Global solutions of two-dimensional Navier-Stokes and Euler equations
The Cauchy problem for the Navier-Stokes system in \(\mathbb{R}^2\) is considered in the vorticity formulation. A new approach to the existence and uniqueness results based upon comparison principles for linear parabolic equations is proposed. The existence of global solutions to Navier-Stokes (NS) and Euler (E) equations with the initial vorticity in \(L^1(\mathbb{R}^2)\) for (NS) and in \((L^1\cap L^r)(\mathbb{R}^2)\), \(r> 2\), is proved. The solution to (NS) is shown to be unique, smooth and continuously dependent on initial data, and the velocity solution to (E) is Hölder continuous in the space and time coordinates. Another result is the existence of a subsequence of solutions to (NS) converging to a solution of (E) as the viscosity vanishes.
scientific article; zbMATH DE number 754030
scientific article