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: In this paper, the authors simulate the motion of single gas bubbles in a liquid using the volume-of-fluid (VOF) technique, which allows them to describe the complex bubble dynamics using only the fluid phase properties as inputs.
Abstract: Understanding the motion of gas bubbles in a liquid is a problem of both scientific and engineering importance. About 500 years ago, Leonardo da Vinci1 summarized his observations on the motion of air bubbles in a liquid: “The air that submerged itself with the water returns to the air, penetrating the water in sinuous movement, changing its substance into a great number of forms it never spreads itself out from its path except to the extent to which it avoids the water which covers it”. We have attempted to simulate the motion of single gas bubbles in a liquid using the volume-of-fluid (VOF) technique, which allows us to describe the complex bubble dynamics using only the fluid phase properties as inputs.
70 citations
TL;DR: In this paper, a number of steady-state simulations of condensation of R134a inside a 1 mm i.d. circular minichannel at two far different mass flux values are proposed.
Abstract: A number of steady-state simulations of condensation of R134a inside a 1 mm i.d. circular minichannel at two far different mass flux values are proposed. The VOF method is used to track the vapour-liquid interface. The first simulations are run at G = 100 kg m − 2 s − 1 and G = 800 kg m − 2 s − 1 assuming that the channel displays horizontal orientation. The effects of interfacial shear stress, gravity and surface tension are all taken into account in this case and the results are validated by means of experimental data already available. As a further step, the same simulations have been run under normal gravity conditions but vertical downflow and finally assuming zero-gravity conditions. The condensation process is found to be gravity dominated at low mass flux, and thus very different results are obtained when neglecting gravity at this mass flux. An opposite result is achieved at high mass flux, as expected from the increased relative importance of interfacial shear stress in this case. The present results also allow to verify the influence of the surface tension effect during condensation in the circular cross section minichannel.
70 citations
TL;DR: In this paper, an improved height function technique for calculating the interface curvature from volume fractions in 3D volume fractions is presented, and a detailed analysis of the performance of the technique shows that appropriate discretization of the partial derivatives of the height function may considerably reduce the computed interface curvatures.
70 citations
TL;DR: The presented scheme, so-called THINC/QQ (THINC method with quadratic surface representation and Gaussian quadrature) scheme, shows significantly improved geometrical fidelity of interface representation particularly for curved surface, and is an accurate and efficient VOF scheme of great practical significance for unstructured grids.
70 citations
TL;DR: In this article, a large-eddy simulation (LES) approach for computation of incompressible multi-fluid flows is presented and applied to a turbulent bubbling process driven by the downward injection of air into a water pool at Re pipe ǫ ≥ 17,000.
70 citations