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1) In order for the 'scale' flow to represent 'real flow' ( verisimilitude ) we need a minimum Reynolds number ( Rn ) of around 1,000,000, which is the 'supercritical Rn' for a fully developed turbulent boundary layer to exist.
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I'm having trouble sorting out whether the viscosity of the fluid needs to be greater or less at smaller scales.
Gnats feel air like we do water, so maybe a less viscous fluid like ethanol?
Here's a CFD analysis of fifth-wheel teardrops: www.sciencedirect.com: Shape optimisation of teardrop trailers to minimise aerodynamic drag in articulated lorries
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