Silent inflow condition for turbulent boundary layers - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Physical Review Fluids Année : 2017

Silent inflow condition for turbulent boundary layers

Résumé

The generation of a turbulent inflow is a tricky problem. In the framework of aeroacoustics, another important constraint is that the numerical strategy used to reach a turbulent state induces a spurious noise which is lower than the acoustic field of interest. For the study of noise radiated directly by a turbulent boundary layer on a flat plate, this constraint is severe since wall turbulence is a very inefficient source. That is why a method based on a transition by modal interaction using a base flow with an inflection point is proposed to cope with that. The base flow must be a solution of the equations so we use a profile behind a backward-facing step representative of experimental trip bands. A triad of resonant waves is selected by a local stability analysis of the linearized compressible equations and is added with a weak amplitude in the inlet plane. The compressible stability calculation allows the specification of the thermodynamic quantities at the inlet, which turns out to be fundamental to ensure a quiet inflow. A smooth transition is achieved with the rapid formation of Λ-shape vortices in a staggered organization as in subharmonic transition. The dominance of oblique waves promotes a rapid breakdown by the liftup mechanism of low-speed streaks. The quality of the fully turbulent state is assessed and the direct noise radiation from a turbulent boundary layer at Mach 0.5 is obtained with a very low level of spurious noise.
Fichier principal
Vignette du fichier
DYNFLUID_PRF_2017_GLOERFELT.pdf (7.2 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-02445326 , version 1 (20-01-2020)

Identifiants

Citer

Xavier Gloerfelt, Jean-Christophe Robinet. Silent inflow condition for turbulent boundary layers. Physical Review Fluids, 2017, 2 (12), pp.124603-124634. ⟨10.1103/PhysRevFluids.2.124603⟩. ⟨hal-02445326⟩
43 Consultations
66 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More