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Acoustics

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Sonar Listens to Material PropertiesSonar Listens to Material Properties

NATO Undersea Research Centre in La Spezia, Italy
With the help of multiphysics modeling, a group of researchers at the NATO Undersea Research Centre in La Spezia, Italy, are studying how to use low-frequency...

Fluid-Structure-Acoustic InteractionsFluid-Structure-Acoustic Interactions

AltaSim Technologies, Columbus, OH, USA
The results of fully coupled Fluid-Structure Interaction analyses have allowed AltaSim Technologies to resolve performance issues with new products prior to...

Analysis of unique loudspeaker driver possible only with multiphysics modelingAnalysis of unique loudspeaker driver possible only with multiphysics modeling

SFX Technologies Ltd.
SFX Technologies Ltd. is using COMSOL Multiphysics to design a new type of loudspeaker driver that uses virtually any surface to produce high-quality sound. ...

Hi-Fi Hearing Aids with Multiphysics ModelingHi-Fi Hearing Aids with Multiphysics Modeling

WIDEX A/S
A privately-owned company with a world market share of approximately 10%, Widex launched the world’s first fully digital CIC (completely in the canal)...

Example Models

Acoustic-Structure InteractionAcoustic-Structure Interaction

Liquid or gas acoustics coupled to structural objects such as membranes, plates or solids are important applications in many engineering fields. This model is a general demonstration of an acoustic fluid phenomenon in 3D that is...

Muffler with PerforatesMuffler with Perforates

Reflective mufflers are best suited for the low frequency range where only plane waves can propagate in the system, while dissipative mufflers with fibers are efficient in the mid-to-high frequency range. Dissipative mufflers based on...

Jet PipeJet Pipe

This example models the radiation of fan noise from the annular duct of a turbofan aeroengine. When the jet stream exits the duct, a vortex sheet appears along the extension of the duct wall due to the surrounding air moving at a lower...

Absorptive MufflerAbsorptive Muffler

The sound level from a car depends to a great extent of the quality of the muffler. Over the years, researchers in the car industry have struggled to produce mufflers that are efficient from both an acoustic and an environmental...

Car InteriorCar Interior

In this model, a point source generates a pressure wave in the Sound Brick, a testbench car interior. The sound level is measured at another point and at a range of frequencies high enough that a good mesh resolution is required to...

Loudspeaker DriverLoudspeaker Driver

This is a model of a loudspeaker of the dynamic cone driver type, common for low and medium frequencies. The model analysis includes the total electric impedance and the on-axis sound pressure level at a nominal driving voltage, as...

Flow DuctFlow Duct

The modeling of aircraft-engine noise is a central problem in the field of computational aeroacoustics. The acoustic field in a model of an axially symmetric aero-engine duct, generated by a noise source at the boundary, is computed and...

Bessel PanelBessel Panel

The Bessel panel is a way to arrange a number of loudspeakers so that the angular sound distribution resembles that of a single speaker. This model combines five Bessel panels in the same pattern to approximate a purely radial sound...

Hollow CylinderHollow Cylinder

Fluid acoustics coupled to structural objects, such as membranes or plates, represents an important application area in many engineering fields. Some examples are: • Loudspeakers • Acoustic sensors • Nondestructive impedance...

Piezo-Acoustic TransducerPiezo-Acoustic Transducer

A piezoelectric transducer can be used either to transform an electric current to an acoustic pressure field or, the opposite, to produce an electric current from an acoustic field. These devices are generally useful for applications that...

Ultrasound Scattering Off a CylinderUltrasound Scattering Off a Cylinder

This 2D model studies the scattering of ultrasound waves off a cylindrical obstacle with different acoustic properties than those of the surrounding medium. The ultraweak variational formulation (UVWF) makes it possible to resolve the...

Loudspeaker Driver in a Vented EnclosureLoudspeaker Driver in a Vented Enclosure

This example models the acoustic behavior of a woofer mounted in a bass reflex enclosure and placed in the corner of a room. One of the most important design parameters for a loudspeaker driver is its sensitivity as a function of the...