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Fluid mechanics
Scalability of simulations

Aeroacoustic Simulation – Sound Generated by Flowing Fluids


Training Expert

Mechanisms and simulation possibilities for noise generation and propagation in fluid flows This training is offered as a 2-day course.

2 days

Basic knowledge of Ansys Fluent, Basic knowledge of fluid mechanics

Software used
Ansys CFD

  • Get insight into aeroacoustic theory
  • Learn about CFD simulation methods for noise sources caused by flow
  • Master different methods for analysis, postprocessing and validation
  • Learn how to make decisions based on quantitative as well as qualitative results


Within many flows, vortices, flow separation or turbulence generate noise which is then propagated further within the fluid and is eventually perceived as unwanted noise. Computational fluid dynamics not only allows to represent the fluid flow itself, but also the noise sources caused by the flow.

In this training course you will learn, how to tackle such problems generated by flow through or around components, vehicles, parts or systems with the help of numerical simulation and ANSYS Fluent. Both qualitative and quantitative approaches are demonstrated, thus showing that the computationally expensive analysis of aeroacoustic phenomena can indeed be realized using already existing computational resources. Furthermore, validation methods for computational results are discussed.

The training addresses engineers dealing with product development and numeric simulation and who are facing noise problems in their daily work, e.g. in the context of fans, ducts, flaps and valves, outlets or mufflers.

Detailed agenda for this 2-day training

Day 1

01 Introduction to the general topic, some history and theory

  • From Lighthill to large eddy: history of flow induced noise
  • Differentiation between vibro-acoustics and aero-acoustics
  • Noise and flow properties, relevant physical dimensions (sound pressure level, acoustic power, vorticity, vortex criterion lambda2)
  • Generation and propagation of sound within fluids

02 Analysis in time and frequency domain

  • Fast Fourier transformation
  • Band filters
  • Demo: Fourier-analysis of flow results
  • Workshop: Fourier-analysis

03 Simplified simulation of broadband noise

  • Theory of acoustic analogies
  • RANS-simulations for aeroacoustic problems
  • Postprocessing capabilities regarding acoustics
  • Workshop: Simulation of broadband noise using the example of an HVAC duct

04 Sound generation in turbo machinery

  • Theoretical background of rotor and fan noise
  • Overview: typical setups for turbo machinery (fans, pumps, etc.)
  • Moving grids and multiple reference frames
  • Rotor-stator interaction and blade-row models
  • Tonal und broadband noise components
  • Workshop: Fan noise simulation

Day 2

05 Far-field considerations

  • Acoustic wave equation solver
  • Ffowks Williams-Hawkins approach
  • Demo: Typical applications
  • Workshop: Fan noise in mounting condition

06 Transient CFD simulation for aeroacoustic problems

  • Possibilities and limitations for different transient methods
  • Turbulence models regarding aeroacoustics
  • Unsteady Reynolds Averaged Simulation (URANS)
  • Stress-blended eddy simulation (SBES)
  • Large-eddy Simulation (LES)

07 Scale resolving simulations

  • Demo: Setting up transient cases
  • Demo: Postprocessing for transient cases
  • Workshop: Transient analysis and postprocessing of an HVAC-Duct

08 Summary and consolidation

  • Demo: Analysis of the acoustics behavior of a complex system (HVAC duct with fan, outlet, vehicle cabin)
  • Comparison of simplified and detailed methods
  • Tips and tricks: Simulation strategies for practical usage
  • Validation possibilities and plausibility checks

Your Trainers

Malte Küper
Consulting & Service, CADFEM (Austria) GmbH, Innsbruck

Placement in the CADFEM Learning Pathway

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What CADFEM customers are saying

Matthias Kowalski
Research & Development, Siemens Energy Global GmbH & Co KG

My expectations were greatly exceeded. The instructor understood very well how to involve all participants despite the different levels of prior knowledge. The accompanying documents and examples are also extensive and helpful.

Dr. Bernhard Streibl
Owner, DrS3 – Strömungsberechnung und Simulation

After participating in this training, I am now familiar with today’s possibilities of aeroacoustic simulation and can use them in our projects. As a positive side effect, I also got an update on the current state of turbulence simulation.

Raphael Lindegger
CAE Engineer, V-Zug AG

For me, I found it positive that this course on aeroacoustics has been distinguished as an Expert Knowledge level. Having learned about relevant workflows as well as how simulation efforts and related hardware and software requirements can be categorized, I feel well equipped in applying the skills taught this course.

Dario Liechti
Development Engineer, Geberit International AG

I highly recommend this very interesting CADFEM training illustrating the principles of aeroacoustics well and shows how to apply aeroacoustic methods in Ansys Fluent.

Do you have questions on the training?

When will I receive the final confirmation for my training booking?

Straight after you sign up, an automatic confirmation of receipt will be sent to the email addresses you provided. Once you have successfully verified the data you provided, you will receive your personalized sign-up confirmation, containing further information on course fees, the billing address, etc., by email within two to three working days.  

As soon as the minimum number of attendees has been reached, you will receive a final training confirmation containing further information. If you have booked an on-site training, we recommend that you wait until you have received this final confirmation before booking your travel and accommodation.

If the minimum number of attendees is not reached, we reserve the right to cancel the training seven days before it is due to start at the latest. We are happy to inform you on changing your booking to an alternative date. Please note that we accept no liability for hotel or travel bookings that attendees have already made.

When is the sign-up deadline for a training?

Training places will generally be allocated based on the order in which attendees sign up. For this reason, we always recommend booking for your desired date as early as possible.

As long as a coures still has free places, it can be booked.

At what time do the training courses begin and end?

Usually the training courses start at 9:00 am and end at 5:00 pm of the respective local time. The actual course times will be stated in the booking confirmation. Please note that, depending on the training host, there may be a possible time shift between your and the provider's local time. Therefore all local times are provided with the valid time shift to Greenwich Mean Time (GMT). 

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