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  • Modeling and simulation of volume displacement effects in multiphase flow

    Creator:
    Cihonski, Andrew John
    Abstract:
    There are many options available when selecting a computational model for two-phase flows. It is important to understand all the features of the model selected, including when the model is appropriate and how using it may affect your results. This work examines how volume displacement effects in two-phase Eulerian-Lagrangian models...
    Resource Type:
    Dissertation
    Full Text:
    the vortex core center: strong vortex cases (a) db = 500 µm (case # 8), (c) db = 900 µm (case # 10

  • Modeling of Non-Spherical Particle Dynamics in a Non-Uniform Flow

    Creator:
    Alshehri, Ahmad S.
    Abstract:
    Turbulent flow with suspended, non-spherical particles can be found in nature and several industrial applications. Although turbulence with dispersed spherical particles has been studied extensively, modeling the dynamics of non-spherical particles in a turbulent flow has not been studied extensively. Motion of spherical particles in complex flows is typically captured...
    Resource Type:
    Masters Thesis
    Full Text:
    strain rate of a fluid element on a particle is the major difference between 8 isotropic and

  • Numerical Investigations on Sewer Geysers

    Creator:
    Choi, YunJi
    Abstract:
    A sewer geyser is a series of ejecting air-water mixture eruptions through vertical shafts of drainage systems. In field observed geyser incidents, manhole covers were blown into the air and they were followed by ejecting air-water mixture eruptions that lasted for several seconds at a time. Trapped air in sewer...
    Resource Type:
    Dissertation
    Full Text:
    degree of Doctor of Philosophy in Civil Engineering presented on March 8, 2018. Title: Numerical

  • A multiscale modeling approach for bubble-vortex interactions in hydro-propulsion systems

    Creator:
    Finn, Justin Richard
    Abstract:
    Multiphase flow dynamics are important in many naval and turbomachinery applications, where bubble interaction with low pressure, vortical structures can lead to undesirable cavitation effects. To better understand the underlying phenomena, a multiscale numerical framework is developed to simulate bubble laden flow in dynamic hydro propulsion systems. Several subproblems in...
    Resource Type:
    Masters Thesis
    Full Text:
    . . . . . . . . . . . . . . . . . . . . . . . . 8 2.2 Bubble-Vortex Interactions . . . . . . . . . . . . . . . . . . . . . . . 10 3 Mathematical

  • Investigation of volumetric coupling effects on particle-laden turbulent flows at dilute to moderate loadings

    Creator:
    Cihonski, Andrew John
    Abstract:
    Particle-laden turbulent flows are of great importance in many industrial applications and are sufficiently complex to require multiple methods of study to provide a better understanding of the dominant physical mechanisms present in these processes. This work on large-eddy simulation of particle-laden flows seeks to help provide the building blocks...
    Resource Type:
    Masters Thesis
    Full Text:
    . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.2 Flow Regimes and Coupling Methods . . . . . . . . . . . . . . . . . 12 2.2.1 One-Way Coupling

  • On the Euler-Lagrange Modeling of Particle-laden Turbulent Flows

    Creator:
    Pakseresht, Pedram
    Abstract:
    Particle-laden turbulent flows, wherein a large number of small size particles are dispersed in a fluid, are widely encountered in environmental and industrial applications. Understanding their underlying physics, making predictions without performing expensive experiments, and ultimately optimizing the systems carrying such flows, require accurate and robust modelling tools. The Euler-Lagrange...
    Resource Type:
    Dissertation
    Full Text:
    process modified based on Herrmann (2010b). . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.2

  • Numerical study of flow maldistribution in microchannels using fully resolved simulation

    Creator:
    Martin, Mathieu Georges Charles
    Abstract:
    This thesis addresses numerical simulation of flow maldistribution in microchannels. Microchannels are often associated with two phase-flows which can generate many problems such as plugging the channel or perturbing the flow. In this study we have used CFD and fully resolved technique to simulate what would happen in the case...
    Resource Type:
    Masters Thesis
    Full Text:
    . . . . . . . . . . . . . . . . . . . . . . . . 6 2.2 Bubble nucleation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.3 Flow control

  • Numerical simulation of cavitating bubble-laden turbulent flows

    Creator:
    Shams Sobhani, Ehsan
    Abstract:
    Many engineering devices and propulsion systems suffer from undesirable effects of cavitation; such as degradation in the efficiency of pumps and turbines, generation of noise and vibration on ship propeller, increased drag and erosion of propeller blade, etc. In spite of decades of research on this problem, detailed study of...
    Resource Type:
    Dissertation
    Full Text:
    bubble by liquid; F`→b = FG + FP + FD + FL + FAM + Fcoll + FṘb FAM added mass force on a bubble fb