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Direct numerical simulation of turbulent two-phase flows: application to liquid sheet atomization

DOI: 10.1615/ICHMT.2015.IntSympAdvComputHeatTransf.1850
pages 1788-1794

Stephane Vincent
Laboratoire de Modélisations et Simulations Multi-Echelle, Université Paris-Est Marne-la-Vallée, France.

Jean-Luc Estivalezes
ONERA, the French Aerospace Lab, Toulouse, France

Resumo

The atomization of fuel jets in car or plane engines involves complex process with multiphase motions and turbulent flow regimes in a highly coupled way. The Direct Numerical Simulation (DNS) of interfacial flows is investigated in order to characterize the coupling between turbulent flow structures and interface deformations occurring during atomization of a liquid sheet. An incompressible Ghost Fluid formulation of the Navier-Stokes equations is coupled to a level set interface tracking method for representing all the flow and interfacial scales at small scale. A Homogeneous Isotropic Turbulence (HIT) is considered which interacts with an initially flat liquid sheet surrounded by air. The DNS provides detailed simulations used to carry out a parametric study of turbulence-interface interactions according to density and viscosity ratios at the interface as well as surface tension magnitude.

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