Industries & Applications
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2 Industries & Applications Aerospace High Lift Devices Landing Gear ECS Jet and turbo noise Marine Propeller noise Cavitation Hull/propeller/rudder interaction Automotive Wing mirror Sunroof noise HVAC systems Turbo chargers Cooling fans Exhaust systems Interior transmission Building Environment HVAC ducting Fan noise Power Generation Pipe / duct / cavity resonances Compressor / turbine / combustor Electronics cooling Fan noise Air conditioning
3 Steady-state and Transient Post- Processing Flow & Propagation Simulation Options STAR-CCM+ Aeroacoustics Capabilities Aeroacoustics Steady state Unsteady Compressible Non-reflective Direct Broadband Correlations CURLE (Surface) PROUDMAN (volume) GOLDSTEIN (2D-axisymertric) Synthesized LEE Analogy LILLEY Analogy FW-H Tonal blade passing Turbulence LES DES Direct Simulation of Noise Propagation FW-H Propagation Mesh Frequency Cut-off Point & Surface Inverse FFTs Point & Surface FFTs Non-conformal mapping to structures codes Band Stop & Pass Filters and Finite Impulse Response (FIR) Wave-number analysis including Cross Spectral Analysis for Phase and Coherence Direct export to Acoustics and SEA codes Uniform grid mapping and Export to MATLAB
4 HVAC, ECS, Duct ventilation and discharge AIAA
5 ECS and electronic rack cooling Debatin, K, ECCOMAS CFD 2006 Elbow with flow straightener Inlet Bulk Velocity Plenum Outlet Pressure on all holes on each shelve Restrictor
6 ECS and electronic rack cooling Debatin, K, ECCOMAS CFD 2006
7 ECS and electronic rack cooling Debatin, K, ECCOMAS CFD 2006
8 ECS and electronic rack cooling Debatin, K, ECCOMAS CFD 2006
9 External Aeroacoustic Excitation and Internal Noise Transmission (also, see later) Surface FFT (db) at 500Hz (top) and 1000Hz (bottom) AIAA AIAA SAE
10 Turbo compressor Noise GT
11 HVAC blower, distributor, ducts, flaps SAE
12 Pipe network singing AIAA
13 Sunroof/side-window buffeting real vehicle effects Wall compliance effects Full FSI of compliant walls (above right) Correlations for wall compliance (below right) Leakages SAE Aluminium MDF Perspex Uncorrected Correlated
14 Acoustic Tramsmission Loss - mufflers Pure Acoustical Transmission Loss Including porous media In the presence of flow Idealised geometry test by CD-adapco Production geometry test by InDeSa 1D GT-POWER STAR-CCM+ (unfiltered) STAR-CCM+ (low pass filter) Transmission Loss (db) L l extruded D outer D inner
15 Aerospace: Airframe and Jet noise
16 Trailing edge self Re ~ 2x105
17 Propeller noise vortex wake interaction
18 Hydroacoustics Sound propagation in compressible liquid media Multi-phase phenomena (bubble growth/collapse) Hull boundary layer noise with LES (Re~ )
19 Focus on Transient and Aeroacoustics LES-type turbulence model DES (options of Spalart-Allmaras, k-ε, k-ωsst) DES advection scheme blending Full LES (wall resolved) Advanced wall treatment y+ insensitive Non-reflecting boundaries for ideal gases Acoustic far-field damping in compressible liquids Full Compressibility Interaction between the flow and acoustics Especially for cavity /duct resonances Efficient implicit transient solver 2 nd order space and time discretisation Spectral Analysis FFT and iffts at points and surfaces Auto and Cross spectra coherence and phase Frequency and Wave Number Fourier analysis
20 Direct Propagation in STAR-CCM+ Mesh requirement 20 cells per acoustic wavelength ( λ= c / f ) In ambient air, you need cells of ~15mm to propagate a signal at 1000Hz Domain size = 1000D, (~10 λ ) Double precision code Ideal-gas non-reflective in/outflow boundaries Compressible liquid far-field acoustic reflecting-avoidance treatments
21 Propagation FW-H and 3 rd party code export STAR results capture the acoustic sources for propagation via Ffowcs Williams-Hawkings (far-field propagation of compact sources) STAR offers coupling to 3 rd party propagation codes: FFT, ACTRAN LMS, Virtual.Lab.Acoustics ESI, VA-One 100 Hz 500 Hz Aero-VibroAcoustics Using FVS in STAR-CCM+ Export to SEA and FEA 3150 Hz Overall
22 Introduction to 1D (line) WaveNumber Analysis Bremner and Wilby AIAA Φ c (k,ѡ) Φ 0 (k, ѡ) k k c =ѡ/u c ѡ k 0 =ѡ/c 0 Wavenumber (rad/m)
23 1D wave number analysis on attached and separated zones a - a + u - a - a + u + AIAA AIAA SAE
24 2D wave number analysis at discrete frequencies Convective ridge Acoustic circle
25 Separating the acoustic content
26 Total and acoustic power input to vibration analysis
27 Summary Widely applicable modelling for flow noise prediction Continued investment towards answering current needs driving future expectations in Aeroacoustics and towards AeroVibroacoustics THANK YOU for your KIND ATTENTION
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