Yes. An object moving through water is more or less equivalent to water moving around an object, and the moment you cross a boundary condition, be it depth, vel

Yes. An object moving through water is more or less equivalent to water moving around an object, and the moment you cross a boundary condition, be it depth, velocity, viscosity, the phase transition is instantaneous to all intents and purposes. I’d have entire days of experiments screwed up just by the water being slightly too warm or cold, or there being dust, or not enough dust, or sunshine, or… fluid dynamics are finicky.