// multi-utility computation suite · offline · instant · precise
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sci.vortex-induced-vibration-Strouhal Calculator
Calculates vortex-induced vibration frequency using the Strouhal number: f_v = St × U/D, and resonance condition when f_v equals structural natural frequency. Strouhal number St ≈ 0.2 for cylinders at Re 300–3×10⁵ — resonance (lock-in) causes amplified oscillation and fatigue; vibration strakes disrupt coherent shedding.
Inputs
St
Count of items or occurrences.
D M
Distance across a circle through its centre. Always confirm units match the rest of the calculation.
U M S
Speed in a specified direction (m/s). Required for momentum, kinetic energy, and wave calculations.
Results
vortex shedding frequency fs (Hz)
Sample size or count used in the calculation.
Strouhal number St
Sample size or count used in the calculation.
reduced velocity Ur = 1/St
Reference formula or conversion factor shown for context.
lock-in range
The difference between the maximum and minimum values.
St = fs·D/U
Reference formula or conversion factor shown for context.
resonance risk
Overall risk level based on the computed score or classification. Higher risk may call for mitigating actions or additional review.