arXiv:2610.40898v1 Announce Type: new Abstract: In this paper, we establish global existence of strong solutions for the three-dimensional Cahn--Hilliard--Navier--Stokes system on the torus through finite-dimensional scalar modifications of a prescribed external force. For arbitrary initial data in $H^1\times H^2$ and any force that is locally bounded in time, we construct two smooth scalar corrections, one added to the third component of the fluid force and the other to the phase source. These corrections involve three fixed Fourier frequencies in the fluid equation and one in the phase equation, and act only on a set of times of arbitrarily small total measure. The proof combines a quantitative local theory with repeated returns of the solution to a fixed ball around zero. These returns rely on small-time asymptotic limits that balance the different scales of the two equations, together with a saturation procedure carefully adapted to the structure of the coupled system. Fluid transport generates the phase frequencies that the chosen phase forcing cannot produce on its own. As a consequence, we also obtain global strong solutions for the three-dimensional Navier--Stokes equations with a single smooth scalar correction acting on one component of the force at three fixed Fourier frequencies.
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