Simulation studies of a recorder in three dimensions

Area of Science:

• Acoustics
• Fluid Dynamics
• Computational Physics

Background:

• The sound production mechanism in wind instruments like the recorder involves complex fluid-structure interactions.
• Understanding the aeroacoustics is crucial for instrument design and performance optimization.

Purpose of the Study:

• To investigate the aeroacoustics of a recorder using advanced computational methods.
• To analyze the influence of geometric parameters and blowing conditions on sound generation and spectral properties.

Main Methods:

• Direct numerical simulation (DNS) of the three-dimensional Navier-Stokes equations.
• Spatial mapping of air pressure and velocity to visualize jet dynamics and vortex shedding.
• Spectral analysis of sound pressure outside the instrument.

Main Results:

• Detailed visualization of jet dynamics and vortex shedding near the labium, noting subtle differences in jet motion.
• Identification of significant effects of labium chamfers and position on tonal properties, particularly during tone attack.
• Analysis of spectral changes with variations in blowing speed and transitions between fundamental and harmonic modes.

Conclusions:

• The study provides a comprehensive understanding of recorder aeroacoustics through high-fidelity simulations.
• Geometric features and blowing parameters critically influence the instrument's sound characteristics.
• Findings offer insights for improving recorder design and performance analysis.