FINE™/Acoustics

Acoustics simulation software for Aero-Vibro-acoustics

With this fully integrated chain for Aero-Vibro-Acoustics simulation, users can solve the most complex acoustic problems. User-friendly application-dedicated wizards provide automation of the most complex steps, and tight integration with the NUMECA CFD solutions provides a direct identification of the noise sources.


 

The complete CFD Acoustics solution

This comprehensive suite combines efficient methods for Aero- and Vibro-Acoustics, from noise propagation and radiation to fluid-structure coupling and calculations for aerodynamic noise from complex flows.

Pre-processing, analysis and post-processing are offered in one user-friendly graphical user interface, with automation based on Python scripts and wizards.


Tonal noise simulation

NASA ANCF fan tonal noise simulation

Computation of mean-flow and unsteady-flow due to harmonic perturbations.

Thanks to the Non-Linear Harmonic method (NLH) noise source and propagation in the near-field (including sound absorbing material) can be calculated simultaneously.

BEM or Ffowcs-Williams & Hawkings (FW-H) methods are used to compute the noise radiation to the far-field microphones.


Broadband noise simulation

Computation of broadband noise generated by flow-turbulence.

Flow-noise source reconstruction based on steady RANS methods ensures significantly faster and more cost effective calculations compared to time domain methods.

In-duct and near-field noise propagation analysis is performed with the Finite Element Method (FEM) and far-field noise propagation with the Boundary Element Method (BEM) and the Ffowcs Williams - Hawkings (FW-H) method for rotating surfaces.

Import of unsteady solutions from any CFD tool possible for LES/DES/URANS coupling.


Transmission Loss

Transmission Loss is an indicator of the noise attenuation performance of silencers and industrial mufflers: the difference between the incident power at an inlet and the transmitted power at an outlet. 

Optimal muffler design requires maximization of noise absorption and minimization of flow pressure losses.


For an interesting customer case on this subject    Read more


Vibro-acoustics with Fluid-Structure coupling

Vibro-acoustics simulation of surface vibration noise which is caused by structure excitation due to:

  • Acoustic sources
  • Unsteady pressure fields
  • Harmonic forces applied to the vibrating structure

 Analysis performed with BEM and FEM methods.

Vibro-acoustics simulation of a muffler


Application-dedicated wizards

User-friendly application-dedicated wizards provide automation of the most complex steps with mimum input.


Key features

ACOUSTICS

CAPABILITIES:

  • Acoustic sources retrieved from experiments or defined analytically.
  • Noise propagation analysis in uniform and non-uniform mean flows.
  • Sound absorption from porous/fibrous materials and perforated sheets.
  • Impedance boundary condition to simulate acoustic liners.

METHODS:

  • Iterative FEM (Finite Element Method) and BEM (Boundary Element Method) solvers, for propagation analysis,based on multi-frequency parallelization technology.
  • FW-H (Ffowcs Williams-Hawkings) solver for radiation analysis, compatible with fixed/rotating, solid/porous radiation surfaces.   
  • Impedance Matrix method for the Transmission Loss analysis of mufflers and exhaust systems.
  • Eigenvalues analysis for cavity modes detection.

AERO-ACOUSTICS

CAPABILITIES:

  • Efficient simulation of TONAL and BROADBAND noise sources thanks to the full integration with NUMECA’s CFD methods (used for noise source characterization).
  • Possibility to exploit CFD solutions obtained with any CFD tool on the market (import of CGNS, Tecplot, FieldView file formats).

 METHODS:

  • Integration with the Nonlinear Harmonic (NLH) method for the simultaneous simulation of TONAL noise source and propagation including liners (ASME GT2014-26429 and ETC ETC2015-197 papers).
    Orders of magnitude faster than with propagation approaches based on unsteady CFD solutions.
  • FINE™/Acoustics includes the Flow-Noise method for the analysis of BROADBAND noise based on the reconstruction of synthetic turbulence from a steady RANS solution (SAE 2015-01-2329 paper). 
  • LES, DES, U-RANS solutions can be imported in FINE™/Acoustics and used to characterize the source region and to compute the sound propagation. 

VIBRO-ACOUSTICS

CAPABILITIES:

  • Structure excitation based on acoustic sources, unsteady pressure fields and point forces applied to the vibrating structure.
  • Fluid-structure coupling based on import of structural modes (from NASTRAN, ABAQUS, ANSYS).

METHODS:

  • FEM-BEM solvers for fully coupled vibro-acoustic simulations.
  • Mixed direct-indirect BEM approach to include thin shells in frequency response analysis.
  • FEM cavity modes analysis including sound absorption and structure vibration. 

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