Fluid Dynamics Unfolds from Navier-Stokes to Real Smoke Ring

16:9 :root {     --subject: "$fluid dynamic phenomenon"; /* e.g. Kármán vortex street, Smoke ring, Blood flow in aneurysm, Tornado funnel */     --representation: "Navier-Stokes to real flow"; }  # canvas {     background: # 0a192f; }  # subject_render {     mask-image: none;     render-left-side: "Pure fluid dynamics: Navier-Stokes equation in tensor notation, Reynolds number calculation, vorticity vector field, stream function contours, boundary layer profile, all in luminous white chalk on dark slate, with tensor indices.";     render-center: "The flow developing: computational fluid dynamics simulation grids, streaklines and pathlines glowing, vortex shedding sequence, coherent structures visualized as transparent tubes, pressure gradient arrows, transition to turbulence with colour-mapped velocity.";     render-right-side: "Photoreal physical flow: actual smoke ring with internal circulation visible in sunlight, vortex street behind a bridge pillar with real water ripples, aneurysm sac with blood flow jet and wall stress, tornado with debris and condensation funnel, all with motion blur and natural lighting.";     transition-zone: "The viscous term ν∇²u becoming actual shear layers. Streamlines condensing into visible smoke."; }