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.
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Showing 1 to 18 of 18 for “"Multi-phase flows"”.
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Numerical Methods for Compressible Multi-phase flows with Surface Tension
… series of computation methods for compressible multi-phase flows with capillary effects based upon the full seven-equation Baer-Nunziato model. For that reason, there are some numerical methods to obtain high accuracy solutions, which will be shown here. First, a high resolution shock capturing …
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A Hybrid Dynamically Adaptive, Super-Spatio Temporal Resolution Digital Particle Image Velocimetry for Multi-Phase Flows
… with capability of resolving velocities in a multi-phase flow field, using a very sophisticated novel Dynamically Adaptive Hybrid velocity evaluation algorithm has been developed The unique methodology of this powerful system is presented, its specific distinctions are enlightened, confirming …
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Development and applications of two and three component particle image velocimetry techniques for simultaneous measurement in multi-phase flows and automative fuel sprays
… of a new imaging approach for simultaneous multi-phase and multi-constituent velocity measurements is the main focus of this research. The proposed approach is based on the use of a single off-the-shelf colour camera which will enable simultaneous imaging of phases/constituents which are …
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High-Order and Wavelet-Adaptive Immersed Methods for PDEs on Complex Domain Geometries
… to the numerical simulation of interface-coupled multi-physics problems, such as multi-phase flows and fluidstructure interactions. This renders necessitates the design of novel high-order and efficient solvers based on immersed methods. This thesis examines two pivotal aspects of these methods: …
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A space-time adaptive method for flows in oil reservoirs
… a space-time adaptive framework for simulating multi-phase flows through porous media, with specific applications to flows in oil reservoirs. A fully unstructured discretization of space and time is used instead of a conventional time-marching approach. For d-dimensional spatial problems, this …
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Nature-inspired systems exploiting porous media for multiphase flows
This thesis studies multi-phase flows within two different types of porous nature-inspired material systems: multi-layered feathers and synthetic trees. (1) How multilayered feathers enhance underwater superhydrophobicity. Inspired by ducks, here we demonstrate that air pockets can withstand up to …
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Investigation of Particle Trajectories for Wall Bounded Turbulent Two-Phase Flows
The analysis of turbulent flows provides a unique scientific challenge whose solution remains central to unraveling the fundamental nature of all fluid dynamics. Measuring and predicting turbulent flows becomes even more difficult when considering a two-phase flow, which is a commonly encountered …
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Modeling the flow of non-Newtonian fluids in packed beds at the pore scale
… modeling is required for certain non-linear flows, such as multi-phase flows, inertial flows, non-Newtonian flows, and reactive flows. Pore-scale modeling is a first-principles approach to modeling flow and transport in porous media. In this work, network models that are physically …
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A Study of Instability Mechanisms Driving Cloud Cavitation: Experimental Analysis Using New Advanced Velocimetry and Evaluation of Numerical Models
… in resolving flow within opaque, dense multiphase regions. This dissertation addresses these challenges by integrating advanced deep learning-based diagnostics with rigorous experimental characterization and computational fluid dynamics (CFD) to elucidate the physics of cloud shedding in …
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Instrumentation for low-conductivity magnetic induction tomography
… haemorrhagic cerebral stroke and the imaging of multi-phase flows in oil pipelines. The specification, design and performance of three novel low-conductivity MIT systems are described and are discussed in relation to the target applications. The Cardiff Mk1 single-frequency MIT system was only …
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Dynamics of deep-submarine explosive eruptions
… particle dispersal mechanisms of these complex multi-phase flows. In chapter 3 we explore the dynamics of particle-laden fountains in a stratified environment, and identify two distinct flow regimes as a function of the average size of the particles, in which the flow is controlled by the …
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Microchemical systems for understanding of multiphase flows in upstream hydrocarbon and natural gas productions
… of microchemical systems to understand multiphase flows in upstream hydrocarbon and natural gas productions. Offshore petroleum and natural gas catastrophes, such as the Deepwater Horizon spill of 2010, motivate the need to understand how to minimize the introduction of potentially …
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A variational framework for multi-scale defect modeling in strained electronics and processing of composite materials
… of the material processing stage and incorporate multi-physics coupling for multi-constituent materials. A stabilized and novel discontinuity capturing formulation is developed to model multi-phase flow of the materials and their defect while sharply capturing the jumps in material properties, …
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CFD modelling of pipe erosion under multiphase flow regimes.
… focuses on predicting erosion under complex multiphase flow conditions with emphasis on double bend geometries. The Eulerian Multifluid-VOF coupled with the Lagrangian Discrete Phase Model (DPM) has been employed to account for the flow and particle behaviour, RNG k - e model for the effects …
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Modeling transient multiphase flow and mold top surface behavior in steel continuous casting
… of computational models to investigate transient multiphase turbulent flow physics in the mold region and mold top surface behavior during continuous casting of steel slabs. Each model can be used independently or combined together as a comprehensive system to gain insights into the inter-related …
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NUMERICAL METHODS FOR MULTIPHASE FLOWS: FROM A SIMPLIFIED INCOMPRESSIBLE BAER-NUNZIATO MODEL TO A UNIFIED THEORY OF COMPRESSIBLE MULTIPHASE FLUID AND SOLID MECHANICS
… of modelling compressible and incompressible multi-phase flows and the design of suitable numerical algorithms for solving such models. Currently, there is no universally accepted mathematical model to describe two-phase flows, consequently the extension to multi-phase flows (with more than …
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AEROSOL EFFECTS IN HIGH SUPERSONIC FLOWS
… (5-20 μm), a Mach-4 facility, referred to as the Multi-phase Investigations Supersonic Tunnel (MIST) has been designed and developed at the University of Maryland (capable of producing supersonic, particle-laden flows). This range of aerosol sizes makes MIST a unique facility with significant …
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Compressible Lubrication Theory in Pressurized Gases
… material properties, non-newtonian fluids, multi-phase flows, wall slip, and thermal effects. The bulk of these studies have focused on highly viscous liquids, e.g., oils. In recent years there has been increasing interest in power systems using new working fluids, micro-turbines and …