This paper presents a free and open-source numerical framework for the simulation and the analysis of the sound production in reed and brass instruments. This tool is developed using the freely distributed Python language and libraries, making it available for acoustics student, engineers and researchers involved in musical acoustics. It relies on the modal expansion of the acoustic resonator (...

A unified approach for the numerical simulation of vowels is presented, which accounts for the self-oscillations of the vocal folds including contact, the generation of acoustic waves and their propagation through the vocal tract, and the sound emission outwards the mouth. A monolithic incompressible fluid-structure interaction model is used to simulate the interaction between the glottal jet a...

A pump-jet, which is generally and widely adopted on underwater vehicles for applications from deep sea exploration to mine clearing, consists of a rotor, stator, duct, with the properties high critical speed, propulsion efficiency, great anti-cavitation performance, low radiated noise. The complex interaction flow field between various components degree coupling appendage result in requirement...

1 Robert O. Lawton Distinguished Professor, Department of Mathematics, Fellow AIAA. 2 Post-Doctoral Research Associate, Department of Mathematics. 3 Research Scientist, Structural Acoustics Branch, Aerodynamics, Aerothermodynamics and Acoustics Competency, Member AIAA. 4 Senior Research Scientist, Computational Modeling and Simulation Branch, Aerodynamics, Aerothermodynamics and Acoustics Compe...

Fall 2015 | Acoustics Today | 27 Introduction Vigorous community opposition to aircraft noise exposure is more the rule than the exception at airports worldwide, particularly when efforts are made to increase airport capacity or change operational patterns. Since the introduction of commercial jet service in the late 1950s, these disputes have often been highly contentious, to the point of inte...

The design of a rocket launch environment is complex process with many different aspects that are highly interconnected. Acoustics, which one these, should be investigated in detail due to possible devastating effects on the vehicle, crew, and environment. This study uses numerical method consider passive noise reduction applied supersonic jet impinging an inclined flame deflector decrease acou...

The stability of inkjet printers is a major requirement for high-quality-printing. However, in piezo-driven inkjet printheads, air entrapment can lead to malfunctioning of the jet formation. The piezoactuator is employed to actively monitor the channel acoustics and to identify distortions at an early stage. Modifications of the response of the piezoactuator indicate entrapped air bubbles and t...

This work examines the ability of small-scale, helium-air-mixture, coaxial jets to capture the acoustics of large-scale hot jets representing the exhaust of separate-flow turbofan engines. Experiments at University of California, Irvine (UCI) employed a one-eighth-scale model of a separate-flow nozzle being used at the Nozzle Acoustic Test Rig (NATR) of NASA Glenn Research Center. Comparisons w...

This work examines the ability of small-scale helium–air mixture coaxial jets to simulate the acoustics of largescale hot air jets representing the exhaust of separate-flow turbofan engines. Experiments employed a one-eighthscale model of a separate-flow nozzle used in hot tests at NASA John H. Glenn Research Center. Comparisons were conducted for two set points using the following methods: mat...