An efficient process for quieter products
The prediction of source of noise within a system is becoming an increasingly important step in the design process. STAR-CCM+ has a flexible range of options for the study of aeroacoustics from steady state methods through to full direct simulation using LES and far field propagation.
  • Sunroof buffeting and acoustical impedance of flexible structures : the noise associated with sunroof buffeting is caused by unsteady flow over the sunroof opening interacting with the roof panel and radiating sound to the vehicle occupants.
  • Aeroacoustics on HVAC system : vibro-acoustics and aero-acoustics can be combined to model complex aero-vibro-acoustics problems such as those encountered in HVAC systems.
  • Transient aeroacoustics simulation on landing gear.
  • Aero-acoustic analysis offers insight into the noise emissions due to turbulent flow and the interaction of aerodynamic forces with the aircraft structure. Depicted here is an LES analysis of a leading edge flap for aero-acoustics.
  • Vortex Shedding from Landing Gear for Acoustics

Steady State Models

Steady state models may be used early in the design process to identify possible sources of noise and to mitigate against them. STAR-CCM+ provides the Curle, Proudman and Goldstein axisymetric noise source models which may be used in RANS simulations. The Linearized Euler equation (LEE) and Lilley noise source model are available for synthesized fluctuations - stochastic noise generation and radiation (SNGR)

Direct

For the direct prediction of near field noise sources, STAR-CCM+ has a suite of tools to analyse the output from the simulation. These capabilities include point, line and surface Fourier transforms (FFT), amplitude and frequency data set functions, inverse FFT, band pass and stop filters and two point spectral analysis.

Far Field Propagation

For the study of noise sources propagating beyond the near field, STAR-CCM+ has a number of different options. Within STAR-CCM+, the user has the option to use the integrated Ffowcs Williams-Hawkings model. It is also possible to export data to far field propagation codes with integration with FFT ACTRAN, LMS Virtual.Lab.Acoustics and VA-One from ESI.

Aero-Vibro-Acoustics

Aero-vibro-acoustics is a study of noise and vibration through a structure due to excitation by an unsteady flow across the surfaces of the structure.

STAR-CCM+ allows you to perform fluid flow simulation typically using transient, compressible Detached Eddy Simulation or Large Eddy Simulation and the vibro-acoustic response to that fluid flow can be modeled using a combination of vibro-acoustic methods that include Finite-Element Analysis and Statistical Energy Analysis.

For modelling far field propagation and aero-vibro-acoustics, STAR-CCM+ can be integrated with FFT ACTRAN, LMS Virtual.Lab.Acoustics, VA-One from ESI, Cambridge Collaborative’s SEAM, and Dassault Systemes’s SIMULIA Abaqus.

STAR-CCM+ features sophisticated post-processing of results that can also show the interaction of flow and acoustics instabilities. This can be done with a P-prime plot, mean pressure at each point subtracted from the instantaneous fluid and acoustical pressures.

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