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Reynolds Number

Dimensionless ratio of inertial to viscous forces; the x-axis of every friction-coefficient correlation.

ResistanceHydrodynamics
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Formula, assumptions, and limits

Re=VLν\text{Re} = \frac{V \cdot L}{\nu}
SymbolMeaningUnit
VVShip speedm/s
LLWaterline lengthm
ννKinematic viscositym²/s

Source: ITTC Recommended Procedure 7.5-02-03

In short

Dimensionless ratio of inertial to viscous forces; the x-axis of every friction-coefficient correlation.

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