Development of a Wire Mesh Screen Model for Unsteady Simulation of Noise Reduction Devices, with Application to the Tandem Cylinder Configuration

摘要

This study deals with the development of a numerical wire mesh screen model for the unsteady simulation of aero-acoustic configurations. Such devices are indeed of growing interest for practical applications since their use potentially leads to significant noise reduction effects, while the underlying flow physics remains quite uncertain. Numerical simulations including such devices are therefore of major interest to optimize their possible location and properties, as well as to get a better understanding of the involved physical phenomena. On the basis of several finely-resolved unsteady simulations of the flow through an isolated wire mesh sample (DNS and LES), a numerical wire mesh screen model has been proposed and calibrated. This model relies on local modifications of the velocity and pressure fields, combined with the introduction of a specific turbulent viscosity to account for small-scale turbulence production. An application of the method to the well-known tandem cylinder test case has then been performed and demonstrates that the introduction of wire mesh screens in the flow lead in some cases to a noise reduction effect.