Acoustics of a Muffler

Model ID: 3

This is a model of the pressure wave propagation in a muffler for a combustion engine. The approach is general for analysis of damping of propagation of harmonic pressure waves.

The model shows how 3D acoustics can be modeled in fairly complex geometries. It also shows COMSOL Multiphysics' coupling variable feature between different boundaries.

The problem is solved in the frequency domain and gives the damping effectiveness in the frequency range 100-1000 Hz. The equation used in the model, is a slightly modified Helmholtz's equation.