On the acoustic trapped modes and their symmetry properties in a circular cylindrical waveguide with a cavity

Driven oscillating nonlinear acoustic waves

“…A more complex system is based on flow acoustic coupling. An example is presented by Langthjem and Nakano [30,31], who studied a long resonance pipe coupled to an expansion cavity like in mufflers and musical instruments. The airflow generates acoustic waves in the pipe via the expansion piece.…”