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Acoustics & Vibrations Blog Posts

How to Model Thermoviscous Acoustics in COMSOL Multiphysics

February 28, 2014

Want to solve your acoustics model for acoustic pressure, velocity, or temperature variation? Enter the Thermoviscous Acoustics interface, which offers a simple and accurate way.

Theory of Thermoviscous Acoustics: Thermal and Viscous Losses

February 27, 2014

Here’s your comprehensive introduction to thermoviscous acoustics. Topics covered include theory, physics, boundary layers, bulk losses, attenuation, and narrow region acoustics.

MEMS Microphone Model Presented at ASA 166 in San Francisco

January 2, 2014

What is a MEMS microphone? Learn about this versatile device, as well as how to model it using COMSOL Multiphysics® with the add-on MEMS Module and Acoustics Module.

Thermoacoustics Simulation for More Robust Microphone Analysis

September 19, 2013

When performing an analysis on small-scale audio equipment, such as hearing aids, cell phones, and microphones, the obvious physical phenomenon that’s analyzed is pressure acoustics. However, there are other physics interactions that significantly affect these small devices, including electromechanical interactions and viscothermal losses. Most notably, thermoacoustics (the detailed modeling of acoustics including thermal conduction and viscous losses) is an often overlooked effect that can alter the results of a model. These effects are important in all devices with small length […]

Starting Small with Sonar Dome Design

September 13, 2013

Starting the design process by testing on a small scale is often the best way to tackle issues affecting large objects, like a ship. Detailed in COMSOL News 2013, researchers at INSEAN, The Italian Ship Model Basin, used small-scale testing and then simulation to analyze the effect of placing a sonar system within the bulbous bow at the hull of a ship. Using a small-scale model of a bulbous bow, the researchers at INSEAN performed fluid-structure interaction experiments, and subsequently […]

Modeling Magnetostriction Using COMSOL Multiphysics®

August 26, 2013

If you have ever stood next to a transformer, you have probably heard a humming sound coming from it and wondered if there were bees close by. When you hear that sound the next time, you can rest assured that it’s not bees but the magnetostriction of the transformer core that is making that humming sound.

Tuning an Orchestra with the Help of Multiphysics Simulation

August 14, 2013

Multiphysics applications are all around us. Consider, for example, a setting where science may be the last thing on our minds: a music concert. You might be enjoying the slight sinusoidal variations in atmospheric pressure we call sound waves, or music, but those pressure variations must come from somewhere. In fact, they are due to a multiphysics effect where sinusoidal structural vibrations in an object disturb the surrounding air, causing pressure variations in the air that then propagate outward and […]

Acoustics Tutorial for Modeling Organ Pipe Design

July 19, 2013

The way the sound is shaped as it passes through the pipe of an organ is the result of a carefully calculated and intricate pipe design. Browsing through the Model Gallery, I came across a model of an organ pipe, and it happens to be a great acoustics tutorial for using the Pipe Acoustics, Frequency Domain interface in COMSOL Multiphysics. Let’s talk organ pipe design, and walk through how we can model it with multiphysics software.