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Turbulence Heat and Mass Transfer 6. Proceedings of the Sixth International Symposium On Turbulence Heat and Mass Transfer
September, 14-18, 2009, Rome, Italy

DOI: 10.1615/ICHMT.2009.TurbulHeatMassTransf


ISBN Print: 978-1-56700-262-1

ISSN: 2377-2816

Subgrid-scale interface model for atomizing high-speed liquid jets

page 12
DOI: 10.1615/ICHMT.2009.TurbulHeatMassTransf.1260
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ABSTRACT

The direct numerical simulations performed to date for atomizing high-speed liquid jets do not fully resolve the small scale primary break-up dynamics at the liquid-gas interface. The present work attempts to improve the level of description of the unresolved subgrid-scale geometry of the interface by applying the concept of fractal analysis. In several experiments of atomizing jets (Shavit and Chigier, 1995, Dumouchel et al., 2005), the degree of tortuosity of the interface was measured in terms of a fractal dimension. In the present work, the fractal dimension is modelled using a dynamic procedure, which was originally introduced by Knikker et al. (2004) to describe the highly wrinkled flame surfaces of premixed combustion. The proposed approach is tested in Large-Eddy Simulations (LES) of an atomizing jet, for two different Weber number cases. It is shown that the present concept yields an appropriate measure for the unresolved small-scale structure of the interface.

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