F_drag = --
Stokes flow (Re → 0): viscosity dominates inertia. Exact analytical solution: ψ = U·r²·sin²θ·(1 - 3R/2r + R³/2r³). Drag = 6πμRU (Stokes law, 1851). The flow is fully reversible — time-symmetric. Streamlines envelope the sphere; wake vanishes at Re ≪ 1.