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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: In this article, a 2D numerical investigation of nucleate boiling by a comprehensive model which includes systematic methods for multiphase simulation, e.g., the smoothed evaporation model, modified height function algorithm and the micro-layer model is presented.
34 citations
TL;DR: In this paper, a numerical method based on the determination of the zero, first and second order moments of the concentration in each cell was shown, through various 2-dimensional numerical experiments, to suppress the spatial truncation error substantially.
Abstract: The advection of substances in a fluid computed with a finite grid resolution is known to smooth out concentration gradients. A numerical method based on the determination of the zero, first and second order moments of the concentration in each cell is shown, through various 2-dimensional numerical experiments, to suppress the spatial truncation error substantially. DOI: 10.1111/j.2153-3490.1974.tb01637.x
34 citations
TL;DR: In this paper, a computational exercise for co-current bubble-train flow in a square vertical mini-channel is performed to investigate the performance of well-known CFD codes for this type of flows.
Abstract: Computational fluid dynamics (CFD) codes that are able to describe in detail the dynamic evolution of the deformable interface in gas–liquid or liquid–liquid flows may be a valuable tool to explore the potential of multi-fluid flow in narrow channels for process intensification. In the present paper, a computational exercise for co-current bubble-train flow in a square vertical mini-channel is performed to investigate the performance of well-known CFD codes for this type of flows. The computations are based on the volume-of-fluid method (VOF) where the transport equation for the liquid volumetric fraction is solved either by the methods involving a geometrical reconstruction of the interface or by the methods that use higher-order difference schemes instead. The codes contributing to the present code-to-code comparison are an in-house code and the commercial CFD packages CFX, FLUENT and STAR-CD. Results are presented for two basic cases. In the first one, the flow is driven by buoyancy only, while in the second case the flow is additionally forced by an external pressure gradient. The results of the code-to-code comparison show that only the VOF method with interface reconstruction leads to physically sound and consistent results, whereas the use of difference schemes for the volume fraction equation shows some deficiencies. Copyright © 2007 John Wiley & Sons, Ltd.
34 citations
TL;DR: In this paper, an algorithm, Oxide Film Entrainment Tracking (OFET, 2-D), has been developed, tested and validated for numerical modelling of the liquid aluminium flow and movement, fold over and entrapment of oxide films during the mould filling process of aluminium castings.
Abstract: Recent advances in understanding the filling process during casting have indicated that metal flow conditions play a key role in controlling the quality of the casting. Inappropriate filling of castings usually causes surface oxide films to be folded into the bulk liquid or broken as a result of a higher liquid metal kinematic energy, resulting in so-called 'entrainment damage'. These folded oxide film defects are entrained in aluminium alloy casting and significantly affect both static and fatigue reliabilities. In the present study, an algorithm, Oxide Film Entrainment Tracking (OFET, 2-D), has been developed, tested and validated for numerical modelling of the liquid aluminium flow and movement, fold over and entrapment of oxide films during the mould filling process of aluminium castings. The Volume of Fluid (VOF) method is employed to track the free surface of liquid metal flow. A kinematic approach has been utilised for modelling the movement and entrainment of the oxide films on the liquid...
34 citations
TL;DR: In this article, the authors focus on the characteristics of wetting flows, in particular the drastic transition between the film flow and rivulet flow, as the liquid flow rate and the wall surface texture treatments are varied.
Abstract: Gas-liquid two-phase interfacial flows, such as the liquid film flows (also known as wetting flows on walls), are observed in many industrial processes including absorption, desorption, distillation, and so on. The present study focuses on the characteristics of wetting flows, in particular the drastic transition between the film flow and rivulet flow, as the liquid flow rate and the wall surface texture treatments are varied. The threedimensional gas-liquid two-phase interfacial flow (wetting flow) simulation is based on the volume of fluid (VOF) model. As the liquid flow rate is increased and then decreased, a hysteresis of the transition between the film flow and rivulet flow is discovered, which implies that the transition phenomenon depends primarily on the history of the change of interfacial surface shape (which affects the process of the flow pattern transition). The applicability and accuracy of the present numerical simulation is validated by using the existing experimental and theoretical studies. Further study on the effect of texture geometry shows that the surface texture treatments added on the wall can impede liquid channeling and increase the wetted area. [DOI: 10.1115/1.4004765]
34 citations