Industries & Applications -...
Transcript of Industries & Applications -...
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Industries & Applications
Aerospace
• High Lift Devices
• Landing Gear
• ECS
• Jet and turbo noise
Automotive
• Wing mirror
• Sunroof noise
• HVAC systems
• Turbo chargers
• Cooling fans
• Exhaust systems
• Interior transmission
Building Environment
• HVAC ducting
• Fan noise
Electronics cooling
• Fan noise
• Air conditioning
Power Generation
• Pipe / duct / cavity resonances
• Compressor / turbine / combustor
Marine
• Propeller noise
• Cavitation
• Hull/propeller/rudder interaction
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STAR-CCM+ Aeroacoustics Capabilities F
low
&
Pro
pag
ati
on
CURLE (Surface)
PROUDMAN (volume)
GOLDSTEIN
(2D-axisymertric)
LEE Analogy
LILLEY Analogy
FW-H Tonal blade
passing
LES
DES
FW-H Propagation
Sim
ula
tio
n
Op
tio
ns
Steady state Unsteady
Broadband
Correlations Synthesized
Direct
Direct
Simulation of
Noise
Propagation
Ste
ad
y-s
tate
an
d
Tra
nsie
nt
Po
st-
Pro
cessin
g
Mesh Frequency Cut-off Point & Surface FFTs
Point & Surface Inverse FFTs
Direct export to Acoustics and SEA codes
Aeroacoustics
Band Stop & Pass Filters and Finite Impulse Response (FIR)
Wave-number analysis including Cross Spectral Analysis for Phase and Coherence
Uniform grid mapping and Export to MATLAB
Non-conformal mapping to structures codes
Compressible
Non-reflective
Turbulence
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HVAC, ECS, Duct ventilation and discharge
AIAA2012-2068
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Debatin, K, ECCOMAS CFD 2006
ECS and electronic rack cooling
Elbow with flow straightener
Plenum
Inlet Bulk Velocity
Outlet Pressure on all holes on each
shelve
Restrictor
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Debatin, K, ECCOMAS CFD 2006
ECS and electronic rack cooling
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Debatin, K, ECCOMAS CFD 2006
ECS and electronic rack cooling
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Debatin, K, ECCOMAS CFD 2006
ECS and electronic rack cooling
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External Aeroacoustic Excitation and Internal
Noise Transmission (also, see later)
Surface FFT (dB) at 500Hz (top)
and 1000Hz (bottom)
AIAA2012-2205
AIAA2012-2206
SAE2013-01-0640
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Turbo compressor Noise
GT2012-70028
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HVAC – blower, distributor, ducts, flaps
SAE13-01-0856
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Pipe network singing
AIAA2012-2171
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Sunroof/side-window buffeting – real vehicle effects
Uncorrected
Correlated
Aluminium
Perspex MDF
– Wall compliance effects
• Full FSI of compliant walls (above right)
• Correlations for wall compliance (below right)
– Leakages
SAE2013-01-1012
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Acoustic Tramsmission Loss - mufflers
L
lextruded
Douter Dinner
1D GT-POWER STAR-CCM+ (unfiltered) STAR-CCM+ (low pass filter)
Transmission Loss (dB)
Pure Acoustical Transmission Loss
– Including porous media
– In the presence of flow
Production geometry test by InDeSa
Idealised geometry test by CD-adapco
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Aerospace: Airframe and Jet noise
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Trailing edge self noise @ Re ~ 2x105
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Propeller noise – vortex wake interaction
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Hydroacoustics
– Sound propagation in compressible liquid media
– Multi-phase phenomena (bubble growth/collapse)
– Hull boundary layer noise with LES (Re~107-108)
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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 • 2nd 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
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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
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– STAR results capture the acoustic sources for propagation via
• Ffowcs Williams-Hawkings (far-field propagation of compact sources)
– STAR offers coupling to 3rd party propagation codes:
• FFT, ACTRAN
• LMS, Virtual.Lab.Acoustics
• ESI, VA-One
– Aero-VibroAcoustics
• Using FVS in STAR-CCM+
• Export to SEA and FEA
100 Hz 500 Hz
3150 Hz Overall
Propagation – FW-H and 3rd party code export
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Introduction to 1D (line) WaveNumber Analysis
Φc(k,ѡ)
ѡ
k
k0=ѡ/c0
kc=ѡ/Uc
Φ0 (k, ѡ)
Φc(k,ѡ)
ѡ
k
k0=ѡ/c0
kc=ѡ/Uc
Φ0 (k, ѡ)
Bremner and Wilby AIAA-2002-2551
Wavenumber (rad/m)
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1D wave number analysis on attached and separated
zones
a+ a-
u-
a+ a-
u+
AIAA2012-2205
AIAA2012-2206
SAE2013-01-0640
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2D wave number analysis at discrete frequencies
Convective ridge Acoustic circle
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Separating the acoustic content
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Total and acoustic power input to vibration analysis
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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
Summary
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