As a consequence of inequalities due to Bourgain–Brézis, we obtain local-in-time well-posedness for the two-dimensional Navier–Stokes equation with velocity bounded in spacetime and initial vorticity in bounded variation. We also obtain spacetime estimates for the magnetic field vector through improved Strichartz inequalities.
Chanillo, S., Van Schaftingen, J., & Yung, P.-L. (2016). Applications of Bourgain–Brézis inequalities to fluid mechanics and magnetism. Comptes rendus - Mathématique, 354(1), 51-55. https://doi.org/10.1016/j.crma.2015.10.005 (Original work published 2016)