Related Experiment Video
Updated: Dec 23, 2025

Measurements of Local Instantaneous Convective Heat Transfer in a Pipe - Single and Two-phase Flow
Published on: April 30, 2018
Prediction of sound absorption by a circular orifice termination in a turbulent pipe flow using the Lattice-Boltzmann
1Department of Mechanical Engineering, McGill University, Montreal, QC H3A 0C3, Canada.
Abstract:
The Lattice Boltzmann method was used to perform numerical simulations of the sound and turbulent flow inside a standing wave tube terminated by a circular orifice in presence of a forced mean flow. The computational domain comprised a standard virtual impedance tube apparatus in which sound waves were produced by periodic pressure oscillations imposed at one end. An orifice plate was located between the driver and the tube termination. All waves transmitted through the orifice were effectively dissipated by a passively non-reflecting (i.e. anechoic) boundary at the tube termination. A turbulent jet was formed at the discharge of the orifice by the forced mean flow inside the tube. The acoustic impedance and sound absorption coefficient of the orifice plate were calculated from a wave decomposition of the sound field upstream of the orifice. Simulations were carried out for different excitation frequencies, and orifice Mach numbers. Results and trends were in good quantitative agreement with available analytical solutions and experimental data. The Lattice Boltzmann method was found to be an efficient numerical scheme for prediction of sound absorption by realistic three dimensional orifice configurations.
Related Concept Videos
Pipe Flowrate Measurement
The orifice meter is a simple,...
Major Losses in Pipes
Fluid flow can be classified as laminar or turbulent, primarily based on the Reynolds number. This dimensionless number reflects the relative influence of inertial to viscous...
Steady, Laminar Flow in Circular Tubes
Laminar Flow
Laminar Flow: Problem Solving
General Characteristics of Pipe Flow II
The distance to reach a fully developed flow is called the entrance length and depends on the...

