A coupled level set and volume of fluid method with a re-initialisation step suitable for unstructured meshes

Lyras, Konstantinos G.; Hanson, Bruce; Fairweather, Michael; Heggs, Peter J.

doi:10.1016/j.jcp.2019.109224

Cited by 19 publications

(46 citation statements)

References 64 publications

(139 reference statements)

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“…Here, we address this issue and choose to implement this approach in the context of finite volume method. Our approach also demonstrates at least two times better accuracy compared to the ILSVOF method which has previously reported lower error than the isoAdvector in 38 . We also show that presented method can improve the standard OpenFOAM solver interFoam almost by an order of magnitude for the tests here.…”

Section: Objectivesmentioning

confidence: 62%

“…We also show that presented method can improve the standard OpenFOAM solver interFoam almost by an order of magnitude for the tests here. Most interestingly, we show here that with this mass-conservation correction step for advecting level-set using a simple Runge-Kutta re-initialisation with the idea of 37 , and the flux update algorithm, one might generally be able to avoid using dedicated re-initialisation schemes for re-sharpening level set as in 38,39 . The latter are generally difficult to implement and might result to slower calculations if proper cell-search algorithms are not used for re-distancing.…”

Section: Objectivesmentioning

confidence: 90%

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A finite volume coupled level set and volume of fluid method with a mass conservation step for simulating two-phase flows

Lyras,

Lee

2021

Preprint

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This paper presents a finite volume method for simulating two-phase flows using a level set approach coupled with volume of fluid method capable of simulating sharp fluid interfaces. The efficiency of the method is a result of the fact that the interface is calculated in order to satisfy mass conservation with no explicit interface reconstruction step and the mass fluxes across cell-faces are corrected to respect the recovered volume fraction. The mass-conservation correction step proposed here, is utilised using an iterative algorithm which solves a reactiondiffusion equation for the mass correction of the level set. The re-sharpened volume fraction is used for the new volumetric fluxes at each cell which are calculated through the proposed algorithm that guarantees that they satisfy mass conservation. The algorithm is not limited in representing the interface with the 0.5-contour and is applicable for arbitrary polyhedral cells. Good accuracy and mass conservation are achieved when compared to other conservative approaches.

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Section: Objectivesmentioning

confidence: 62%

Section: Objectivesmentioning

confidence: 90%

A finite volume coupled level set and volume of fluid method with a mass conservation step for simulating two-phase flows

Lyras,

Lee

2021

Preprint

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“…The method avoids the assumption made by similar approaches for the interface position that is not located at the iso-surface contour α-0.5 as in [30][31][32][33].…”

Section: Marker Function For Level Setmentioning

confidence: 99%

“…Compared to other previous works, the level set function is not reconstructed only from the advected volume fraction [31,33] but neither is based on specifically designed schemes for re-initialisation [33,34] that allows for simpler and faster calculations.…”

Section: Marker Function For Level Setmentioning

confidence: 99%

Haemodynamic analysis using multiphase flow dynamics in tubular lesions

Lyras¹,

Lee²

2021

Preprint

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Background and Objective: The role of red blood cell dynamics is emphasised in certain cardiovascular diseases, and thus needs to be closely studied. A multiphase model of blood flow allows the resolution of locally varying density of red blood cells within a complex vessel geometrical domain, and haemodynamic consequences of such build up.Methods: A novel computational fluid dynamics solver for simulating multiphase flows is used for modelling blood flow using level set for a sharp interface representation. Single-phase simulations and reduced order models are used for pressure comparisons. The new solver is used for numerically studying AHA type B lesions. The impact of hematocrit and degree of stenosis on the haemodynamics of coronary arteries is investigated. Results:The comparisons with single-phase flow simulations indicate differences in pressure when considering red blood cell aggregation. Multiphase simulations provide slightly lower pressure drop for the same stenosis severity compared to the single-phase simulations. Secondary flow patterns and the interactions between the two phases leads to the red blood cell aggregation at the end of the diastole cycle, which significantly changes the red blood cell distribution, the shear stresses and velocity in tubular lesions.Conclusions: Neither pressure drop nor mean velocity are not strongly

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“…Therefore, apart from the above mentioned four components of the modeling framework, one additional component is needed to evolve the fluid-fluid interfaces. The fluid-fluid interface can be captured for example using the level-set, VOF [35][36][37] and coupled level-set VOF [38] approach. The framework now has to address two or more moving interfaces and simultaneously couple the multi-fluid flow (velocity and pressure), concentration and temperature fields via appropriately enforced interfacial conditions at the interfaces.…”

Section: Introductionmentioning

confidence: 99%

Modeling of Particle Deposition in a Two-Fluid Flow Environment

Yap¹,

Goharzadeh²

2021

IJHT

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Particle deposition occurs in many engineering multiphase flows. A model for particle deposition in two-fluid flow is presented in this article. The two immiscible fluids with one carrying particles are model using incompressible Navier-Stokes equations. Particles are assumed to deposit onto surfaces as a first order reaction. The evolving interfaces: fluid-fluid interface and fluid-deposit front, are captured using the level-set method. A finite volume method is employed to solve the governing conservation equations. Model verifications are made against limiting cases with known solutions. The model is then used to investigate particle deposition in a stratified two-fluid flow and a cavity with a rising bubble. For a stratified two-fluid flow, deposition occurs more rapidly for a higher Damkholer number but a lower viscosity ratio (fluid without particle to that with particles). For a cavity with a rising bubble, deposition is faster for a higher Damkholer number and a higher initial particle concentration, but is less affected by viscosity ratio.

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A coupled level set and volume of fluid method with a re-initialisation step suitable for unstructured meshes

Abstract: This is a repository copy of A coupled level set and volume of fluid method with a reinitialisation step suitable for unstructured meshes.

Cited by 19 publications

References 64 publications

A finite volume coupled level set and volume of fluid method with a mass conservation step for simulating two-phase flows

A finite volume coupled level set and volume of fluid method with a mass conservation step for simulating two-phase flows

Haemodynamic analysis using multiphase flow dynamics in tubular lesions

Modeling of Particle Deposition in a Two-Fluid Flow Environment

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