Helmholtz Resonator with Porous Layer

Application ID: 96871

This tutorial model shows a system consisting of a Helmholtz resonator on the side of a main duct. The resonator volume is partly filled with a porous material. The model computes the reflection, transmission, and absorption of the system.

Thermoviscous losses are included in the model using Narrow Region Acoustics, while the porous material is modeled with a Poroacoustics model. The porous domain is described with the full JCAL model as well as the Three-parameter JCAL approximation model, and the results are compared.

The model is featured in the blog post: Modeling Acoustical Properties of Porous Media in COMSOL®

This model example illustrates applications of this type that would nominally be built using the following products: