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Showing 1 to 20 of 51 for “"Volume of fluid (VOF)"”.
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A Volume of Fluid (VoF) based all-mach HLLC Solver for Multi-Phase Compressible Flow with Surface-Tension
… 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: Compressive Interface Capturing …
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A Study of the Volume of Fluid Method for Moving Boundary Problems
<p>Moving boundary problems are often encountered 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 …
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Numerical Study of Turbulent Characteristics and Aeration Patterns in Breaking Surge Waves
… behind a breaking 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 …
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Optimal design and analysis for polymer extrusion and molding
… 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 numerical optimization. It is applicable to systems …
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Shape Optimization of Hydrofoils
… GA) is employed for shape optimization of hydrofoils for application in a sailing craft. The hydrofoil for a sailing craft should have high lift at lower speeds and low drag at higher speeds. Computations are performed for a hydrofoil in deep water as well as one close to the free …
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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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Computational Fluid Dynamics Modeling of Compact Steam Generators
… are essential. This thesis explores the use of Multiphase Computational Fluid Dynamics (M-CFD) to simulate two-phase flow boiling in CSGs based on Printed Circuit Heat Exchanger (PCHE) technology. Using the commercial CFD code STAR-CCM+, two modeling approaches—the Volume of Fluid (VOF) model …
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The experimental study and numerical simulation of falling liquid film flow on horizontal tubes
… No report has been found so far in studies of water falling film up to 100 mm intertube spacing. No simulation analysis of film thickness under influence of intertube spacing in 3 dimensional models. Therefore, to the best of author’s knowledge, this research aims to illuminate the effects …
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Inverse Volume-of-Fluid Meshless Method for Efficient Non-Destructive Thermographic Evaluation
… Collocation (LRC) 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 …
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Computation of moving interface flows in biophysical applications
… with the modeling, simulation, and analysis of moving interface problems involving viscous fluids and solid structures. The main computational technique employed in this work is the immersed boundary method, a widely known numerical method for fluid-structure interaction (FSI). In this …
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Evaluation of the Interaction Between Flow Turbulence and Corrosive Material Transport Around Bridge Piers
This study investigates the influence of corrosion on turbulent flow around bridge piers and its implications for structural integrity and environmental safety. By examining the interaction between flow turbulence and corrosion-induced particles, the research highlights their effects on vortex …
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Numerical Models for Scour and Liquefaction Around Object Under Currents and Waves
… is constructed. Free 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 …
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Modeling and Numerical Investigation of Hot Gas Defrost on a Finned Tube Evaporator Using Computational Fluid Dynamics
… accumulated on the evaporators after a period of running time. It is one way to improve the energy efficiency of refrigeration systems. There are many studies about the defrosting process but none of them use computational fluid dynamics (CFD) simulation. The purpose of this thesis is (1) to …
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Development of an Immersed Boundary Method for the Simulation of Moving Bodies at Fluid-fluid Interfaces
… in multiphase flows appear in many scenarios of industrial interest, including bitumen extraction, mineral recovery via froth flotation, soil remediation, and many others. This thesis presents the development of Immersed Boundary Methods (IBMs) coupled to a two-phase incompressible flow …
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The rise of Taylor bubbles in vertical and inclined pipes
Slug flow is one of the key flow regimes encountered in multiphase flow systems. Through reviewing the literature, the researcher identified a research gap in performing a theoretical treatment to the problem, specifically using the dimensionless treatment and the order of magnitude analysis of …
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A study on green water problem with dam break model and the BIV technique
… piecewise solution (PS). Numerically, 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 …
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The Effect of Wall Jet Flow on Local Scour Hole
… reports on investigations carried out to study of the effect of horizontal wall jets on rough, fixed and mobile beds in open channel flow. Experimental tests were carried out, using fixed and mobile sediment beds. Computer simulation models for the flow within the jet and resulting sediment …
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Direct numerical simulation of free-surface and interfacial flow using the VOF method: cavitating bubble clouds and phase change
Direct Numerical Simulation of two-phase ow is used extensively for engineering research and fundamental fluid physics studies. 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 …
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Argon bubble transport and capture in continuous casting with an external magnetic field using GPU-based large eddy simulations
Continuous casting produces over 95% of steel in the world today, hence even small improvements to this important industrial process can have large economic impact. In the continuous casting of steel process, argon gas is usually injected at the slide gate or stopper rod to prevent clogging, but …
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Enhancing Steel Cleanliness in Tundishes by applying Physical and Mathematical Modeling
… It has been noticed that reoxidation of liquid steel from ambient air aspiration through the ladle slide gate, can seriously degrade the steel quality. As a preventive measure, the reoxidation-prone region is flooded with an inert gas such as argon to prevent aspiration of air. …
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