This paper presents a novel discrete-mechanical framework for modeling spiral galaxy kinematics within a rigid three-dimensional Hexagonal Close-Packed (3HCP) space matrix. By replacing continuous spacetime manifolds with a discrete structural lattice of invariant coordination number Z = 12, we derive macroscopic hydrodynamic observables from underlying finite-difference coordinate relations. We define the dynamic structural clearance gap - the dynamic electro-leeway tensor Luv - governed by the exact local balance between internal expansion and external hydrostatic compaction. Through a multi-variable Taylor series expansion, we establish a definitive mathematical bridge proving that this discrete 3HCP difference scheme rigorously converges onto the classical continuous Cauchy stress matrix and Navier-Stokes equations as the lattice spacing approaches the continuum threshold (h -> 0). Crucially, under extreme structural compression within the galactic equatorial plane, the directional components of the dynamic leeway collapse (Lxx, Lyy -> 0), driving the horizontal entries of the derived Markov Anisotropic Viscosity Tensor Huvab asymptotically toward infinity. This structural lockup paralyzes lateral degrees of freedom, forcing the baryonic disk to rotate as a highly synchronized, rigid turbine plate. This mechanism naturally generates a permanent, non-decaying orbital velocity flat plateau at macroscopic distances. The model completely resolves the flat rotation curve problem of spiral galaxies purely from first-principles discrete lattice physics, bypassing the requirement for speculative dark matter halos or empirical modifications of Newtonian acceleration. Creative Commons Attribution Non Commercial No Derivatives 4.0 International
Efim Sergeevich Markov (Wed,) studied this question.