Aeroacoustics relates to flow induced noise which is audible in the human hearing range and flow/acoustic induced vibration which excites structures. Computational Fluid Dynamics (CFD) is very capable of simulating the sources of aeroacoustic noise directly or indirectly, in addition to propagating the noise in the environment.
Aeroacoustics cuts across a variety of industries and applications like aerospace, automotive, rail and energy. In the automotive industry, aeroacoustic design is important for both OEMs and suppliers to reduce and control the noise generated by the vehicle as a whole, in addition to noise from individual components and their integration with the main system.
STAR-CCM+ offers solutions for aeroacoustics in various areas including external aerodynamic noise, sun-roof buffeting, rotating machinery noise, noise from ducts, cavities and pipe networks.
The main differentiators of STAR-CCM+ include uncompromising physics, automated meshing and solution process, comprehensive boundary conditions for acoustics simulations, easy handling of complex geometries including automated clean-up and excellent accuracy. The process for aeroacoustic simulations inside STAR-CCM+ includes:
Steady-state model optimization
Steady state RANS model to identify source locations for broadband correlations or synthesized fluctuations.
The steady state simulations include surface (Curle) and volume (Proudman) noise correlations to locate maximum noise and analyze parametric changes and their effects.
Transient direct source capture
Transient aeroacoustic simulation capabilities within STAR-CCM+ includes Unsteady RANS, DES and LES.
With its complex suite of advanced turbulence models, ease-of-use, full compressibility and advanced boundary conditions, STAR-CCM+ offers the most efficient commercial transient solver for aeroacoustic simulations.
Transient direct propagation
STAR-CCM+ accurately captures the acoustic sources for direct propagation of noises via the Ffowcs Williams-Hawkings (FWH) method for far-field propagation of compact sources without internal reflections.
Coupling is available to 3rd party propagation codes like ACTRAN, VA-One and SYSNOISE. Recent technologies in this area include solutions for VibroAcoustics using FVS in STAR-CCM+ and exporting to SEA and FEA codes.