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  • Unique determination of acoustic properties from thermoacoustic data

    Creator:
    Hickmann, Kyle Scott
    Abstract:
    The extent to which thermoacoustic data determines the acoustic properties of an object was studied. In the case of one dimensional thermoacoustic imaging it was shown that constant acoustic profiles are uniquely specified from measurements. For a radial thermoacoustic problem we have shown that if the acoustic source is radial...
    Resource Type:
    Dissertation
    Full Text:
    AN ABSTRACT OF THE THESIS OF Kyle Scott Hickmann for the

  • Transmission Eigenvalues and Thermoacoustic Tomography

    Creator:
    Finch, David and Hickmann, Kyle S.
    Abstract:
    The spectrum of the interior transmission problem is related to the unique determination of the acoustic properties of a body in thermoacoustic imaging. Under a non-trapping hypothesis, we show that sparsity of the interior transmission spectrum implies a range separation condition for the thermoacoustic operator. In odd dimensions greater than...
    Resource Type:
    Article
    Full Text:
    Transmission Eigenvalues and Thermoacoustic Tomography David Finch ∗ Kyle S. Hickmann † June 23, 2013

  • Computational Investigation on the Effects of Arc Location in Vacuum Arc Remelting

    Creator:
    Soler, Miguel
    Abstract:
    Vacuum arc remelting (VAR) is a secondary melting process for exotic alloys. The main purpose of this process is to increase the input ingot’s physical and chemical homogeneity. This is accomplished through the application of a high current that melts the material through the emergence of electrical arcs that induce...
    Resource Type:
    Masters Thesis
    Full Text:
    : Computational Investigation on the Effects of Arc Location in Vacuum Arc Remelting Abstract approved: Kyle E

  • Evaluating Stiffness Metrics for Predicting the Cost of Chemical Kinetics Integration

    Creator:
    Alferman, Andrew Thomas
    Abstract:
    Simulations of combustion and reacting flows often encounter stiffness in the equations governing chemical kinetics. Explicit solvers for these ordinary differential equations offer low computational expense, but typically cannot efficiently handle stiff systems. In contrast, implicit methods demand greater expense but offer unconditional stability—as a result, most reactive-flow solvers rely...
    Resource Type:
    Masters Thesis
    Full Text:
    Stiffness Metrics for Predicting the Cost of Chemical Kinetics Integration Abstract approved: Kyle

  • Reducing Biogeochemical Models with an Automated Reduction Method

    Creator:
    Klee, Emily
    Abstract:
    Modeling elementary chemical reactions in ocean fluid dynamics simulations requires significant computing resources, which can be diminished with model reduction techniques. Submesoscale ocean turbulence and biogeochemical reactions in the ocean occur on approximately the same time scale, 105 seconds. This similarity in time scales indicates a strong coupling between these...
    Resource Type:
    Masters Thesis
    Full Text:
    Biogeochemical Models with an Automated Reduction Method Abstract approved: Kyle E. Niemeyer Modeling

  • Testing and design procedures for electric propellant pumps for suborbital bi-propellant rockets

    Creator:
    Verna-Ketel, Dominic
    Abstract:
    An electrically driven propellant pump (HALE E-Pump) was analysed and tested to determine its viability for use in a bi-propellant launch vehicle for the High-Altitude Liquid Engine (HALE) student rocket team at Oregon State University (OSU). The pump, manufactured in 2022 by students in OSU machine shops, was hydrostatically tested...
    Resource Type:
    Honors College Thesis
    Full Text:
    Suborbital Bi-propellant Rockets Abstract approved: Kyle Niemeyer An electrically driven propellant pump

  • Comparing the autoignition performance of chemical kinetic models for toluene using data extracted from the literature

    Creator:
    Mayer, Morgan
    Abstract:
    Real transportation fuels contain a wide range of hydrocarbon species, and this complexity poses challenges for modeling. Surrogates with a simpler blend of hydrocarbon reference fuels can approximate the physical and chemical characteristics of real fuels and enable practical simulation of the reacting flows that occur in engines and combustors....
    Resource Type:
    Honors College Thesis
    Full Text:
    : Kyle Niemeyer Real transportation fuels contain a wide range of hydrocarbon species, and this

  • Swept time-space domain decomposition on GPUs and heterogeneous computing systems

    Creator:
    Magee, Daniel J.
    Abstract:
    Modern scientific and engineering problems often require simulations with a level of resolution difficult to achieve in reasonable amounts of time—even in effectively parallelized programs. Therefore, applications that exploit high performance computing (HPC) systems have become invaluable in academia and industry over the past two decades. Addressing the questions that...
    Resource Type:
    Masters Thesis
    Full Text:
    -space domain decomposition on GPUs and heterogeneous computing systems Abstract approved: Kyle

  • GPU-Based Fluid-Structure Interaction using Immersed Boundary Methods

    Creator:
    Minar, Christopher
    Abstract:
    Engineering applications often require fast, accurate solutions of fluid flow around freely moving bodies. The massive parallelism enabled by graphics processing unit (GPU) architecture enables high performance, offering a promising alternative to traditional solver acceleration via multicore central processing units (CPU). However, fully harnessing GPU parallelism requires specialized algorithms and...
    Resource Type:
    Masters Thesis
    Full Text:
    Fluid-Structure Interaction using Immersed Boundary Methods Abstract approved: Kyle Niemeyer

  • Generalized Preconditioning to Accelerate Simulations with Large Multiphase Chemical Kinetics Models

    Creator:
    Walker, Anthony S.
    Abstract:
    Combustion emissions produced from burning real transportation fuels have many environmental impacts. However, detailed chemistry across multiple phases, time scales, and thermodynamic conditions make predicting combustion emissions challenging. Detailed modeling of the gas phase alone is prohibitively expensive, due to the large size and stiffness of the kinetic models. The...
    Resource Type:
    Dissertation
    Full Text:
    accelerating simulations with large kinetic models Anthony S. Walker, Raymond L. Speth, & Kyle E. Niemeyer My