Aeroacoustic Simulation – Sound Generated by Flowing Fluids
Mechanisms and simulation possibilities for noise generation and propagation in fluid flows This training is offered as a 2-day course.
Duration
2 days
Prerequisites
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
Description
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
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