C+F_A Robust Interface Method for Drop Formation and Breakup Simulation_high density Ratio_Extrapolated lquid velocity.pdf (7.4 MB)
A robust interface method for drop formation and breakup simulation at high density ratio using an extrapolated liquid velocity
journal contribution
posted on 2016-09-19, 13:13 authored by Feng Xiao, Mehriar Dianat, Jim McGuirk© 2016 The Authors. A two-phase flow formulation for atomisation modelling is presented, with a Coupled Level Set/Volume Of Fluid (CLSVOF) technique adopted for interface-tracking. In order to achieve stable numerical solution at high density ratios, an extrapolated liquid velocity field is constructed and used in discretisation of the momentum equations. Solution accuracy is also improved when this field is also used in the scalar (VOF and Level Set) advection equations. A divergence-free algorithm is proposed to ensure satisfaction of the continuity condition for the extrapolated liquid velocity. The density and viscosity across the interface are treated sharply as a function of the Level Set to maintain the physical discontinuity. The developed method is shown to accurately predict drop formation in low Re liquid jets and the deformation and breakup morphology of a single droplet in uniform air flow at different Weber numbers (from 3.4 to 96). The mechanism for droplet breakup is determined based on an analysis of the simulation results. The computed Rayleigh–Taylor instability wavelength extracted from the acceleration of the simulated liquid droplet agrees well with experimental measurements and theoretical analysis, confirming that Rayleigh–Taylor instability dominates single drop breakup in the Weber number range studied. Finally, the influence of liquid viscosity on droplet breakup is numerically investigated; the critical Weber number separating deformation and breakup regimes is well predicted at different Ohnesorge numbers in comparison with the experimental data.
Funding
This work was financially supported from an EPSRC (SAMULET project and Dorothy Hodgkin Award (in conjunction with Rolls-Royce) for the first au- thor) and National Natural Science Foundation of China (Grant No. 11402298 ).
History
School
- Aeronautical, Automotive, Chemical and Materials Engineering
Department
- Aeronautical and Automotive Engineering
Published in
Computers and FluidsVolume
136Pages
402 - 420Citation
XIAO, F., DIANAT, M. and MCGUIRK, J.J., 2016. A robust interface method for drop formation and breakup simulation at high density ratio using an extrapolated liquid velocity. Computers and Fluids, 136, pp. 402-420.Publisher
© The Authors. Published by ElsevierVersion
- VoR (Version of Record)
Publisher statement
This work is made available according to the conditions of the Creative Commons Attribution 4.0 International (CC BY 4.0) licence. Full details of this licence are available at: http://creativecommons.org/licenses/by/4.0/Acceptance date
2016-06-25Publication date
2016-06-27Notes
This is an Open Access Article. It is published by Elsevier under the Creative Commons Attribution 4.0 Unported Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/4.0/ISSN
0045-7930Publisher version
Language
- en