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Model ID: 3

Acoustics of a Muffler

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.

The solution at 490 Hz. The real value of the pressure is plotted as isosurfaces, and the absolute value of the pressure is displayed as a boundary plot on the inner walls of the muffler.

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