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Vortex Shedding Street

Show shedding frequency, period, and vortex spacing from Strouhal number with an animated cylinder wake.

visual calculatorAerodynamics & External Flow

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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input scale
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model
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check
Strouhalvortex sheddingwakevisualization
formula
KaTeX rendered
f = St U / Dlambda = U / f = D / St\begin{aligned}\text{f = St U / D}\\[0.35em]\text{lambda = U / f = D / St}\end{aligned}
ASCII sourcef = St U / D, lambda = U / f = D / St
CCWCWCCWCWCCWCWCCWCWCCWCWCCWVortex shedding streetlambda ≈ 0.4000 mKarman streetalternating vortices are spaced by U/f = D/St
shedding frequency (Hz)
37.5000
period (s)
0.0267
vortex spacing (m)
0.4000
Re_D
8.167e+4
wake class
Karman street
St
0.2000
D / lambda
0.2000
U / f
0.4000

Cylinder wakes often sit near St = 0.2 over a broad subcritical Reynolds range, but real Strouhal varies with geometry and regime.

Strouhalvortex sheddingwakevisualization