Approximate Weak Solutions to the Vorticity Evolution

O. S. Kotsur ; G. A. Shcheglov ; I. K. Marchevsky

Russian journal of nonlinear dynamics, Tome 18 (2022) no. 3, pp. 423-439.

Résumé

This paper is concerned with the equation for the evolution of vorticity in a viscous incompressible fluid, for which approximate weak solutions are sought in the class of vortex filaments. In accordance with the Helmholtz theorem, a system of vortex filaments that is transferred by the flow of an ideal barotropic fluid is an exact solution to the Euler equation. At the same time, for viscous incompressible flows described by the system of Navier – Stokes equations, the search for such generalized solutions in the finite time interval is generally difficult. In this paper, we propose a method for transforming the diffusion term in the vorticity evolution equation that makes it possible to construct its approximate solution in the class of vortex filaments under the assumption that there is no helicity of vorticity. Such an approach is useful in constructing vortex methods of computational hydrodynamics to model viscous incompressible flows.

Détail

Keywords: weak solution, helicity of vorticity, diffusion velocity, viscosity.
Mots-clés : vortex filament

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