Industries stries & A Applic licat ations ions Marine • Propeller noise • Cavitation • Hull/propeller/rudder interaction Automotive • Wing mirror • Sunroof noise Aerospace • HVAC systems • High Lift Devices • Turbo chargers • Landing Gear • Cooling fans • ECS • Exhaust systems • Jet and turbo noise • Interior transmission Electronics cooling Building Environment • • Fan noise HVAC ducting • • Air conditioning Fan noise Power Generation • Pipe / duct / cavity resonances • Compressor / turbine / combustor
STAR-CCM+ CM+ Aeroac acoust oustics ics Capabilit bilities ies Aeroacoustics Simulation Options Steady state Unsteady Compressible Direct Non-reflective Broadband Propagation Direct Synthesized Turbulence Correlations Flow & Simulation of Noise CURLE ( Surface) LES LEE Analogy Propagation PROUDMAN (volume) LILLEY Analogy DES GOLDSTEIN FW-H Tonal blade (2D-axisymertric) FW-H Propagation passing Steady-state and Mesh Frequency Cut-off Point & Surface FFTs Transient Post- Processing Point & Surface Inverse 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
HVAC, C, ECS, S, Duct t ventilation ilation and disc schar arge ge AIAA2012-2068
ECS S and electr tronic onic rack coolin ling Deba bati tin, , K, EC ECCOMA MAS S CFD 2006 2006 Elbow with flow straightener Inlet Bulk Velocity Plenum Outlet Pressure on all holes on each shelve Restrictor
ECS S and electr tronic onic rack coolin ling Deba bati tin, , K, EC ECCOMA MAS S CFD 2006 2006
ECS S and electr tronic onic rack coolin ling Deba bati tin, , K, EC ECCOMA MAS S CFD 2006 2006
ECS S and electr tronic onic rack coolin ling Deba bati tin, , K, EC ECCOMA MAS S CFD 2006 2006
Ext xtern ernal al Aeroa oaco coust ustic ic Excitation itation and Intern ernal al Noise se Tran ansm smission ission (also, lso, see later) er) Surface FFT (dB) at 500Hz (top) and 1000Hz (bottom) AIAA2012-2205 AIAA2012-2206 SAE2013-01-0640
Turbo bo compressor ressor Noise se GT2012-70028
HVAC C – blower er, , distr tribu ibutor or, , ducts, s, flaps ps SAE13-01-0856
Pipe e net etwor ork k singing ging AIAA2012-2171
Sunroo oof/side f/side-windo window w buffeti eting g – real l vehicle le effects ts – Wall compl mplian ance ce effec ects ts • Full FSI of comp mplian ant t wal walls s (above right) ght) • Corre relati tions ns for wal wall comp mplianc nce e (below right ht) – Leaka kages ges SAE2013-01-1012 Alumin iniu ium MDF Persp rspex Uncorrected Correlated
Acoust stic ic Tramsmission amsmission Loss s - muffler flers Pure Acoustical Transmission Loss – Including porous media – In the presence of flow Productio oduction geome ometry test t by y InDeS eSa 1D GT-POWER STAR-CCM+ (unfiltered) Ideali ealise sed d geome ometr try test by CD-ada adapco STAR-CCM+ (low pass filter) Transmission Loss (dB) L l extruded D outer D inner
Aerospa ospace ce: : Airframe frame and Jet et noise se
Traili ailing ng edge self lf noise se @ Re ~ 2x10 5
Propeller peller noise se – vortex x wake e interaction eraction
Hydroac oacousti oustics – Sound propagation in compressible liquid media – Multi-phase phenomena (bubble growth/collapse) – Hull boundary layer noise with LES (Re~10 7 -10 8 )
Focus s on Transient ansient and Aeroa oacoustics coustics – LES-type turbulence model • DES (opti tions ons of Spalart-Allmar maras as, , k- ε, k - ωSST ) • DES advecti tion n scheme blendi ding ng • Full LES (wal wall resolved) ed) – Advanced wall treatment • y+ inse nsens nsitive – Non-reflecting boundaries for ideal gases – Acoustic far-field damping in compressible liquids – Full Compressibility • Intera eracti ction n bet etween the flow and acoustics stics – Espec ecia ially lly for cavi vity ty /duct t reson sonanc ances es – Efficient implicit transient solver • 2 nd nd order r space and time discreti scretisati sation – Spectral Analysis • FFT and iFFTs at points nts and surfac aces es • Auto and Cross ss spectra ctra – coherence nce and phase se • Frequ quency ncy and Wave Number r Fouri rier r analysis sis
Direct ect Propagat pagation ion in STAR-CC 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
Propagat pagation ion – FW FW-H H and 3 rd rd party ty code expor ort – STAR results capture the acoustic sources for propagation via • Ffowcs Williams-Hawki wkings ngs (far-field eld pro ropagati tion n of compact sources) – STAR offers coupling to 3 rd party propagation codes: • FFT, ACTRAN AN 500 0 Hz 100 0 Hz • LMS, , Virtu tual.L al.Lab.A .Acou oustics tics • ESI, VA-One – Aero-VibroAcoustics • Using ng FVS in STAR-CC CCM+ • Export t to SEA and FEA 3150 50 Hz Over erall all
Introdu oduction ction to 1D (line) ine) WaveNumber mber Analysis ysis Bremne mner and Wilby AIAA-200 2002-255 2551 Φ c (k, ѡ ) Φ c (k, ѡ ) k k Φ 0 (k, ѡ ) Φ 0 (k, ѡ ) k c = ѡ /U c k c = ѡ /U c k 0 = ѡ /c 0 k 0 = ѡ /c 0 ѡ ѡ Wave venumber (rad/m) /m)
1D wave number er analysis lysis on attac ached hed and separat arated ed zones es a + a - u - a - a + u + AIAA2012-2205 AIAA2012-2206 SAE2013-01-0640
2D wave number er analysis lysis at disc scre rete e freque uencies cies Convectiv ctive e ridge ge Ac Acoustic tic circl cle
Separat arating g the acoustic stic conten ent
Total al and acoust stic ic power input ut to vibrat ration ion analysis ysis
Summa mmary Widely dely applicable able modellin odelling g for flow w noise se predic dicti tion on Continued ntinued invest stment ent towar ards ds – answering current needs – driving future expectations in n Aeroacous oacoustics ics and towar ards ds AeroV oVibr ibroacou oacoust stics ics THA HANK NK YOU OU for your ur KIND ND ATTEN ENTION TION
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