Lattice Boltzmann aero-acoustics modelling of flow around obstacles

Hicham Machrouki , Denis Ricot , Olivier Coste

In this paper, we suggest to present and discuss the aeroacoustics modelling of flow around different obstacles using LaBS software which is based on Lattice Boltzmann method. Within the framework of a consortium including industrial companies and academics institutes, LaBS was created around Lattice Boltzmann method (LBM). One of the advantages of LBM compared to classical CFD methods is its ability to determine aeroacoustic field by a direct computation of acoustic phenomena. To discuss LaBS performances, a jet flow is studied around a model composed of a cube which is mounted behind a fence. Various reports of scales and velocities are studied. This flow is characterized by the existence of different types of noise (detachment, impact, wake...). Computational results are compared with a complete list of experimental measurements (hot wire, PIV, acoustic source localization...). From an aerodynamic point of view, the flow's global structure is found by computation and unsteady quantities are correctly simulated. From an acoustic point of view, computation and measurements converge on location of the main source and on dipole behavior of radiation.

Domaines: Acoustique [physics.class-ph]

Hicham Machrouki, Denis Ricot, Olivier Coste. Lattice Boltzmann aero-acoustics modelling of flow around obstacles. Acoustics 2012, Apr 2012, Nantes, France. ⟨hal-00811101⟩