COMSOL Multiphysicsによる流れに起因するノイズの数値解析

抄録

This research presents a numerical simulation of flow induced cavity noise using the general-purpose simulation software COMSOL Multiphysics. Flow induced cavity noise is caused by turbulent flows, which has been the focus of numerous research studies during the past few decades. In this study, the Detached Eddy Simulation (DES) approach is used to compute the unsteady behavior of the vortex flow field. The DES approach is a hybrid method between the Reynolds Averaged Numerical Simulation (RANS) and the Large Eddy Simulation (LES), where the RANS model is used in the boundary layer and the LES treatment is applied to the separated regions. Therefore, the DES approach provides the accuracy of the LES method with substantially less computational effort. In this paper, the DES model and the Lighthill’s acoustic analogy are coupled to capture the cavity flow-noise in a ducted system. Finally, the results are verified with the experimental data reported by Lafon et al ^[1] in 2003.