Abstract
In this paper we prove the regularity of Leray weak solutions of the Navier–Stokes equations as long as the vorticity projection to a plane is bounded in the scale critical space $$L^p(0,T;L^q)$$ , $$2/p+3/q=2$$ , $$q \in (3/2,\infty )$$ . The plane may vary in space and time while the unit vector $$v=v(x,t)$$ orthogonal to the plane is locally a Holder function in space with the coefficient 1/2. This extends previous works by Chae and Choe and by Miller. We further show that a generalized form of this criterion improves several other regularity criteria in terms of the vorticity direction known from the literature.
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