An Aeolian tone is produced when air passes over an obstacle, resulting in trailing vortices with oscillatory behavior. These eddies can have strong periodic components, resulting in a steady tone. This phenomenon is the main topic of aeroacoustics;
For air moving over a cylinder, empirical data shows that an Aeolian tone will be produced with the frequency
Aeolian sounds can be produced in the rigging of a sail-powered ship. The vortex trails produced as the wind passes over a rope produce a sound with a frequency that varies with the velocity of the wind and the thickness of the rope. Each doubling of the wind velocity results in an octave increase in the tone, allowing up to a six octave variation in a strong, gusty wind. Ships may also carry Helmholtz resonators that amplify these sounds. Aeolian sounds can also be heard among the openings in limestone cliffs.
- Beyer, Robert Thomas (1999). Sounds of our times: two hundred years of acoustics. Springer. p. 95. ISBN 0-387-98435-6.
- Raichel, Daniel R. (2000). The science and applications of acoustics. AIP series in modern acoustics and signal processing. Springer. ISBN 0-387-98907-2.
- Bartell, Joyce J.; Annenberg School of Communications (University of Southern California). Center for Study of the American Experience (1982). The Yankee mariner & sea power: America's challenge of ocean space : papers from a conference. Transaction Publishers. p. 270. ISBN 0-88474-105-2.