Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Numerical investigation of splitter plates as noise reduction techniques for tandem cylinders
Submission Author:
Lucas Gregório Cardoso , MT , Brazil
Co-Authors:
Lucas Gregório Cardoso, Filipe Dutra da Silva
Presenter: Filipe Dutra da Silva
doi://10.26678/ABCM.COBEM2023.COB2023-0985
Abstract
In recent years, there has been an increased focus on investigating methods for aircraft noise mitigation due to demands from government regulations, created to reduce its adverse effects on the population. Tandem cylinders in cross flow represent a simplified view of some of the sound-source phenomena which occurs, for instance, in landing gears. This study addresses the area of computational aeroacoustics and aims to investigate the noise generated by vortex shedding in tandem cylinders through numerical simulations using the OpenFOAM open source code. Numerical simulations were performed for a benchmark case of a flow around a tandem cylinder model using the URANS k-ω SST turbulence model. Preliminary grid sensitivity studies considered the effects of mesh refinement in the longitudinal direction on the aeroacoustic field results, as well as the adoption of hybrid meshes that combine structured and unstructured elements. After assessing the effect of the mesh topology, the interaction of upstream cylinder vortices with the downstream cylinder surface and the effects of adding splitter plates to reduce noise for observer in the far field were studied using Ffowcs Williams-Hawkings analogy. The results showed that longitudinal mesh refinement provides accuracy for the numerical results and that adopting a hybrid mesh does not impact acoustic results, while significantly reducing processing time. Also, the addition of splitter plates was able to significantly reduce noise in the far field, attenuating spectral harmonic peaks through a mechanism that reduced the vortex shedding on the upstream cylinder, which impinge on the downstream cylinder surface, also reducing its drag coefficient.
Keywords
Airframe noise, Tandem cylinders, OpenFOAM, compurational aeroacustics
