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Update 6 Dec 2025 Submitted to Physical Review Fluids (Manuscript ID es2025dec06_673). Under consideration. This expanded manuscript presents the complete mathematical formalism of Multiflux Theory, a new framework for incompressible fluid dynamics that reinterprets turbulence as the dynamic superposition of a finite number N(t) ≈ 8–12 internally coherent, quasi-laminar subflows rather than perturbations on a single laminar base flow. Key contributions: • Exact orthogonal projection of the Navier–Stokes equations onto dynamically coherent subflows • Explicit derivation of the inter-subflow forcing term f_k • Full energy decomposition and exchange framework • Family of physically consistent closures inspired by Mori–Zwanzig memory theory • Reduced-order evolution equation for the number of active subflows N(t) • Formalisation of the PRE-CRT rigidity-growth stage and universal Restoration Collapse Transition (CRT) law with exponent 0.62 • Molecular-to-continuum interpretation, topological representation via moving interfaces, and detailed comparison with POD, DMD, and classical turbulence closures The theory posits that fully aligned laminar flow (N = 1) is a high-energy, forced configuration, whereas rest (N = 0) or multiflux (finite N) constitute the natural attractors of viscous flows. All derivations are accompanied by new diagrams and figures. This preprint fulfils the mathematical completion requested by the international CFD community (CFD Online thread #261616, Nov–Dec 2025) and serves as the foundational reference for subsequent applications, including ablation-free hypersonic thermal protection systems (Metaskinematic Active Skin, Zenodo 17806415). Keywords (copie exatamente assim) Multiflux Theory; turbulence modelling; subflow decomposition; projected Navier-Stokes; inter-subflow forcing; Mori-Zwanzig closure; PRE-CRT; Restoration Collapse Transition; coherent structures; reduced-order modelling; dynamical systems in fluids; molecular origin of turbulence; topological interfaces; N(t) evolution; hypersonic applications License Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) Communities Multiflux (automatic) Related identifiers isSupplementTo → https://doi.org/10.5281/zenodo.17806415 (Metaskinematic Active Skin)