The Arnold-Tongue of Coupled Acoustic Oscillators

Wind-driven sound generation is a source of anger and pleasure, depending on the situation: airframe and car noise, or combustion noise are some of the most disturbing environmental pollutions, whereas musical instruments are sources of joy. We present an experiment on two coupled sound sources -organ pipes- together with a theoretical model which takes into account the underlying physics. Our focus is the Arnold tongue which quantitatively captures the interaction of the sound sources, we obtain very good agreement of model and experiment, the results are supported by very detailed CFD computations.