Identification of the aeroacoustic response of a low Mach number flow through a T-joint

Abstract

A methodology to study numerically the aeroacoustic response of low Mach number confined flows to acoustic excitations is presented. The approach combines incompressible flow computations, vortex sound theory, and system identification techniques, and is applied here to study the behavior of a two-dimensional laminar flow through a T-joint. Comparison with experimental results available in literature shows that the computed source models capture the main physical mechanisms of the sound production in the shear layer of the T-joint.

Aeroacoustics of the swinging corrugated tube: Voice of the Dragon

“…This corresponds to the assumption that the flow is locally incompressible. 31 Following these ideas, incompressible 2D axisymmetric simulations were performed for a single cavity. The inlet of the computational domain is located at 0:5W upstream of the cavity; such a short inlet pipe section is chosen to make sure that the imposed inlet velocity profiles do not evolve significantly before reaching the cavity.…”

“…These three velocity profiles, namely top hat pipe profile used by Martínez et al, 31 fully turbulent pipe profile for a smooth pipe and profile that is obtained by RANS simulation of a generic corrugated pipe are compared in Fig. 10.…”

“…In the study of Martínez et al 31 on T-joints in pipe systems, a top hat velocity profile with a thin boundary layer was used as an inlet boundary condition. Later, Nakiboglu et al 7 showed that a fully turbulent velocity profile of a smooth pipe is a better approximation for corrugated pipes.…”

Aeroacoustic power generated by multiple compact axisymmetric cavities: Effect of hydrodynamic interference on the sound production

“…source due to the interference of a single cavity in a pipe flow at high Reynolds number with a low Helmholtz number acoustic field. 38 This numerical approach is used in the present study to investigate the hydrodynamic interference observed in the experiments with cavities which are in close proximity of each other.…”

“…These correspond to the assumption that the flow is locally incompressible. 38 Therefore, incompressible 2D-axisymmetric flow simulations were performed. The simulations were carried out at low Reynolds numbers, Re = 4 × 10 3 , without turbulence modeling.…”