Affiliation:
1. School of Mathematics and Statistics, University College Dublin, Belfield, Dublin 4, Ireland
Abstract
We review and apply the continuous symmetry approach to find the solution of the three-dimensional Euler fluid equations in several instances of interest, via the construction of constants of motion and infinitesimal symmetries, without recourse to Noether’s theorem. We show that the vorticity field is a symmetry of the flow, so if the flow admits another symmetry then a Lie algebra of new symmetries can be constructed. For steady Euler flows this leads directly to the distinction of (non-)Beltrami flows: an example is given where the topology of the spatial manifold determines whether extra symmetries can be constructed. Next, we study the stagnation-point-type exact solution of the three-dimensional Euler fluid equations introduced by Gibbon
et al.
(Gibbon
et al.
1999
Physica D
132
, 497–510. (
doi:10.1016/S0167-2789(99)00067-6
)) along with a one-parameter generalization of it introduced by Mulungye
et al.
(Mulungye
et al.
2015
J. Fluid Mech.
771
, 468–502. (
doi:10.1017/jfm.2015.194
)). Applying the symmetry approach to these models allows for the explicit integration of the fields along pathlines, revealing a fine structure of blowup for the vorticity, its stretching rate and the back-to-labels map, depending on the value of the free parameter and on the initial conditions. Finally, we produce explicit blowup exponents and prefactors for a generic type of initial conditions.
This article is part of the theme issue ‘Mathematical problems in physical fluid dynamics (part 2)’.
Subject
General Physics and Astronomy,General Engineering,General Mathematics
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1. Editorial: Mathematical problems in physical fluid dynamics: part II;Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences;2022-05-09