Hydraulics and Fluid Mechanics in ME
Reynolds number is significant in

simultaneous motion through two fluids where there is a surface of dis-continuity, gravity forces, and wave making effect, as with ship’s hulls
All of these
supersonics, as with projectile and jet propulsion
full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc

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Hydraulics and Fluid Mechanics in ME
The conditions for the stable equilibrium of a floating body are

all the above are correct
the center of buoyancy and the center of gravity must lie on the same vertical line
a righting couple should be formed
the meta-center should lie above the center of gravity

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