Adding a v Term to a v² Term Got Both Ends Right and Missed the Middle by 42% — Prony's Two-Term Drag Law and Re = 60
·7 min read
Bossut measured drag growing with v², Du Buat with v. Prony's sum a·v²+b·v hands over control at Re = 60 and overpredicts settling speed by up to 42% right there.
When the Stream Breaks — Reynolds' Critical Number and the Layered Turbulent Boundary
·8 min read
Pipe transition is usually quoted near Re 2300, yet a quiet pipe can stay laminar to 50,000. The wall then splits into sublayer, buffer, and log layer.
Bugs Swim in Honey — The World of Flow Changed by Reynolds Number
·6 min read
A whale at Re 2.5e8 and a bacterium at 3e-5 share the same water. The factor 1/Re on the viscous term decides which balance actually survives.
Reynolds Number and Flow Transition, Through Visualization
·4 min read
A cylinder wake sits near Strouhal 0.2, pipe flow turns unsteady from Re 2300 to 4000, and a tenfold rise in Re multiplies a DNS mesh by about 178.