile. Our study shows that the $n$-dimensional axisymmetric Euler equations with our initial data develop finite-time blow-up when the Hölder exponent $α<α^*$, and this upper bound $α^*$ can asymptotically approach $1-\frac{2}{n}$. Moreover, we introduce a stretching parameter $δ$ along the $z$-direction. Based on a few assumptions inspired by our numerical experiments, we obtain $α^*=1-\frac{2}{n}$ by studying the limiting case of $δ\rightarrow 0$. For the general case, we propose a relatively simple one-dimensional model and numerically verify its approximation to the $n$-dimensional Euler equations. This one-dimensional model sheds useful light to our understanding of the blowup mechanism for the $n$-dimensional Euler equations. As shown in \cite{zhang2022potential}, the scaling behavior and regularity properties of our initial data are quite different from those of the initial data considered by Elgindi in \cite{elgindi2021finite}. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2212_11924 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Potential Singularity of the Axisymmetric Euler Equations with $C^α$ Initial Vorticity for A Large Range of $α$. Part II: the $N$-Dimensional Case Hou, Thomas Y. Zhang, Shumao Analysis of PDEs Numerical Analysis 35Q31, 76B03, 65M60, 65M06, 65M20 In Part II of this sequence to our previous paper for the 3-dimensional Euler equations \cite{zhang2022potential}, we investigate potential singularity of the $n$-diemnsional axisymmetric Euler equations with $C^α$ initial vorticity for a large range of $α$. We use the adaptive mesh method to solve the $n$-dimensional axisymmetric Euler equations and use the scaling analysis and dynamic rescaling method to examine the potential blow-up and capture its self-similar profile. Our study shows that the $n$-dimensional axisymmetric Euler equations with our initial data develop finite-time blow-up when the Hölder exponent $α<α^*$, and this upper bound $α^*$ can asymptotically approach $1-\frac{2}{n}$. Moreover, we introduce a stretching parameter $δ$ along the $z$-direction. Based on a few assumptions inspired by our numerical experiments, we obtain $α^*=1-\frac{2}{n}$ by studying the limiting case of $δ\rightarrow 0$. For the general case, we propose a relatively simple one-dimensional model and numerically verify its approximation to the $n$-dimensional Euler equations. This one-dimensional model sheds useful light to our understanding of the blowup mechanism for the $n$-dimensional Euler equations. As shown in \cite{zhang2022potential}, the scaling behavior and regularity properties of our initial data are quite different from those of the initial data considered by Elgindi in \cite{elgindi2021finite}. |
| title | Potential Singularity of the Axisymmetric Euler Equations with $C^α$ Initial Vorticity for A Large Range of $α$. Part II: the $N$-Dimensional Case |
| topic | Analysis of PDEs Numerical Analysis 35Q31, 76B03, 65M60, 65M06, 65M20 |
| url | https://arxiv.org/abs/2212.11924 |