Topic
Volume of fluid method
About: Volume of fluid method is a research topic. Over the lifetime, 5338 publications have been published within this topic receiving 116760 citations.
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TL;DR: A novel adaptive mesh refinement (AMR) strategy based on the moment-of-fluid (MOF) method for volume-tracking of evolving interfaces is presented, which shows the superior accuracy of the AMR-MOF method over other methods.
77 citations
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TL;DR: This paper presents the implementation of a volume-of-fluid-(VOF)-based algorithm for the simulation of free-surface flow problems on general purpose graphical processing units (GPGPUs) and shows that despite the additional non-local operations near the phase interface, this algorithm is suitable for the Simulation of demanding real-world engineering applications.
Abstract: In this paper, we present the implementation of a volume-of-fluid-(VOF)-based algorithm for the simulation of free-surface flow problems on general purpose graphical processing units (GPGPUs). For the solution of the flow field and the additional advection equation for the VOF fill level, the lattice Boltzmann method on the basis of an MRT collision operator is used. A Smagorinsky LES model serves to capture the small-scale turbulent structures of the flow. We show that despite the additional non-local operations near the phase interface, we end up with an algorithm with good overall performance, which is suitable for the simulation of demanding real-world engineering applications.
77 citations
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TL;DR: In this paper, a modified two-dimensional volume of fluid (VOF) method was used to simulate liquid motion in partially saturated fracture apertures under a variety of flow conditions, such as inertial forces, viscosity, gravity acting on the fluid densities, fracture wall wetting, and the pressure drop across curved fluid-fluid interfaces due to surface tension.
Abstract: [1] Complex fluid behavior in unsaturated fracture and fracture networks, such as film flow, the migration, fragmentation, and coalescence of droplets, and rivulet flow with or without meandering or pulsation, has been widely observed in laboratory experiments. In this study, a modified two-dimensional volume of fluid (VOF) method was used to simulate liquid motion in partially saturated fracture apertures under a variety of flow conditions. This modeling approach systematically incorporates the effects of inertial forces, viscosity, gravity acting on the fluid densities, fracture wall wetting, and the pressure drop across curved fluid-fluid interfaces due to surface tension. This allows us to obtain a better understanding of the fundamental physics governing unsaturated fluid flow in fracture apertures. The VOF method is able to handle the complex dynamics of fluid-fluid interfaces and free surfaces in unsaturated fractures by using a fixed Eulerian grid. Fragmentation and coalescence of the fluids are automatically handled without resorting to complex adaptive mesh refinement or interface repairing algorithms. The wetting of fracture walls was modeled by imposing contact angles near the contact lines (contact points in two-dimensional simulations), and different contact angles were automatically chosen depending on whether the liquid interface is advancing, receding, or essentially stationary. The qualitative agreements between the numerical simulations and complex multiphase fluid dynamics reported in laboratory experiments clearly demonstrate the potential value of the VOF method for the mechanistically based modeling of immiscible liquid motion in unsaturated fracture networks.
77 citations
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TL;DR: In this article, a computational fluid dynamics simulation of laminar convection of Al2O3-water bio-nanofluids in a circular tube under constant wall temperature conditions was conducted, employing a single-phase model and three different two-phase models (volume of fluid (VOF), mixture and Eulerian).
Abstract: A computational fluid dynamics (CFD) simulation of laminar convection of Al2O3–water bio-nanofluids in a circular tube under constant wall temperature conditions was conducted, employing a single-phase model and three different two-phase models (volume of fluid (VOF), mixture and Eulerian). The steady-state, three-dimensional flow conservation equations were discretised using the finite volume method (FVM). Several parameters such as temperature, flow field, skin friction and heat transfer coefficient were computed. The computations showed that CFD predictions with the three different two-phase models are essentially the same. The CFD simulations also demonstrated that single-phase and two-phase models yield the same results for fluid flow but different results for thermal fields. The two-phase models, however, achieved better correlation with experimental measurements. The simulations further showed that heat transfer coefficient distinctly increases with increasing nanofluid particle concentration. The physical properties of the base fluid were considered to be temperature-dependent, while those of the solid particles were constant. Grid independence tests were also included. The simulations have applications in novel biomedical flow processing systems.
77 citations
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TL;DR: In this article, a numerical model for the complete thermo-fluid-dynamic and phase-change transport processes of two-component hydrocarbon liquid droplets consisting of n-heptane, n-decane and mixture of the two in various compositions is presented and validated against experimental data.
76 citations