.png)
Strouhal Number Calculator
The Strouhal number is a dimensionless measure that relates the oscillation frequency of a body to the velocity and characteristic length of the surrounding flow, and describes how periodic patterns such as vortices are generated in a fluid.
The Strouhal Number: A Bridge Between Oscillation and Flow
The Strouhal number is a fundamental parameter in fluid mechanics that describes the relationship between the oscillation frequency of a flow, the fluid velocity, and a characteristic length of the body in its path. Its importance lies in its use in the analysis of flow-induced vibrations, structural resonances, and the aerodynamic design of components exposed to air or water currents.
The interesting thing about the Strouhal number is not only its formulation, but what it reveals: a dynamic balance between inertial forces and the natural frequencies of moving bodies. For example, when air passes around a cylinder, a trail of eddies known as the von Kármán vortex street is generated. These vortices do not appear randomly; their frequency of appearance is in constant proportion to the wind speed and the size of the object. This proportion is precisely the Strouhal number.
This is especially important because, thanks to this phenomenon and because they don't appear randomly, there are measuring devices based on this operating principle, such as vortex and swirl flow meters.
Beyond theory, this number finds applications in aeronautical engineering, biomechanics, meteorology, and even the design of musical instruments. In biology, research has revealed that swimming and flying animals, from trout to hummingbirds, tend to move in ways that optimize their Strouhal number, maximizing the efficiency of their propulsion.
If you need to calculate the Reynolds number you can follow the following link:
At Axotek, we listen to our users. If you need a calculator to make your work and/or projects easier, you can contact us, and as soon as possible, we'll have it online at no cost to you.