Leapfrogging vortex rings as scaling limit of Euler Equations
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arXiv
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| Format: | Preprint |
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2023
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| _version_ | 1866909543632470016 |
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| author | Buttà, Paolo Cavallaro, Guido Marchioro, Carlo |
| author_facet | Buttà, Paolo Cavallaro, Guido Marchioro, Carlo |
| contents | We consider an incompressible fluid with axial symmetry without swirl, assuming initial data such that the initial vorticity is very concentrated inside $N$ small disjoint rings of thickness $\varepsilon$, each one of vorticity mass and main radius of order $|\log\varepsilon|$. When $\varepsilon \to 0$, we show that, at least for small but positive times, the motion of the rings converges to a dynamical system firstly introduced in [NoDEA Nonlinear Diff. Eq. Appl. 6 (1999), 473-499]. In the special case of two vortex rings with large enough main radius, the result is improved reaching longer times, in such a way to cover the case of several overtakings between the rings, thus providing a mathematical rigorous derivation of the leapfrogging phenomenon. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2310_00732 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Leapfrogging vortex rings as scaling limit of Euler Equations Buttà, Paolo Cavallaro, Guido Marchioro, Carlo Analysis of PDEs Mathematical Physics 76B47, 37N10 We consider an incompressible fluid with axial symmetry without swirl, assuming initial data such that the initial vorticity is very concentrated inside $N$ small disjoint rings of thickness $\varepsilon$, each one of vorticity mass and main radius of order $|\log\varepsilon|$. When $\varepsilon \to 0$, we show that, at least for small but positive times, the motion of the rings converges to a dynamical system firstly introduced in [NoDEA Nonlinear Diff. Eq. Appl. 6 (1999), 473-499]. In the special case of two vortex rings with large enough main radius, the result is improved reaching longer times, in such a way to cover the case of several overtakings between the rings, thus providing a mathematical rigorous derivation of the leapfrogging phenomenon. |
| title | Leapfrogging vortex rings as scaling limit of Euler Equations |
| topic | Analysis of PDEs Mathematical Physics 76B47, 37N10 |
| url | https://arxiv.org/abs/2310.00732 |