Numerical simulation of the excitation of a Helmholtz resonator by a grazing flow
Abstract
The process of noise generation in a flow-excited Helmholtz resonator involves strong interaction between a time-dependent fluid flow and acoustic resonance. Quantitative prediction of this effect, requiring accurate prediction of time-dependent features of a flow over complex three-dimensional bodies, turbulence modeling, compressibility and Mach number effects, is one of the major challenges to computational fluid dynamics. In this paper a numerical procedure based on the lattice kinetic equation, combined with the RNG turbulence model, is applied to describe a well-controlled experiment on acoustic resonance excitation by a grazing flow [Nelson et al., J. Sound Vib. 78, 15-27 (1981)]. The achieved agreement between numerical and physical experiments is very good. The simulations reveal a universality transformation enabling comparison of the data for different inlet conditions.
- Publication:
-
Acoustical Society of America Journal
- Pub Date:
- October 2003
- DOI:
- 10.1121/1.1606464
- Bibcode:
- 2003ASAJ..114.1833M
- Keywords:
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- acoustic resonators;
- turbulence;
- acoustic resonance;
- computational fluid dynamics;
- aeroacoustics