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Froude Number
Compare inertia against gravity to assess free-surface and gravity-wave dominance.
visual calculatorDimensionless Numbers
Read the flow shape before trusting the number.
This page turns a CFD setup into regime, scale, and dominant-effect cues. Adjust the calculator below and compare the moving graphic with the computed result.
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Froudefree surfacegravity wave
formula
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Fr = U / sqrt(g L)Fr
0.9030
regime
subcritical
Fr below 1 indicates gravity waves can propagate upstream. Fr above 1 is typical of supercritical free-surface flow.