Numerical study of multiphase flows using an adaptive filament moment of fluid method

Hergibo, Philippe 2024. Numerical study of multiphase flows using an adaptive filament moment of fluid method. PhD Thesis, Cardiff University. Item availability restricted.

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Abstract

Multiphase flows are present in many industrial and engineering applications as well as in some physical phenomena. Simulations of multiphase flows serve as a crucial tool in understanding the complex fluid dynamics present in various natural and engineering phenomena. The main objective of this study is to develop and advance numerical methods for simulating multiphase flows with a novel approach that can reconstruct under-resolved tructures. Thesecond objective is to evaluate its performance and extend the complexity using adaptivity. The research introduces and refines the moment-of-fluid (MOF) method, particularly in addressing challenges related to interface capturing and fine-scale structure resolution. The first part of the study presents a symmetric approach for reconstructing thin structures, or filaments, using a new efficient approach. The MOF method is extended to an adaptive mesh refinement (AMR) framework, employing a quadtree structure to efficiently resolve thinner structures without a substantial increase in computational cost. The effectiveness of the MOF method and its adpative extension are demonstrated through benchmark problems, showcasing computational efficiency and accuracy. Furthermore, the thesis introduces a novel adaptive dual grid technique, enabling simultaneous adaptive resolution of fine interfacial details and solution of the Navier-Stokes equations on a coarse rid. Validation against benchmark cases demonstrates the capability of the method in accurately capturing complex interface dynamics while maintaining computational efficiency.

Item Type:	Thesis (PhD)
Date Type:	Completion
Status:	Unpublished
Schools:	Schools > Engineering
Uncontrolled Keywords:	Multiphase flow, MOF method, Filament capturing, Interface reconstruction, Adaptive mesh refinement, Dual grid
Funders:	EPSRC
Date of First Compliant Deposit:	27 March 2025
Last Modified:	27 Mar 2025 16:14
URI:	https://orca.cardiff.ac.uk/id/eprint/177211

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