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, a developed CFD-DEM model is presented to study the cuttings transportation in aerated mud drilling process for inclined annuli at downhole conditions, which is conducted to determine the effects of liquid flow rate, air injection rate, annulus inclination angle, elevated temperature and pressure on the cut-ings transport efficiency.
35 citations
TL;DR: In this article, a comparative study of the influence of the initial and geometrical conditions on dam-break flow is presented, including the reservoir still water level, length and width as well as tail-water depth on dry and wet beds, respectively.
35 citations
TL;DR: This work represents the first successful application of a geometric VOF method coupled with a sharp-interface phase-change model and species transport to non-trivial problems, and represents an important step in the development of multiphase codes capable of accurately resolving complex three-dimensional multiphases flows.
35 citations
TL;DR: In this paper, the authors investigated the passage of a gas bubble at a plan liquid-liquid interface both experimentally by using a high-speed video camera and numerically through the volume-of-fluid approach.
Abstract: The present study aims at investigating the passage of a gas bubble at a plan liquid-liquid interface both experimentally by using a high-speed video camera and numerically through the volume-of-fluid (VOF) approach. A Newtonian silicone oil was used for the light phase while two different liquids, a Newtonian Emkarox (HV45) solution and a non-Newtonian poly(acryl amide) (PAAm) solution, were employed as the heavy phase. The passage of a gas bubble, generated from a submerged orifice, was followed during its rise in each liquid phase and in particular at the liquid-liquid interface. The original curve of the bubble's position vs time gave interesting insight into the dynamic behavior of the interface. Experimental results show the effect of the bubble size as well as the rheological properties of the heavy phase on the bubble's retention time at the liquid-liquid interface. The preliminary numerical results obtained by the VOF approach are in qualitative agreement with the experimental data.
35 citations
Dissertation•
01 Jan 2010TL;DR: OpenFOAM-1.7.x as discussed by the authors is a modified version of interFoam, which is able to generate and dissipate different wave types in the numerical wave tank.
Abstract: An open source CFD solver,OpenFOAMR, has been used to create a numerical wave tank. The study is based on the interFoam solver, i.e. a solver for incompressible multiphase flow problems. The solver uses the finite volume method for the spatial discretization of equations and applies the VOF approach for the free surface modeling.
Initially a convergence study was carried out. The study was based on the propagation of fifth order Stokes waves in deep water condition. To this end two separate applications, waveWriter and errorCalculator, were created. With the former the initial conditions for the velocities and pressure of fifth order Stokes wave can been specified directly for interFoam. The errorCalculator is a post-processing tool that estimate the computational
errors at each time step. The study revealed that the model exhibits only first order convergence. The loss of one order is due to the waveWriter setting only first order initial conditions.
Wave generation and absorption in the wave tank are performed by the relaxation method. For this purpose the existing interFoam solver has been partially modified in order for replacing the computational solutions with desired analytical ones inside the relaxation zones. In this manner the modified solver is able to generate and dissipate different wave types in the numerical wave tank. It is shown that outgoing waves are absorbed efficiently
by extending the damping relaxation zone to at least three wavelengths, while one wavelength extension is required for the wave-generating zone.
To validate the numerical wave tank, the Whalin shoaling test was considered. Unfortunately, inadequacies in the then existing version of interFoam, (version 1.6.x), in the
handling of the pressure force balance on non-orthogonal and distorted meshes, hindered and finally stopped the validation test process. Subsequently it was found that the newer version OpenFOAM-1.7.x, can be used promisingly for the validation of wave tank by Whalin test and this has been defined as a recommended future work.
Keywords: OpenFOAM, interFoam, NumericalWave Tank, Nonlinear waves, Free surface flow, Relaxation Method, Wave Generation and Absorption.
35 citations