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Home > Teams > MOST team: Turbulence Modelling and Simulation > Research activity > Past research activity

Numerical simulation of liquid jets sheared by a high-speed stream: Flapping dynamics and interaction with vortical structures

PhD of Nicolas Odier

Financial support : Institut Carnot "Energies du futur"

This study focuses on numerical simulation of liquid jets (plane or axial) sheared by a high-speed stream, for a better understanding of the flapping instability occurring for both geometries. This numerical study is performed at moderate density and velocity ratio between phases. The flapping dynamics of a plane liquid sheet is a consequence of the pressure difference between the two sides of the sheet. A study of the flapping control is performed, as well as a sensitivity study to the high-speed stream boundary layer thickness, and a relevant Strouhal number is proposed. The study focusing on coaxial jets raises a different flapping mechanism: due to high-speed stream shear, interfacial waves are observed near the injection and are likely to get connected, inducing a sinuous organization to the whole jet. The passive and active control of this flapping is studied, as well as the influence of some injection parameter. The momentum-flux ratio (M) isn’t characteristic for the flapping dynamics. Some air-water simulations of an experimental flow studied at LEGI are finally performed. A forcing applied to the liquid inlet is necessary to get interfacial instabilities. Pressure oscillations are evidenced in the gaseous flow inside the nozzle, as well as Görtler vortices.

Publications

Peer-reviewed Publications

2018
Odier, N., Balarac, G., & Corre, C. E. (2018). Numerical analysis of the flapping mechanism for a two-phase coaxial jet. International Journal of Multiphase Flow, 106, 164–178.
2015
Odier, N., Balarac, G., Corre, C. E., & Moureau, V. (2015). Numerical study of a flapping liquid sheet sheared by a high-speed stream. International Journal of Multiphase Flow, 77, 2259.

Conference Proceedings

2014
Odier, N., Balarac, G., & Corre, C. E. (2014). Numerical simulations of a liquid sheet surrounded by a fast stream: interaction between phase interface dynamics and coherents vortices. In 10th European Fluid Mechanics Conference. Copenhagen, Denmark.

Ph.D. Theses

2014
Odier, N. (2014). Numerical simulation of liquid jets sheared by a high-speed stream : flapping dynamics and interaction with vortical structures. Ph.D. thesis, Université de Grenoble, .