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Atomization and Sprays
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ISSN Imprimir: 1044-5110
ISSN En Línea: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.2013007439
pages 957-980

TOWARD USING DIRECT NUMERICAL SIMULATION TO IMPROVE PRIMARY BREAK-UP MODELING

Francois-Xavier Demoulin
CORIA UMR 6614, University of Rouen, Technopole du Madrillet, BP 12, 76801 Saint-Etienne-du-Rouvray Cedex, France
Julien Reveillon
CORIA UMR 6614, University of Rouen, Technopole du Madrillet, BP 12, 76801 Saint-Etienne-du-Rouvray Cedex, France
Bernard Duret
UMR6614-CORIA, Technopole du Madrillet, BP 12, Avenue de l'Universite, 76801 Saint-Etienne du Rouvray Cedex, France
Zakaria Bouali
UMR 6614 CNRS CORIA, Rouen University, bp 12−Site universitaire du Madrillet, 76801 St Etienne du Rouvray, France
P. Desjonqueres
UMR 6614 CNRS CORIA, Rouen University, bp 12−Site universitaire du Madrillet, 76801 St Etienne du Rouvray, France
Thibaut Menard
CNRS, CORIA UMR 6614, University of Rouen, Technopole du Madrillet, BP 12, 76801 Saint- Etienne-du-Rouvray Cedex, France

SINOPSIS

This paper focuses on the use of direct numerical simulation (DNS) in the context of spray atomization modeling. Key features of such liquid/gas simulations, which are necessary for confidence in model accuracy, are recalled and discussed together with their inherent limitations. Particular attention is given to the lack of theories relating to the determination of the smallest length scale in turbulent liquid-gas flows. To demonstrate how direct numerical simulation can serve modeling purposes, this paper discusses three major areas of possible applications of DNS. First, DNS databases were created to validate modeling approaches inflow areas where no experimental measurements are available. In this paper, this approach is applied to diesel injection conditions to validate the Eulerian−Lagrangian spray atomization (ELSA) model. Second, because models are necessary to mitigate computational costs, which constitute the main drawback of DNS, this paper proposes the development of a large eddy simulation formulation of the liquid atomization, thereby enabling results that are no longer mesh resolution dependent. Finally, once the large scale is correctly captured, it is necessary to ensure an accurate representation of the liquid structure falling below the subgrid scale. To this end, a source term for the surface density equation is established based on direct numerical simulations of liquid-gas flows embedded in an isotropic turbulence and covering both dense and moderately dense ranges.


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