Numerical simulation of instability and breakup of turbulent liquid jet using Eulerian-Lagrangian coupling
Sprache des Vortragstitels:
2nd International Conference on Numerical Methods in Multiphase Flows (ICNMMF-II)
Sprache des Tagungstitel:
Primary breakup of liquid jet and its secondary breakup called atomization are of essential importance in several processes dealing with multiphase flows. Fluid instabilities near liquid-gas interface might result in disintegration and breakup, therefore several factors have been identified to influence the primary breakup of a liquid jet mostly based on instability theories.
According to theoretical and experimental works carried out in 1990s primary breakup of turbulent liquid-gas multiphase flow with high density ratios is largely controlled by liquid turbulence properties. Droplet formation due to turbulent primary breakup occurs as a consequence of unbalanced situation between disruptive and consolidating energy effects near fluid interface. (i) The dependency of droplet formation to turbulence modeling and (ii) severe grid resolution requirement make the numerical simulation of primary breakup a computationally challenging problem. In the present work numerical simulations using volume of fluid approach (VOF) are carried out to picture the global spreading of the turbulent liquid jet. We further present a novel idea to capture the droplet formation with less computational costs by using an Eulerian-Lagrangian hybrid concept.