Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 75 for “"VOF"”.
-
VOF Based Multiphase Lattice Boltzmann Method Using Explicit Kinematic Boundary Conditons at the Interface
A VOF based multiphase Lattice Boltzmann method that explicitly prescribes kinematic boundary conditions at the interface is developed. The advantage of the method is the direct control over the surface tension value. The details of the numerical method are presented. The Saffman instability, …
-
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 …
-
A Volume of Fluid (VoF) based all-mach HLLC Solver for Multi-Phase Compressible Flow with Surface-Tension
… and combined with the popular Volume of Fluid (VoF) method: Compressive Interface Capturing Scheme for Arbitrary Meshes (CICSAM). This novel combination yields a scheme with both HLLC shock capturing as well as accurate liquid-gas interface tracking characteristics. To ensure compatibility with …
-
A Higher-Order VOF Interface Reconstruction Scheme for Non-Orthogonal Structured Grids - with Application to Surface Tension Modelling
The volume-of-fluid (VOF) method [24] is widely used to track the interface for the purpose of simulating liquid-gas interfacial flows numerically. The key strength of VOF is its mass conserving property. However, interface reconstruction is required when geometric properties such as curvature need …
-
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 …
-
A Study of the Volume of Fluid Method for Moving Boundary Problems
… 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 surface force model. The governing flow equations for Newtonian fluids in …
-
Inverse Volume-of-Fluid Meshless Method for Efficient Non-Destructive Thermographic Evaluation
… Meshless method coupled with a Volume-of-Fluid (VoF) scheme capable of accurately and efficiently solving transient multi-dimensional heat conduction problems in composite and heterogeneous media is formulated and implemented. While the LRC Meshless method lends its inherent advantages of …
-
Numerical simulation and modeling of two-phase flows using the volume-of-fluid method
… models are not feasible. The volume-of-fluid (VOF) method is a numerical interface-capturing method used to track a material interface in an Eulerian frame of reference. It is also one of the most widely used methods in the multiphase community due to its unique features such as mass …
-
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 …
-
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 …
-
Assessment of Multi-Phase-CFD Frameworks for High Void Fraction Flow in Large Diameter Systems
… In this work, the Volume of Fluid framework (VOF), a hybrid Mixture-Multiphase with Large-Scale Interface capturing (MMP-LSI) framework, and the Eulerian-Eulerian framework are validated against experiments performed at the TOPFLOW and HUSTLE facilities. These facilities resemble the two-phase …
-
Sensitivity Analysis of Turbulent Free-Surface Flows Applied to Optimal Casting Rigging Design
… prediction could be attributed to either the VOF algorithm or the turbulent mixing length model. The results show good agreement between the macroscopic features of the VOF model predictions and those of the experiment. Also, the mixing length model was shown to be appropriate for the types of …
-
Mathematical modeling of the fluid flow, multicomponent slag-metal reactions and desulfurization efficiency in gas-stirred ladles
… in the gas-stirred ladles. The volume of fluid (VOF) model, discrete phase model (DPM), and realizable k-ε model were applied to describe the argon/steel/slag/air multiphase evolution and the turbulent flow. The model was validated by comparing the simulation results with the experimental data …
-
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 …
-
A “Human Endeavor”: Killing In Contemporary U.S. Combat Narratives
… staggered grids. The volume-of-fluid (VOF) technique with SOLA-VOF advection scheme is used to capture the free surface motion. The developed model is tested using several experimental dam-break flows and the VOF technique is found to be able to effectively treat the rapidly-varying …
-
Parallel fluid dynamics for the film and animation industries
… the LBM in conjunction with a Volume of Fluid (VOF) surface representation in a parallel environment with the aim of producing large scale scenes for the film and animation industries. The VOF method tracks mass exchange between cells of the LBM. In particular, we implement the new dynamic load …
-
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 …
-
Evaluation Of Nozzle Geometry On High Pressure Gasoline Direct Injection Spray Atomization
… Volume-of-Fluid, Large-Eddy-Simulation, VOF-LES, method. Alternative nozzle geometries, that are the subject of current interest including varying nozzle hole length to diameter ratio, counter-bore presence and nozzle-hole skew-angle geometry, are studied in detail in order to provide …
-
CFD-DEM modelling of liquid-solid-gas flow in rotary drums and an application in solar panel leaching
… (CFD-DEM) coupled with the volume of fluid (VOF) to describe the complex behaviours of liquid-nonspherical-particle-gas flow. Then, it is particularly applied to the application of the silver leaching process in a rotary drum - a crucial step in the recycling of end-of-life crystalline …
-
Direct numerical simulation of droplet-laden isotropic turbulence
… 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 flows is reduced to a constant …
Page 1 of 4