Well-posedness of logarithmic spiral vortex sheets

TL;DR

This paper rigorously analyzes the well-posedness of 2D logarithmic spiral vortex sheets in the Euler equations, establishing conditions for them to be weak solutions and providing explicit formulas and new tools for their study.

Contribution

It introduces a mathematical framework for logarithmic spirals, proves their well-posedness under certain conditions, and offers explicit formulas and a new winding number concept for analyzing spiral vortex sheets.

Findings

Normal velocity component is continuous across the spiral.

Spiral vortex sheets satisfy velocity and pressure matching conditions.

Results imply well-posedness of symmetric Alexander spirals and sharpness of Delort's theorem.

Abstract

We consider a family of 2D logarithmic spiral vortex sheets which include the celebrated spirals introduced by Prandtl (Vortr\"age aus dem Gebiete der Hydro- und Aero-dynamik, 1922) and by Alexander (Phys. Fluids, 1971). We prove that for each such spiral the normal component of the velocity field remains continuous across the spiral. We give sufficient conditions for spiral vortex sheets to be weak solutions of the 2D incompressible Euler equations. Namely, we show that a spiral gives rise to such a solution if and only if two conditions hold across every spiral: a velocity matching condition and a pressure matching condition. Furthermore we show that these two conditions are equivalent to the imaginary part and the real part, respectively, of a single complex constraint on the coefficients of the spirals. This in particular provides a rigorous mathematical framework for logarithmic spirals, an issue that has remained open since their introduction by Prandtl in 1922. Another consequence of the main result is well-posedness of the symmetric Alexander spiral with two branches, despite recent evidence for the contrary. Moreover, our result implies a sharpness result of Delort's theorem on global existence of solutions to the Euler equations with initial vorticity measure. Our main tools are new explicit formulas for the velocity field and for the pressure function, as well as a notion of a \emph{winding number} of a spiral, which not only gives a robust way of localizing the spirals' arms with respect to a given point in the plane, but also ensures correct asymptotic behaviour near $0$.