Abo Bibliothek: Guest
Fifth International Symposium on Turbulence and Shear Flow Phenomena
August, 27-29, 2007, Technische Universität München, Munich, Germany

DOI: 10.1615/TSFP5

ATTEMPTS TO MODEL DENSITY EFFECTS ON MIXING LAYER GROWTH RATE

pages 55-60
DOI: 10.1615/TSFP5.80
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ABSTRAKT

This paper investigates several new attempts to model the influence of the density ratio of the two streams on the mixing layer growth rate. The model recently proposed by Kreuzinger et al. is not sensitive to the relative orientations of the velocity and density gradient. A revised version has been proposed but is far from being satisfactory. It was concluded that baroclinic effect should be modelled, but not at the dissipation level. Other strategies were thus investigated. For that, the length scale equation, deduced from two-point correlations, was extended to compressible flows. Extra terms linked to density gradient were evidenced and modelled. Models available in the literature were also analyzed. If the high speed flow is lighter, which is the case of propulsion jets, density effects are small and can be captured by some models. But no model is able to correctly capture the density effect on the mixing layer growth rate whatever the density and velocity ratios.

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