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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

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.

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 analyses.
• FEM cavity modes analysis including sound absorption and structure vibration.

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.
• 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.
• LES, DES, U-RANS solutions can be imported in FINETM/Acoustics and used to characterize the source region and to compute the sound propagation.

Industrial 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.

FINE™/Acoustics Webinars (Available on Request)

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

KEY FEATURES

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 HEXPRESS™/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

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

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.

Automation

• Automation based on Python scripting