pub.mdw | The inﬂuence of side hole undercutting on vorticity

Abstract

Vortices in musical instruments form in a non-uniform flow, where air currents of different velocities or directions mix. Non-uniform flow, in the case of flutes or recorders, occurs at the labium, at the open end and at the side holes. Side hole undercutting has been shown to minimise vortex formation. Previous numerical simulations have visualised airflow velocity influence on vorticity. In experimental studies, where a tube with a side hole was excited by a loudspeaker, it was observed that speaker loudness and hole geometry influenced the vorticity. Recent simulations explore the effect of undercutting on the transient and show detailed results on the vortex formation. In this study, we aim to compare vortex formation between 6 different side hole geometries with a significant undercut and another 6 without undercutting, under realistic input conditions. Using the same geometry as in the simulations mentioned above, we employ time-resolved Particle Image Velocimetry to measure flow velocity at a sampling rate of 10 kHz. The recorder is excited utilising a commercial recorder mouthpiece with constant input conditions maintained at 100 Pa.

Date Issued 2025-05

Authors

Lasickas, Titas | University of Music and Performing Arts Vienna

Chatziioannou, Vasileios | University of Music and Performing Arts Vienna

Caridi, Giuseppe Carlo Alp

Soldati, Alfredo

DOI 10.1121/2.0002091

Language en

License CC-BY-4.0

Subjects Acoustics Musical instruments Atmospheric dynamics Flow visualization

ÖFOS mit Kunstzweigen

20% NATURWISSENSCHAFTEN - Informatik

40% NATURWISSENSCHAFTEN - Mathematik

40% NATURWISSENSCHAFTEN - Physik, Astronomie