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Lookup NU author(s): Dr Francesco Zonta
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Copyright © 2024 by ASME. In this work, we develop a dual-grid approach for the direct numerical simulations of turbulent multiphase flows in the framework of the phase-field method (PFM). With the dual-grid approach, the solution of the Navier-Stokes equations (flow-field) and of the Cahn-Hilliard equation (phase-field) are performed on two different computational grids. In particular, a base grid - fine enough to resolve the flow down to the Kolmogorov scale - is used for the solution of the Navier-Stokes equations, while a refined grid - required to improve the description of small interfacial structures - is used for the solution of the Cahn-Hilliard equation (phase-field method). The proposed approach is validated, and its computational efficiency is evaluated considering the deformation of a drop in a two-dimensional shear flow. Analyzing the computational time and memory usage, we observe a reduction between ≃30% and ≃40% (with respect to the single-grid approach), depending on the grid refinement factor employed for the phase-field variable. The applicability of the approach to a realistic three-dimensional case is also discussed, by focusing on the breakage of a thin liquid sheet inside a turbulent channel flow. Indications on the grid resolution representing a good compromise between accuracy and computational efficiency in drop-laden turbulence are also provided.
Author(s): Schenk M, Giamagas G, Roccon A, Soldati A, Zonta F
Publication type: Article
Publication status: Published
Journal: Journal of Fluids Engineering
Year: 2024
Volume: 146
Issue: 12
Print publication date: 01/12/2024
Online publication date: 06/06/2024
Acceptance date: 02/05/2024
ISSN (print): 0098-2202
ISSN (electronic): 1528-901X
Publisher: American Society of Mechanical Engineers (ASME)
URL: https://doi.org/10.1115/1.4065504
DOI: 10.1115/1.4065504
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