Abstract
As thermoacoustic devices become more efficient, minor losses through sudden expansions or contractions in such acoustic resonators become more important. To further improve the efficiency of thermoacoustic devices it is necessary to understand in detail the fluid dynamic mechanisms involved in these minor losses. In the present study, a parallel numerical simulation of a three-dimensional acoustic resonator, typical of a thermoacoustic device, is presented. A computational aeroacoustic (CAA) approach is used. The Navier–Stokes equations are discretized in space with the fourth-order dispersion-relation-preserving (DRP) scheme of Tam and Webb and are integrated in time with a fourth-order Runge–Kutta scheme. In the attached regions of the flow the Spalart–Allmaras one-equation turbulence model is used. For separated flow regions this transitions automatically to a detached eddy simulation (DES). In the present study a high amplitude standing wave is generated in a resonator with a sudden change in cross-sectional area. Numerical results for the flow field and minor losses are presented and initial results are compared with experimental data. [Work supported by ONR.]
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