May 20, 2021 8:30 a.m.–4:20 p.m. CEST

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COMSOL Day: Acoustics

See what is possible with multiphysics simulation

Join us for a full-day online event with a special focus on acoustics. You will have the opportunity to meet with COMSOL technical staff and customers from around the world, engage in product demonstrations, and gain insight into upcoming projects and focuses within acoustics research and industry.

Topics include the analysis of loudspeakers, ultrasound and non-destructive testing (NDT), microacoustics, room acoustics, vibrations, as well as convected acoustics. We will also address topics like optimization, meshing, and solving of large acoustic models. During the presentations you will be encouraged to ask questions. Engineers from COMSOL will be able to answer and present best practices.

Feel free to invite your colleagues. View the schedule below and register for free today!



Please join us 10 minutes before the presentation starts to settle in and make sure that your audio and visual capabilities are working.


To start, we will briefly discuss the format of the day and go over the logistics for using GoToWebinar.


During this session, you will get an introduction to the latest news and trends in acoustics simulation. We will also briefly discuss some of the future developments and ideas for the Acoustics Module.


René Christensen, Acculution

The presentation will briefly go through the different categories of simulations that are most relevant for loudspeaker simulations, and show examples of linear vs. nonlinear simulations as well as stationary vs. frequency vs. time-dependent simulations. It will also be discussed how shape or topology optimization can be added to most, if not all, of these simulations in a way that the design of parts are, to some degree, determined via the simulations themselves, instead of using simulations in a trial-and-error process.

Parallel Sessions

Acoustic propagation in structures with submillimeter physical features is common in the components of consumer products like mobile devices, protective grills of loudspeakers, hearing aids, and perforates used in mufflers and sound insulation. To model this accurately, you need to include thermoviscous losses in your definition of the physics. In this session, you will be introduced to modeling techniques used to capture these effects and how to model nonlinear effects in microacoustics systems.

Introduction to the Acoustics Module

In this session, we will introduce key features within COMSOL Multiphysics® and the Acoustics Module and discuss how to solve the acoustic wave equation in order to model sound generation, propagation, absorption, and attenuation. The key features will be demonstrated by building a simple model, from applying the physics and properties of the system to the different ways to postprocess the results.

Parallel Sessions
Room Acoustics

Acoustic propagation in rooms, halls, car cabins, and other enclosed yet definitive spaces falls within the field of room acoustics. In this session, you will learn how acoustic behavior and response from the features in a room can be modeled in COMSOL Multiphysics® using both ray tracing and full-wave models, in some cases combined with each other. This feature is useful when defining submodels of, for example, a treated wall or absorber, in order to compute the angle-dependent absorption, which is then used in a ray tracing model for the room as a whole.

Convected Acoustics

The analysis of acoustic phenomena in the presence of background mean flow is often referred to as convected acoustics or flow-borne noise. Applications include jet engine noise, mufflers, and perforates, all including the presence of a background flow. This session will introduce the aeroacoustics capabilities of COMSOL Multiphysics® and demonstrate examples of convected acoustics.

Break for Lunch

Naveen Indolia, SCANIA CV AB

Silencers for heavy vehicles have evolved in the past decades into after-treatment systems, which have complex structures, multiple catalyst bricks, perforated plates, microperforated plates, etc. In order to meet the acoustic targets, it is crucial for SCANIA to predict the acoustic performance of these systems during the development phase. The exhaust simulation group NXPS has developed methods to predict the behaviors of sound propagating through these systems as well as that generated within these systems.


Miguel Molerón, Metacoustic

Over the past decade, acoustic metamaterials have emerged as a new paradigm for manipulating acoustic waves. In this presentation, we show a patented vibroacoustic metamaterial concept that efficiently blocks the transmission of sound over a broad low-frequency range. The transmission loss of this solution is significantly better than what can be expected from the classical mass law. Numerical simulations, theory, and practical implementation aspects will be discussed.


Alioli Mattia and Vivek Kumar, Endress+Hauser

This work investigates flow–acoustic interaction for duct components to predict the onset of possible flow–acoustic instabilities. Components in duct systems that create flow separation can, in fact, for certain conditions and frequencies, amplify incident sound waves, and this can affect the performance of the components themselves. This vortex-sound phenomenon, due to the energy transfer between acoustic and vorticity modes in the fluid, is the origin for whistling; i.e., the production of acoustic energy at frequencies close to the resonances of the duct system.

The adopted methodology is based on a linearized Navier–Stokes solver in the frequency domain with the mean flow field computed via Reynolds-averaged Navier–Stokes (RANS) solutions. The whistling potentiality is investigated via an acoustic energy balance to identify frequency regimes where energy amplification might be present.

The results indicate that although whistling is a nonlinear phenomenon caused by an acoustic-flow instability feedback loop, the linearized Navier–Stokes equations can be used to predict the duct system’s ability to whistle or not.

Parallel Sessions
Ultrasound and NDT

A large number of applications involve the modeling of ultrasonic wave propagation in fluids and solids. This includes nondestructive testing (NDT), flowmeters, and ultrasound equipment in medical processes. During this session, you will be introduced to strategies for modeling such phenomena in COMSOL Multiphysics®, from the behavior of piezoelectric transducers to the nonlinear propagation of finite-amplitude ultrasonic waves in fluids.

Meshing for Acoustics

In many cases when defining an acoustics model, you follow some basic guidelines to apply an appropriate mesh based on the physics being modeled. However, in complex systems, when resolving geometries is a determining factor, specific techniques should be used. In this session, you will be introduced to such techniques for the meshing challenges associated with different kinds of acoustics models in complex geometries.

Parallel Sessions

The design and optimization of loudspeakers is a challenging multiphysics problem that requires various numerical approaches, depending on the accuracy required and the complexity of the system. This can range from lumped electroacoustics models in the frequency domain to nonlinear transient analyses of total harmonic distortion. In this session, you will receive insight into the modeling techniques available for loudspeaker simulations as well as appropriate postprocessing tools that provide you with a fully virtual testing environment.

Solvers and Solving Large Models

When solving large acoustics models, it can be beneficial to tune the solvers by considering performance, stability, and memory consumption. A good strategy with respect to meshing and other modeling options is also important. This session will illustrate the process, from choosing one of the predefined solver suggestions in COMSOL Multiphysics® as a starting point to determining how the solver settings can be manipulated and tuned for robust modeling of acoustics phenomena.

Parallel Sessions
Noise and Vibration

Noise and vibration analysis covers areas from ground-borne noise and noise generated by machinery to the analysis of feedback in electroacoustics applications. The physics involved in such applications deal with the combined propagation and interaction of elastic waves in structures and pressure waves in fluids. In this session, you will learn how to model these phenomena through several examples and demonstrations.

Multimethods in Acoustics

Sound and audio phenomena covers large ranges in both wave propagation and wavelength. In order to model all acoustics-based applications, the Acoustics Module uses different numerical methods depending on the application or problem at hand. Some methods are coupled implicitly by the numerical algorithm within COMSOL Multiphysics®, such as the finite element method to the boundary element method, while others require a more manual approach, such as coupling the finite element method to ray approximations. This session will introduce the settings, features, and strategies required to apply both methods.

Concluding Remarks

COMSOL Speakers

Mads J. Herring Jensen
Technology Manager, Acoustics
Mads Herring Jensen joined COMSOL in 2011 and is the technology manager for the acoustics products. Mads has a PhD in computational fluid dynamics from the Technical University of Denmark. Before joining COMSOL, he worked in the hearing aid industry for five years as an acoustic finite element expert.
Kirill Shaposhnikov
Senior Developer, Acoustics
Kirill Shaposhnikov works at COMSOL as a development engineer in the acoustics group. He has a degree in applied mathematics from South-Russian State Polytechnic University and a PhD in mechanical engineering from the Vienna University of Technology. His interests focus on applied mathematics, mathematical physics, and numerical analysis.
Thure Ralfs
Managing Director, Denmark
Thure Ralfs is the managing director of COMSOL's Danish office. Before joining COMSOL in 1997, he worked with various technical software. Thure has an MSc and MBA from the Technical University of Denmark.
James Gaffney
James Gaffney works at COMSOL as an applications engineer for acoustics. He studied acoustical engineering at the University of Southampton, where he also earned his doctorate degree. His research involved predicting the fuselage installation effects from engine fan tones with analytical methods.
Jacob Yström
Technology Director
Jacob Yström is the technology director of numerical analysis at COMSOL. He has been the lead developer for the solver technology at COMSOL since 2005. He received his PhD in numerical analysis from the Royal Institute of Technology, Stockholm.
Jinlan Huang
Lead Applications Engineer
Jinlan Huang is an applications engineer for vibrations and acoustics and instructs acoustics training courses. She received her PhD from Boston University, Department of Aerospace and Mechanical Engineering, investigating acoustic wave propagation in complex-tissue environments and ultrasound-induced tissue heating and bleeding control. She joined COMSOL in 2011.

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COMSOL Day Details

Local Start Time:
May 20, 2021 | 8:30 a.m. CEST (UTC+02:00)
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Invited Speakers

René Christensen

René Christensen has been working with vibroacoustics simulations in the loudspeaker and hearing aid industry for years, and has recently started as a self-employed consultant in this field. René holds a PhD in microacoustics done together with Oticon. For the last 5 years, he has worked extensively with shape and topology for a variety of applications.

Miguel Molerón

Miguel Molerón joined Metacoustic in October 2020 as an R&D project manager. Miguel has a PhD in acoustics from the Université du Mans in France and has been working for more than 10 years on diverse projects involving acoustics simulations and metamaterials.

Alioli Mattia

Alioli Mattia obtained his PhD in aerospace engineering at Politecnico di Milano in 2017, where he has worked as a research assistant in the Department of Aerospace Science and Technology. His primary areas of research included the fluid–structure coupled analysis of flexible membrane wings for micro air vehicle (MAV) applications. Currently, he's a research and development engineer at Endress+Hauser Flowtec AG in Basel (CH), specializing in numerical modeling and simulations of Coriolis mass flowmeters.

Vivek Kumar

Vivek Kumar obtained his PhD in the field of computational fluid dynamics from the University of Erlangen-Nürnberg Germany in 2005. Since 2006, he has worked at Endress+Hauser in Reinach, Switzerland, where he started as a development engineer. Presently, Vivek Kumar is a principal expert and team leader in the Research & Development department of Endress+Hauser, where he works on the area of understanding the fluid dynamics and flow-induced effects in the experimental rigs to calibrate and qualify certain flowmeters. His area of interests are turbulence modeling, fluid–structure interaction, flow-induced noise, vibroacoustics, and heat transfer.

Naveen Indolia

Naveen Indolia works within the exhaust simulation group NXPS and has been involved in the acoustic and flow simulations of SCANIA’s exhaust after-treatment systems for three years. Previous to his current role, he has five years of vibration testing experience from NTPC Ltd., India.