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Showing 1 to 20 of 27 for “"VOF method"”.
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Finite Element Simulation of Interfacial Flows on Unstructured Meshes using a Second-order Accurate VOF Method
… incompressible flows, with a volume-of-fluid (VOF) technique for interface capturing. A new formulation of the pressure Poisson equation that requires the discretization of a second-order derivative is used for the flow field on a fixed Eulerian grid. This approach enables us, in particular, to …
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Direct numerical simulation of free-surface and interfacial flow using the VOF method: cavitating bubble clouds and phase change
… This study is based on the Volume-Of-Fluid (VOF) method, originally created by Hirt and Nicols. This method has gained increased popularity, especially when geometric advection techniques are used coupled with a planar reconstruction of the interface. The focus of the first part of this work …
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A Study of the Volume of Fluid Method for Moving Boundary Problems
… in engineering and science. One of the methods to solve such problems numerically is the volume of fluid (VOF) method. The VOF method uses an additional field variable/to track the interface using the Eulerian fixed grid. In this work, the VOF method is combined with the Continuum …
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Assessment of Multi-Phase-CFD Frameworks for High Void Fraction Flow in Large Diameter Systems
… large structures using interface capturing methods while modeling dispersed structures with mixture approaches adding slip correlations or the Eulerian framework. Beyond simply bubbly flows, these hybrid formulations and multiphase frameworks remain widely untested, particularly for large …
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Direct numerical simulation of droplet-laden isotropic turbulence
… we develop and couple a new pressure-correction method with the volume-of-fluid (VoF) method for simulating incompressible two-fluid flows. The method's main advantage is that the variable coefficient Poisson equation that arises in solving the incompressible Navier-Stokes equations for two-fluid …
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Free surface flow and application to the filling and solidification of liquid metals into vessels of arbitrary shape
… approach used by the well known Volume Of Fluid (VOF) method. However, the SEA technique deals with both air and liquid explicitly, whereas the VOF method does not. A technique has also been developed to allow the liquid temperature to be determined from a conserved `mixture' enthalpy. The liquid …
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An Algebraic Volume of Fluid Method for Strongly Coupled Spacecraft Fuel Slosh Modelling
… structure of a spacecraft. The Volume of Fluid (VoF) method provides a framework in which Computational Fluid Dynamics (CFD) can be used to model the fluid dynamics of two phase fuel slosh in a mass conservative manner. To be applicable to industrial geometries, an unstructured finite volume …
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High performance computing for multiphase fluid flows
… Dynamics (CFD). A modified Volume of Fluid (VOF) method for modelling two phase flows is implemented using an analytic relation for its reconstruction step. The Finite Volume Method (FVM) is utilized, by incorporating a staggered grid, to discretize the two-dimensional (2-D) N-S equations. A …
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Numerical Study of Turbulent Characteristics and Aeration Patterns in Breaking Surge Waves
… surge wave. A combination of Volume of Fluid (VOF) method and Large Eddy Simulation (LES) is utilized for Froude numbers ranging from 1.71 to 2.49. Computational mesh is refined sufficiently to improve the LES quality by resolving at least 90% of the total Turbulent Kinetic Energy (TKE). At …
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Optimal design and analysis for polymer extrusion and molding
A manufacturing process design methodology is presented which can be used to improve the production of polymer components manufactured via the extrusion, injection molding, and compression molding processes. The design methodology employs polymer process modeling, design sensitivity analysis, and …
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Shape Optimization of Hydrofoils
… geometry and mesh generation. Volume of Fluid: VOF) method in FLUENT is employed to define the air/water interface. Genetic algorithm is implemented with GAMBIT and FLUENT for shape optimization of hydrofoils. Maximization of lift to drag ratio is used as the optimization criteria. Optimized …
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Direct computations of marangoni driven flows using a volume of fluid method
The volume of fluid (VoF) interface tracking methods have been used for simulating a wide range of interfacial flows. An improved accuracy of the surface tension force computation has enabled the VoF method to become widely used for simulating flows driven by the surface tension force. A general …
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A Volume of Fluid (VoF) based all-mach HLLC Solver for Multi-Phase Compressible Flow with Surface-Tension
This work presents an all-Mach method for two-phase inviscid flow in the presence of surface tension. A modified version of the Hartens, Lax, Leer and Contact (HLLC) approximate Riemann solver based on Garrick et al. [1] is developed and combined with the popular Volume of Fluid (VoF) method: …
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Development and application of Lattice Boltzmann and accurate volume of fluid numerical techniques on graphics processing units
… two variants of two-phase Lattice Boltzmann methods (LBM) namely the Shan and Chen (SC) and He and Chen (HC) and applied them to study various flows including droplet impingement on solid and liquid surfaces, head-on and oblique droplet collisions, droplet deformation in a square duct, and …
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Computation of moving interface flows in biophysical applications
… employed in this work is the immersed boundary method, a widely known numerical method for fluid-structure interaction (FSI). In this technique, the fluid equations are solved in an Eulerian grid and the structure is treated as a network of Lagrangian nodes. The communication between the fluid …
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Numerical Models for Scour and Liquefaction Around Object Under Currents and Waves
… water surface is modeled by volume of fluid (VOF) method and water waves are generated by numerical wave-maker boundary condition. An iterative numerical scheme is proposed to solve the Biot consolidation equation using a finite volume method (FVM). The coupling between water wave and sea bed …
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Numerical simulation and modeling of two-phase flows using the volume-of-fluid method
… study of multiphase flows possible, numerical methods have been developed over the past seventy years to provide physical insight into areas where experiments and models are not feasible. The volume-of-fluid (VOF) method is a numerical interface-capturing method used to track a material …
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Development of an Immersed Boundary Method for the Simulation of Moving Bodies at Fluid-fluid Interfaces
… presents the development of Immersed Boundary Methods (IBMs) coupled to a two-phase incompressible flow solver. The phases are treated as immiscible, and are modelled using the Volume-of-Fluid (VOF) method. The methods developed to include the effects of surface tension and contact lines are …
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A study on green water problem with dam break model and the BIV technique
… the two fluid model with the Volume of Fluid (VOF) method implemented in the interFoam solver is used to simulate the dam break wave. The interFoam solves the RANS equations with a k − ε turbulence model. Experimentally, different dam break cases are carried out including one horizontal bed and …
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Enhancing Steel Cleanliness in Tundishes by applying Physical and Mathematical Modeling
… system was performed using the Volume of Fluid (VOF) method, and discrete phase method (DPM), coupled with the standard k-ε turbulence model. The mathematical model was validated with the experimental results from physical modeling and plant trials. A mechanism of formation of the TOEs and …
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