Multilayered Porous Material: Poroelastic Waves with Thermal and Viscous Losses (Biot-Allard Model)
Application ID: 34531
In applications where pressure waves and elastic waves propagate in porous materials filled with air both thermal and viscous losses are important. This is typically the case in insulation materials for room acoustics or lining materials in car cabins. Another example is porous materials in mufflers in the automotive industry.
The present models shows how the Biot-Allard model option of the Poroelastic Waves interface is used to model a multilayered porous structure composed of two foam layers, one thin screen, and a blanket. The surface impedance of the system is determined and can be compared to results from a JASA paper.
This model example illustrates applications of this type that would nominally be built using the following products:
however, additional products may be required to completely define and model it. Furthermore, this example may also be defined and modeled using components from the following product combinations:
The combination of COMSOL® products required to model your application depends on several factors and may include boundary conditions, material properties, physics interfaces, and part libraries. Particular functionality may be common to several products. To determine the right combination of products for your modeling needs, review the Specification Chart and make use of a free evaluation license. The COMSOL Sales and Support teams are available for answering any questions you may have regarding this.