FINE™/Acoustics

The FIRST integrated Aero & Vibro acoustics suite

 

Description

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

 

 


ACOUSTICS

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CAPABILITIES:

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

METHODS:

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

VIBRO- ACOUSTICS

 

vibro_accoustics_jpeg

CAPABILITIES:

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

METHODS:

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

AERO- ACOUSTICS

 

aero_accoustics_jpeg

CAPABILITIES:

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

 METHODS:

  1. 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.
  2. FINETM/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).
    This approach is currently under industrial implementation at NUMECA.
  3. LES, DES, U-RANS solutions can be imported in FINETM/Acoustics and used to characterize the source region and to compute the sound propagation. 

Key Features

Graphical user interface

  1. 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

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

Solvers

  1. Frequency Response solver (coupled FEM/BEM), modeling the sound propagation in presence of non-uniform mean flow.
  2. Eigenvalues (FEM) to evaluate natural acoustic modes (cavity modes), coupled vibro-acoustic modes and modal damping with sound absorption material.
  3. Ffowcs-Williams & Hawkings (FW-H) solver, implementing the acoustic analogy to model noise radiated by fixed/rotating, solid/permeable surfaces.
  4. Integration within the FINE™/Turbo Non Linear Harmonic (NLH) CFD method, specifically suited to compute TONAL noise.
  5. Flow-Noise solver for the prediction of BROADBAND noise produced by “isotropic” turbulence, relying on a cost-effective CFD RANS analysis.

Solvers implementation

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

Post processing

  1. Flexible visualization and manipulation of results.
  2. 2D plots (e.g. spectra or time histories at virtual microphones and nodes).
  3. Average evaluator to extract sound power, impedance, intensity, etc. on groups of elements.
  4. Representation in linear frequencies and 1/3 octave bands.
  5. A-weighing, C-weighing (correction for hearing sensitivity).
  6. Automatic calculation of Transmission Loss (e.g. in mufflers).
  7. 3D view of computed acoustic fields and distributions.
  8. Animation of complex fields (fringe plots).
  9. Audio reproduction of sound at microphones.
  10. Recursive execution through batch files (ASCII).
  11. Export of solutions (plots, fields) in proprietary and ASCII file formats.

 Automation

  1. Automation based on Python scripting

Gallery


 

Industrial applications

  1. 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.
  2. Vibro-acoustics: vibrating structures, NVH, water pumps, marine applications, panel TL, engine radiation, random vibro-acoustics, acoustic fatigue, etc. 
 

 

Webinars

FINE™/Acoustics Webinars (Available on Request)

  1. Acoustic simulation of open-water propeller DTMB 4119 (Jun 2015) 
  2. Flow-Noise simulation of Automotive Applications (Apr 2015)
  3. Tonal and Broadband Noise Simulation of Turbomachinery Applications (Feb 2015)
  4. Flow-Noise analysis of a Car's Mirror based on steady RANS simulation (Sep 2014)
  5. Integrated "CFD - Acoustic" Computational Approach to the Simulation of Aircraft Fan Noise (Jul 2014)
  6. Aero-Vibro-Acoustic simulation of Exhaust Systems and Mufflers (May 2014)
  7. Integrated “CFD - Acoustic” Computational Approach to the Simulation of Contra Rotating Open Rotors (Apr 2014)
  8. Random Vibro-Acoustic analysis of a Solar Array (Jan 2014)
  9. Acoustic Performance Characterization of Automotive Exhaust Systems (Apr 2013)
  10. Vibro-Acoustic Analysis of a Centrifugal Water Pump (Jan 2013)