Anisotropy of a thermal field at dissipative scales in the case of small-scale injection
Résumé
The anisotropy of a thermal field at the level of dissipation has been studied experimentally and by means of modeling, downstream of a heated line source placed, successively, in a turbulent boundary layer and a turbulent plane jet. This situation represents anisotropic small-scale injection of a passive scalar in a turbulent medium. All three instantaneous temperature gradients have been measured. In the central region of the thermal sheet, experimental data reveal a high degree of anisotropy of temperature dissipation near the line source and return to isotropy further downstream. Comparison of measurements with modeling allows interpreting the data and estimating the return-to-isotropy time scale.
Origine : Fichiers éditeurs autorisés sur une archive ouverte
Loading...