Vortex Shedding Frequency Calculator
Kármán vortex frequency behind a cylinder — chimneys, thermowells, cables.
If f approaches the structure's natural frequency, lock-in amplifies vibration — the killer of thermowells (ASME PTC 19.3 TW exists for exactly this).
Formula
Vortex Shedding Frequency Calculator is a free vortex shedding for process, mechanical and water engineers — instant, accurate and 100% client-side, with the governing formula and reference shown next to the result so the number can be defended, not just quoted.
About Vortex Shedding Frequency Calculator
Kármán vortex frequency behind a cylinder — chimneys, thermowells, cables. The calculation implements f = St·V / D (ASME PTC 19.3 TW — thermowells; Blevins, Flow-Induced Vibration). If f approaches the structure's natural frequency, lock-in amplifies vibration — the killer of thermowells (ASME PTC 19.3 TW exists for exactly this).
How to use Vortex Shedding Frequency Calculator
- 1Enter Flow velocity in m/s.
- 2Enter Cylinder diameter in mm.
- 3Enter Strouhal number (Circular cylinder ≈ 0.21 (Re 300–2×10⁵)).
- 4Read Shedding frequency instantly — no submit button needed.
- 5Need US units? Flip the SI/Imperial toggle and every field converts.
Why use Vortex Shedding Frequency Calculator?
- ✓Implements the standard formula — f = St·V / D
- ✓Reference cited on-page: ASME PTC 19.3 TW — thermowells; Blevins, Flow-Induced Vibration
- ✓One-click SI ⇄ Imperial toggle — values convert in place, physics stays in SI
- ✓Live worked example: the substitution recomputes from your numbers
- ✓Runs entirely in your browser — nothing uploaded, free forever
Frequently asked questions
What formula does the Vortex Shedding Frequency Calculator use?+
It computes f = St·V / D, per ASME PTC 19.3 TW — thermowells; Blevins, Flow-Induced Vibration. The formula is displayed under the result along with a worked example substituted with your own inputs.
What should I keep in mind when using this calculator?+
If f approaches the structure's natural frequency, lock-in amplifies vibration — the killer of thermowells (ASME PTC 19.3 TW exists for exactly this).
Does this work for any fluid?+
Yes — density and viscosity are inputs (with common fluids suggested in the field hints), so the same physics applies to water, oils, gases and process fluids. Compute always runs in SI internally, so unit mix-ups can't corrupt the result.
Is the Vortex Shedding Frequency Calculator free to use?+
Yes — completely free, no sign-up, no limits. It runs client-side in your browser, so inputs stay private and results are instant even on slow connections.
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