Two lifetimes, crossing
The mean time for a turbulent puff to decay and the mean time for it to split into two, against Reynolds number, on a logarithmic axis spanning thirty orders of magnitude. Below the crossing puffs die faster than they multiply; above it they multiply faster than they die, and the flow stays turbulent.
6 essays call
what-turbulence-forgets. 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 what-turbulence-forgets 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.
- A puff that does not know how old it is Transition and turbulence
- How far downwind a surface is remembered Transition and turbulence
- A dissipation that lags its production Transition and turbulence
- A closure with no memory at all Transition and turbulence
- A dissipation correlated across every scale Transition and turbulence
- A wake that keeps the drag and forgets the body Transition and turbulence