Acoustics

The Integrated Simulation Suite for Aero-Vibro-Acoustics

FROM FAST PRE-DESIGN CALCULATIONS TO DETAILED LARGE SCALE ANALYSIS

FINE™/Acoustics is a complete simulation suite for the analysis of a broad range of industrial applications involving Acoustics, Vibro-Acoustics and Aero-Acoustics.

TONAL NOISE

Simultaneous noise source and propagation analysis with the Non-Linear Harmonic method (NLH).

BROADBAND NOISE

Flow-noise source reconstruction based on steady RANS. Noise propagation with Boudnary Element Method (BEM) and Finite Element Method (FEM).

LES/DES/URANS COUPLING

Ffowcs Williams - Hawkings (FW-H) solver for radiation analysis. Import of unsteady solutions from any CFD tool.

VIBRO-ACOUSTICS

Fluid-structure coupling based on modal approach.

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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