work through the paper breaking down exactly how the blow-up is obtained, noting what is novel, building an accessible intuition to a layperson (with strong mathematical foundations). conclude by noting the exact preconditions for the blow-up and how it fails if any of them are relaxed. finally discuss abstractly the metamathematical question of why the calculus (PDE system) is able to exhibit singular behaviour in a physical (proxy) quantity despite the game of keeping the boundary conditions smooth and other physical quantities finite. this is a nuanced discussion and probably redudces to the fact that the (physically counterfactual) infinities are lurking everywhere once you use continua but we want to refine that intuition to be as sharp as possible so we can find out what, if anything, has actually been learned.
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The paper constructs, for every fixed viscosity $\nu>0$, a forced, three-dimensional incompressible Navier–Stokes flow that starts from rest, remains