Strouhal Vortex Shedding

Compute vortex-shedding frequency from Strouhal number, velocity, and length scale.

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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Strouhalvortex sheddingcylinder wake

formula

KaTeX rendered

\begin{aligned}\text{St = f L / U}\\[0.35em]\text{f = St U / L}\end{aligned}

ASCII source

St = f L / U, f = St U / L

StU (m/s)D or L (m)

shedding frequency (Hz)

37.5000

period (s)

0.0267

Circular cylinder wakes often sit near St = 0.2 over a broad subcritical Reynolds-number range.

Strouhal vortex shedding cylinder wake