A viscoelastic two-phase solver using a phase-field approach
Zografos, Konstantinos and Afonso, Alexandre M. and Poole, Robert J. and Oliveira, Mónica S.N. (2020) A viscoelastic two-phase solver using a phase-field approach. Journal of Non-Newtonian Fluid Mechanics, 284. 104364. ISSN 0377-0257 (https://doi.org/10.1016/j.jnnfm.2020.104364)
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Abstract
In this work we discuss the implementation and the performance of an in-house viscoelastic two-phase solver, based on a diffuse interface approach. The Phase-Field method is considered and the Cahn-Hilliard equation is employed for describing the transport of a binary fluid system. The interface between the two fluids utilises a continuum approach, which is responsible for smoothing the inherent discontinuities of sharp interface models, facilitating studies that are related to morphological changes of the interface, such as droplet breakup and coalescence. The two-phase solver manages to predict the expected dynamics for all the cases investigated, and exhibits an overall good performance. The numerical implementation is able to predict the expected physical response of the oscillating drop case, while the performance is also validated by examining the droplet deformation case. The corresponding history of the deformation is predicted for several systems considering Newtonian fluids, viscoelastic fluids and combinations of both. Finally, we demonstrate the ability of the solver to capture the complex interfacial patterns of the Rayleigh-Taylor instability for different Atwood numbers when Newtonian fluids are considered. In the two regimes identified, the system is modified to consider viscoelastic fluids and the influence of elasticity is investigated.
ORCID iDs
Zografos, Konstantinos ORCID: https://orcid.org/0000-0001-5732-7803, Afonso, Alexandre M., Poole, Robert J. and Oliveira, Mónica S.N. ORCID: https://orcid.org/0000-0002-1836-4692;-
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Item type: Article ID code: 73822 Dates: DateEvent1 October 2020Published8 August 2020Published Online3 August 2020AcceptedSubjects: Technology > Mechanical engineering and machinery Department: Faculty of Engineering > Mechanical and Aerospace Engineering
Strategic Research Themes > Ocean, Air and Space
Technology and Innovation Centre > Advanced Engineering and ManufacturingDepositing user: Pure Administrator Date deposited: 15 Sep 2020 09:59 Last modified: 27 Sep 2024 01:18 Related URLs: URI: https://strathprints.strath.ac.uk/id/eprint/73822