FINETM/Acoustics

The FIRST integrated Aero & Vibro acoustics suite

FINETM/Acoustics is a fully CFD Integrated environment dedicated to Aero-Vibro-Acoustic simulations. It provides the capabilities to solve a wide range of aeroacoustic and fully coupled vibro-acoustic problems, from simple pre-design calculations to detailed large scale analyses of complex systems.
Applications

  • Aero-acoustics and Acoustics: aeronautical turbofan engines & nacelles, propellers, contra rotating open rotors (CROR), compressors, turbines, airframe noise, airfoil noise, helicopter's rotor noise, wind turbines, HVAC systems, flow ducts, automotive mufflers and exhausts, marine propellers, etc.
  • Vibro-acoustics: vibrating structures, NVH, water pumps, marine applications, panel TL, engine radiation, random vibro-acoustics, acoustic fatigue, etc.
  • Graphical user interface

  • The GUI enables powerful control of all the modeling steps, from the initial pre-processing, to the solvers' execution, up to the final post-processing and analysis of results.
  • Pre-processing

  • Direct import of the CFD mesh and advanced projection of the CFD results onto the acoustic mesh.
  • Import of structural meshes and results (for vibro-acoustics).
  • Import of acoustic meshes generated by HEXPRESSTM/Hybrid, the NUMECA-integrated CAD cleaning and parallel grid generation system creating conformal body-fitted meshes on complex arbitrary geometry.
  • Acoustic mesh generation from coarsening or shrink-wrapping of the imported CFD and structural meshes.
  • Large set of acoustic boundary conditions and equivalent acoustic sources.
  • Easy application of boundary conditions and flexible definition of multiple-domains.
  • Solvers

  • FlowNoise (DSNG) solver for the prediction of BROADBAND noise produced by "isotropic" turbulence, relying on a cost-effective CFD RANS analysis.
  • Frequency Response solver (coupled FEM/BEM), modeling the sound propagation in presence of non-uniform mean flow.
  • Strong integration within the FINETM/Turbo Non Linear Harmonic (NLH) CFD method, specifically suited to compute TONAL noise.
  • Ffowcs-Williams & Hawkings (FW-H) solver, implementing the acoustic analogy to model noise radiated by fixed/rotating, solid/permeable surfaces.
  • Eigenvalues (FEM) to evaluate natural acoustic modes (cavity modes), coupled vibro-acoustic modes and modal damping with sound absorption material.
  • Solvers implementation

  • A single integrated solver (coupled BEM-FEM).
  • Parallelization of all stages (coefficient calculations, system solution, microphones evaluation).
  • Iterative and Direct solvers available.
  • Cluster solver availability: Windows, Linux (MPI Based).
  • Post processing

  • Flexible visualization and manipulation of results.
  • 2D plots (e.g. spectra or time histories at virtual microphones and nodes).
  • Average evaluator to extract sound power, impedance, intensity, etc. on groups of elements.
  • Representation in linear frequencies and 1/3 octave bands.
  • A-weighing, C-weighing (correction for hearing sensitivity).
  • Automatic calculation of Transmission Loss (e.g. in mufflers).
  • 3D view of computed acoustic fields and distributions.
  • Animation of complex fields (fringe plots).
  • Audio reproduction of sound at microphones.
  • Recursive execution through batch files (ASCII).
  • Export of solutions (plots, fields) in proprietary and ASCII file formats.