Reynolds number: one number, four different flows
Reynolds number is inertia ÷ viscosity. It is not a property of the fluid or of the shape but of the combination, and crossing a threshold changes the physics rather than the magnitude.
10 essays call
regime-axis. The drawing above is what it returns with no arguments at all; every
call below passes it something, because a placement that passes nothing draws whichever member
of the family the generator happens to default to rather than the one its essay argues about.
It is also the blast radius. Changing regime-axis changes every figure listed here
at once, and on this site it may change what they assert as well as what they show —
which is what has to be rebuilt and looked at before the change is believed.
Where it is called
What each of these essays asks for instead of the defaults is on the regime index, which reads the parameters back out of the finished figures rather than out of the placements.
- One number decides which physics applies Regimes and numbers
- The Reynolds number, and the length in it Regimes and numbers
- When air stops being incompressible Regimes and numbers
- The angle that does not care Regimes and numbers
- The model that cannot be matched Regimes and numbers
- The world with no inertia Regimes and numbers
- Counting what matters Regimes and numbers
- The wing the equation is really solving Regimes and numbers
- The price of a gradient Viscosity
- Five numbers, one name Transition and turbulence