Index Catalog // ScholarsArchive@OSU

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:: [JFM, 1999], and good agreement is obtained with the experimental data for bubble settling location in

Temperature Evolution of Spark Kernels in Quiescent and Cross-flow Conditions

Creator:: Okhovat, Sebastian
Abstract:: Numerous physical and chemical processes are required for successful ignition of a flammable mixture, many of which have been well characterized. However, one aspect of the ignition process that has received limited consideration is understanding the temperature of the spark kernel. A spark kernel is the volume of heated gas...
Resource Type:: Masters Thesis

Assessing Mass Diffusion Modeling in Premixed Flames

Creator:: Fillo, Aaron J.
Abstract:: Implementing multicomponent diffusion in numerical combustion studies is computationally expensive due to the challenges involved in computing diffusion coefficients. As a result, mixture-averaged diffusion treatments or simpler methods are used to avoid these costs. However, the accuracy and appropriateness of the mixture-averaged diffusion model has not been verified for three-dimensional...
Resource Type:: Dissertation

DNS study of Particle-bed-Turbulence Interactions in Oscillatory Flows

Creator:: Ghodke, Chaitanya Deepak
Abstract:: Turbulent flows over rough surfaces are encountered in many engineering and geophysical applications. Flows of this nature, due to their increasing technological interests, have been a subject of rigorous investigation in recent years. Of the particular interest to the oceanographic community is the study of turbulent oscillatory flow over rough...
Resource Type:: Dissertation
Full Text:: Fluid Mechanics, Vol. 792, 2016. doi:10.1017/jfm.2016.85 • Ghodke, C. D., and Apte, S. V.,“Spatio

Design Optimization of a Structurally Flexible Wave Energy Converter with a Direct Search Algorithm

Creator:: Berrier, Austin S.
Abstract:: Several wave energy converter designs have been recently proposed that are made of flexible materials. Flexible devices are able to generate electricity by being stretched, and are intended to simplify deployment and maintenance concerns over existing wave energy devices. Due to the relative infancy of flexible wave energy converters, however,...
Resource Type:: Masters Thesis

Modelling Thin Liquid Film Draining of Bubbles on Porous Media in Confined Geometry

Creator:: Bahm, Jared S.
Abstract:: The behavior of the thin liquid ﬁlm formed between a bubble and hydrophobic membrane is of high interest in applications where separating two-phase mixtures is beneﬁcial. One such application is in-situ vapor extraction heat sinks. In these systems, high heat transfer rates are accomplished by taking advantage of the high...
Resource Type:: Masters Thesis

Data Mining a Design Repository for Automating and Validating Functional Modeling

Creator:: Mikes, Alex B.
Abstract:: The purpose of this work is to build a foundation of understanding and methodologies as the steps toward automating functional modeling. We have achieved significant progress in the automatic generation of functional representations, which can be connected at the interface of components to create a functional model. This work highlights...
Resource Type:: Masters Thesis

Additive Manufacturing of FeCrCoCuNi High Entropy Alloy via Laser Powder Bed Fusion and Nickel Aluminum Bronze via Laser Directed Energy Deposition

Creator:: Doyle, Ryan P.
Abstract:: High Entropy Alloys (HEA) exhibit unusual properties and are gaining interest as new materials for challenging applications in the aerospace, hypersonic and medical fields. The application of HEAs have been limited by the development of powder production at scale. A recently developed process of plasma spheroidization by 6K, inc. has...
Resource Type:: Masters Thesis
Full Text:: , The Superalloys Fundamentals and Applications, 2006. https://doi.org/10.1017/CBO9780511541285. [51

Effect of Laser Powder Bed Fusion Parameters and Hot Isostatic Pressing on the Microstructure and Mechanical Properties of C22 Alloy

Creator:: Yan, Dongqing
Abstract:: A nickel-based Hastelloy C22 powder with a nominal composition of Ni-21.30Cr-13.36Mo-1.92Co-2.94W-3.85Fe-0.23Mn-0.3V(wt%) and particle size distribution of D₁₀=23.8±0.3 μm, D₅₀=37.5±0.2μm, and D₉₀=59.3±1.1 μm was gas atomized to be used as a feedstock in Laser Powder Bed Fusion (LPBF). In this study, laser power and scanning speed were optimized to manufacture specimens...
Resource Type:: Masters Thesis
Full Text:: . References: [1] R.C. Reed, The Superalloys Fundamentals and Applications, 2006. https://doi.org/10.1017

Functional analysis to inform early design decisions for novel systems with substantial operations and maintenance costs

Creator:: Algarra, Nathan
Abstract:: Long field-life systems are those for which operational, as opposed to capital, expenditures dominate the life time cost of the system. In established product categories, operational experience and historical maintenance data allows engineers to make informed decisions influencing maintenance during the early design stages when design changes are at their...
Resource Type:: Masters Thesis

ScholarsArchive@OSU

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

Temperature Evolution of Spark Kernels in Quiescent and Cross-flow Conditions

Assessing Mass Diffusion Modeling in Premixed Flames

DNS study of Particle-bed-Turbulence Interactions in Oscillatory Flows

Design Optimization of a Structurally Flexible Wave Energy Converter with a Direct Search Algorithm

Modelling Thin Liquid Film Draining of Bubbles on Porous Media in Confined Geometry

Data Mining a Design Repository for Automating and Validating Functional Modeling

Additive Manufacturing of FeCrCoCuNi High Entropy Alloy via Laser Powder Bed Fusion and Nickel Aluminum Bronze via Laser Directed Energy Deposition

Effect of Laser Powder Bed Fusion Parameters and Hot Isostatic Pressing on the Microstructure and Mechanical Properties of C22 Alloy

Functional analysis to inform early design decisions for novel systems with substantial operations and maintenance costs

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