Hydraulics and Fluid Mechanics in ME
For similarity, in addition to models being geometrically similar to prototype, the following in both cases should also be equal

ratio of inertial force to force due to gravitation
ratio of inertial force to force due to surface tension
ratio of inertial force to force due to viscosity
all the four ratios of inertial force to force due to viscosity, gravitation, surface tension, and elasticity

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Hydraulics and Fluid Mechanics in ME
When an ideal fluid flows past a sphere

lowest pressure intensity occurs at front stagnation point
total drag is zero
highest intensity of pressure occurs around the circumference at right angles to flow
lowest pressure intensity occurs at rear stagnation point

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