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)
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 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.