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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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Journal ArticleDOI
TL;DR: In this paper, the characteristics of the primary breakup of a liquid jet are analyzed numerically using the Volumes of Fluids (VOF) approach utilizing the Direction Averaged Curvature (DAC) model, to estimate the interface curvature, and the Direction Average Normal (DAN) model to propagate the interface.

35 citations

Journal ArticleDOI
TL;DR: In this article, the influence of numerical advection algorithm properties on variational data assimilation results is investigated, and the results suggest application of the exact same scalar adveection algorithm in forward and adjoint computations in order to obtain, at lower cost, an optimal solution accuracy that is consistent with the forward model accuracy.
Abstract: The influence of numerical advection algorithm properties on variational data assimilation results are investigated. Nonlinear and linear advection algorithms are tested in a 2D idealized scalar advection framework in which the true solution was known. The accuracy of the optimal solutions after the data assimilation was positively correlated with the accuracy of numerical approximations used in both the forward and adjoint advection models. The accuracy of the optimal solutions was significantly smaller in the experiments in which linearized versions of the nonlinear advection algorithm were used. This property was the consequence of the optimization convergence to a local minimum in the cost function. The local minimum was avoided in the experiments in which the adjoint equation was solved by the original nonlinear advection algorithm. The results presented here suggest application of the exact same scalar advection algorithm in forward and adjoint computations in order to obtain, at lower cost, an optimal solution accuracy that is consistent with the forward model accuracy.

35 citations

Journal ArticleDOI
TL;DR: In this paper, the authors modeled heat and mass transfer in the absorber while accounting for the realistic drop-wise and wavy film flow patterns, and successfully modeled with full 3D spatial and temporal resolution using the Volume of Fluid technique.
Abstract: The absorber has the largest impact on the performance of an absorption heat pump. Most models of absorption heat and mass transfer in horizontal tube banks make simplistic assumptions about flow mechanisms. The flow over tube banks actually occurs as wavy films on the tube surface and as droplets in the inter-tube space. The formation and detachment of these droplets, and their impact on the tube affects heat and mass transfer considerably. Absorption models in the literature typically assume the solution to flow as a uniform film. The present study models heat and mass transfer in the absorber while accounting for the realistic drop-wise and wavy film flow patterns. The significant effects of mixing and the waves caused by droplet impact on heat and mass transfer are successfully modeled with full 3-D spatial and temporal resolution using the Volume of Fluid technique.

35 citations

Journal ArticleDOI
TL;DR: In this paper, a volume of fluid (VOF) technique was further developed and coupled with an incompressible Euler/Navier Stokes solver operating on adaptive, unstructured grids to simulate the interactions of extreme waves and a LNG carrier with full or partially filled tanks.
Abstract: A Volume of Fluid (VOF) technique has been further developed and coupled with an incompressible Euler/Navier Stokes solver operating on adaptive, unstructured grids to simulate the interactions of extreme waves and a LNG carrier with full or partially filled tanks. The present implementation follows the classic VOF implementation for the liquid-gas system, considering only the liquid phase. Extrapolation algorithms are used to obtain velocities and pressures in the gas region near the free surface. An arbitrary Lagrangian-Eulerian (ALE) frame of reference is used. The mesh is moved in such a way as to minimize the distortion of the mesh due to body movement. The incompressible Euler/Navier-Stokes equations are solved using projection schemes and a finite element method on unstructured grids, and the free surface is captured by the VOF method. The computer code developed based on the method described above is used in this study to simulate a numerical seakeeping tank, where the waves are generated by the sinusoidal excitation of a piston paddle, and a freely-floating LNG carrier with full or partially filled tanks moves in response to the waves. Both head sea and oblique sea are considered in the simulation. Highly nonlinear wave-body interactions, such as green water on deck and sloshing, have been modeled successfully.

35 citations

Journal ArticleDOI
TL;DR: In this paper, the effect of pitch angle on the impact characteristics of a transport airplane on the calm water is investigated by a subscaled model, where the Reynolds-averaged Navier-Stokes (RANS) equations of unsteady compressible flow are solved and the realizable κ - e equations are employed to model the turbulence.

35 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023315
2022655
2021352
2020345
2019341
2018323