Results 21 to 30 of about 600,184 (313)
Prediction of jet mixing noise with Lighthill's Acoustic Analogy and geometrical acoustics [PDF]
The Journal of the Acoustical Society of America, 2017 A computational aeroacoustics prediction tool based on the application of Lighthill's theory is presented to compute noise from subsonic turbulent jets. The sources of sound are modeled by expressing Lighthill's source term as two-point correlations of the velocity fluctuations and the sound refraction effects are taken into account by a ray tracing ...
Ilário, Carlos R.S. +4 more
openaire +4 more sources
Time-Reversal Analogy by Nonlinear Acoustic–Gravity Wave Triad Resonance
Fluids, 2019 Time reversal of free-surface water (gravity) waves due to a sudden change in the effective gravity has been extensively studied in recent years. Here, we show that an analogy to time-reversal can be obtained using nonlinear acoustic-gravity wave theory.
Usama Kadri
doaj +1 more source
The numerical simulation of compressible jet at low Reynolds number using OpenFOAM [PDF]
E3S Web of Conferences, 2019 The paper presents an analysis of various approaches for calculation gas-dynamic parameters and acoustic perturbations generated by a compressible jet at low Reynolds number (M = 0.9, Re = 3600).
Epikhin Andrey +2 more
doaj +1 more source
Advances in Mechanical Engineering, 2016 Signals in long-distance pipes are complex due to flow-induced noise generated in special structure, and the computation of these noise sources is difficult and time-consuming.
Kai Liu +6 more
doaj +1 more source
Sensors, 2021 Leakage detection methods based on the analysis of leakage acoustic signals provide an effective technical approach for detecting small leaks in water supply pipelines.
Yunfei Li +5 more
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Numerical simulation of flow-induced acoustic oscillations around circular cylinders [PDF]
E3S Web of Conferences, 2020 Questions of numerical simulation of acoustic oscillations generation modes in the liquid flow around the groups of two and three circular cylinders are considered.
Mirnyi Serhii +4 more
doaj +1 more source
A study on a flow/acoustic field hybrid model for turbomachinery based on the permeable data surface
Kongqi donglixue xuebaoTo address the limitations of the ducted blade-row acoustic analogy (DBAA) method in multi-stage turbomachinery where the acoustic source modeling does not adequately consider blade row shielding effects, this paper proposes a novel acoustic analogy ...
Zhenghao Zhang +3 more
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An Acoustic-Analogy Model for Jet-Noise Prediction [PDF]
13th AIAA/CEAS Aeroacoustics Conference (28th AIAA Aeroacoustics Conference), 2007 The solution of the steady Reynolds-averaged Navier Stokes equations (RANS) oers an easy-access model for the time-averaged statistics of turbulent jets. The spatial distribution of mean velocity, turbulent kinetic energy, turbulence dissipation rate, etc. can be modelled by means of commercially-available RANS solvers.
Bassetti, A., Morfey, C.L.
openaire +1 more source
Theoretical and numerical method in aeroacoustics [PDF]
INCAS Bulletin, 2010 The paper deals with the mathematical and numerical modeling of the aerodynamic noisegenerated by the fluid flow interaction with the solid structure of a rotor blade.Our analysis use Lighthill’s acoustic analogy.
Nicuşor ALEXANDRESCU +1 more
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Adaptive Foam 3D Printing of Ultralight and Multifunctional Materials
Advanced Engineering Materials, EarlyView.Adaptive foam 3D printing, enabled by expandable microspheres, imparts cellular structures to thermoplastic and thermosetting polymers, manufactured through a variety of processes including fused filament fabrication, direct ink writing, digital light processing, and inkjet printing.
Nariman Rajabifar, Amir Ameli
wiley +1 more source