Strouhal Number Calculator

Enter value, select unit and click on calculate. Result will be displayed.

Sr = Strouhal Number      V = Velocity
L = Characteristic Length      f = Frequency

Characteristic Length (L):
Frequency (f):
Velocity (v):
Strouhal Number (Sr):

The Strouhal number (St) is a dimensionless number that describes oscillating flow mechanisms. It is commonly used in fluid dynamics and can be calculated as:

Where:

  • is the frequency of vortex shedding (in Hz)
  • is the characteristic length (e.g., diameter of a cylinder)
  • is the velocity of the flow (in m/s)

This equation is used to analyze and predict vortex shedding and oscillations in various fluid flow scenarios.