Imprint of vortical structures on the near-field pressure of a turbulent jet - Archive ouverte HAL Access content directly
Journal Articles AIAA Journal Year : 2022

Imprint of vortical structures on the near-field pressure of a turbulent jet

Abstract

The distributions of turbulent scales in a Mach 0.9 isothermal round jet are investigated for the purpose of developing linear surface-based models for the noise source that can be informed by a Reynolds-averaged Navier Stokes (RANS) solution of the flow field. The jet is calculated by large-eddy simulation (LES) which enables the computation of two-point space-time correlations throughout the jet and its near acoustic field. Time, length, and convective-velocity scales are examined on the surface of peak Reynolds stress (SPS), representing the location of the most energetic eddies, and on a "radiator surface" at the boundary between the rotational and irrotational fields. The nature of the space-time correlations is different for axial velocity fluctuations and pressure fluctuations. Velocity-based correlations appear to capture localized turbulent events, while pressure-based correlations appear dominated by the interaction of large eddies with the surrounding potential flow. The correlation length scales are larger on the radiator surface than on the SPS thus indicating that small-scale eddies do not make a significant imprint on the radiator surface. The scales associated with an emulated RANS solution of the flow are compared to the LES-based scales. Simple relationships are inferred that may aid the development of rapid predictive models.
Fichier principal
Vignette du fichier
J061010R1_22AUG2021_titleok.pdf (2.4 Mo) Télécharger le fichier
Origin : Files produced by the author(s)

Dates and versions

hal-03573256 , version 1 (24-02-2022)

Identifiers

Cite

Andres Adam, Dimitri Papamoschou, Christophe Bogey. Imprint of vortical structures on the near-field pressure of a turbulent jet. AIAA Journal, 2022, 60 (3), pp.1578-1591. ⟨10.2514/1.J061010⟩. ⟨hal-03573256⟩

Altmetric

Share

Gmail Facebook X LinkedIn More